成人免费xx,国产又黄又湿又刺激不卡网站,成人性视频app菠萝网站,色天天天天

polymer

Polymer is the product made of the polymerization reaction of monomer. Molecule should have repetitive structural units. Polymer of low molecular weight is called as low polymer (or oligomer) such as trioxymethylene. Polymer of high-molecular weight, up to thousands or even millions is called as high polymer or high-molecule compound. There are two types of high polymers including natural products and artificially synthetic product. Natural polymer such as protein is the polymers of amino acids while the starch and cellulose are the polymers (polysaccharides) of cyclic polyhydroxy, also known as biopolymers. Most of them are biodegradable and may cause short-term water BOD increment. It can also cause decomposition to generate pollutants such as ammonia, hydrogen sulfide and methane under anaerobic conditions, but will not cause long-term environmental impact. There are many types of synthetic polymers with their products having wide application. Related products include polyvinyl chloride and polystyrene plastics, resins, polyester and rubber. They are non-biodegradable substance. Long-term existence in the environment can cause a huge amount of garbage waste, among which the plasticizer will be evaporated out to pollute the environment, affecting human health at the same time. The monomers of polymer are mostly derived from petroleum, many of which are toxic and harmful substances, such as vinyl chloride which is a carcinogen. Nowadays, people are developing various polymer-containing oxide, peroxide-containing compounds and carbonyl-containing compounds. The polymer, under the sunlight photolysis, will be converted to low molecular weight organic compounds and further become harmless bio-degradable substance without contaminating the environment.

High molecular polymer is a compound consisting of one or several major structural units connecting with each other by covalent bond, also known polymers, high-molecule compound, macromolecular compounds and the like. E.g., polyethylene [-CH2-CH2-] n, Nylon 6 [-NH (CH2) 5CO-] n, whose structural units are respectively-CH2-CH2-, -NH (CH2) 5CO- with the polymerization degree being n.

Because of the high molecular weight (usually 104 to 106), it displays a number of special properties, such as relatively refractory soluble, or insoluble; swelling before being dissolved; much higher solution viscosity than a solution of equal concentration of small molecules; it has great intermolecular forces with usually exhibiting as only viscous liquid or solid form, not able to subject to gasification; the solid has a certain mechanical strength and can be subject to snagging and drawing.

The polymer is consists of a lot of macromolecular polymer chains of varying lengths, this feature is called the polydispersity of the molecular weight. We can use the distribution of the molecule weight to describe its polydispersity. The commonly referred molecular weight of the polymer is the average molecular weight of the polymer. Depending on the different statistical averaging method, there is number average molecular weight [equal to the total mass of the polymer (in g unit) divided by the total amount of the contained molecules of various molecule weights to represent Mm], weight average molecular weight (equal to the sum of the multiply of the molecules of various molecule weight and their corresponding molecular weight, expressed in Mm) and so on. Mm / Mm is called as polydispersity index, used to measure the width of the molecular weight distribution. The greater, the polydispersity index, the wider the molecular weight distribution will be and the greater the degree of dispersion.

The properties of polymers are still largely determined by the shape of the molecular chain. Depending on the shape of the molecular chain, it can be divided into linear, ball-type, network type and body-type, several structures.

The atoms of the main chain in the linear-structure polymer are often arranged in the shape of a long chain and the main chain is connected with in more or less amount of branches of varying lengths. When the polymer of such structure is heated, they tend to be melted, but also be soluble in certain organic solvents, having the probability of forming a crystal and can be oriented artificially. As some small amounts of branched-chain contained in increases the molecular spacing, the structure becomes loose, thereby reducing mechanical strength but increasing the solubility and plasticity. Common polymers belonging to this type include polyethylene, polyvinyl chloride and rubber.

The main chain of the ball-shape-structure polymer is also in long chain shape but with a large number of branches surrounding the main chain, making the molecule become globular. Its strength and elasticity is as high as that of the linear structure with no significant melting point but with excellent solubility. Phenolic resins, urea-formaldehyde resin which are the intermediate of reactions both belong to such structures.

The main chain of the high polymer of network structure is also in long chain shape, but has the bonds cross-linked, forming mesh-shape. It does not undergo melting at high temperatures but can be softened to have plasticity; it is not dissolved in an organic solvent but can swell, i.e. vulcanized rubber belongs to such type of polymer.

The high polymer of body structure has the long-chain as the main chain, being formed through the crosslink with many other molecules in three-dimensional space. However, during the process of polymerization of monomers, it can also be gradually formed through stepwise cross-linking.

The polymer of body structure is hard and brittle and can neither be melted in the high temperature nor do have plasticity. It can’t be dissolved in an organic solvent. The final products of phenol, aldehyde amine, epoxy and polyester, etc. all belong to this structure.
We can make classification for the polymer from different perspectives. According to the property and purpose, it can be divided into chemical fiber, plastics, rubber, paint and adhesives; According to the name of the synthetic reaction, it can be divided into addition polymer (such as polyethylene, polypropylene, etc.), condensation polymers (such as polyesters, polyamides etc.), ring-opening polymer (e.g., polyether, etc.); according to the source, it can be divided into natural polymers (e.g. starch, cellulose, etc.), synthetic polymers (e.g. vinyl polymers, etc.), semi-synthetic polymers (e.g. acetic acid cellulose and so on); according to the elements of the main chain, it can be divide into carbon-chain polymer (the main chain is mainly composed of carbon atoms), hetero chain polymer (the main chain contains, in addition to carbon atoms, oxygen, nitrogen, sulfur and other hetero atoms as well), element-organic polymer (main chain mainly composed of boron, silicon, aluminum, oxygen, nitrogen, sulfur and phosphorus atoms, but side-chain consists of organic groups such as methyl, ethyl, etc.); according to the application functions, it can be divided into general polymer, functional polymer and so on.

The major index of the polymers include strength, hardness, heat resistance, corrosion resistance, abrasion resistance, solvent resistance, light transmittance, and air tightness as well as electrically insulating properties. Density of the polymer is small, being much smaller than that of steel of the same volume; some of them are conductive, magnetic, and some are high temperature resistant, low temperature resistant and radiation resistant; some have excellent air tightness, transparency and so on. It has been widely used in medical, electrical conductivity, heat resistance, construction, packaging materials, plastic and some other fields.
The method of producing a polymer include bulk polymerization (including melt polymerization, referring to that monomer undergoes polymerization upon the action of light, heat and radiation without other media), solution polymerization (polymerization of monomer, initiator dissolved in an appropriate solution), emulsion (under the action of emulsifier and agitation, have the monomer be dispersed in water to form emulsion liquid to have polymerization), suspended polymerization (under the action of stirring and a dispersing agent, a monomer is dispersed into monomer droplets for being suspended in water for polymerization), etc., according to different requirements, we can apply different polymerization methods.

Click on the specific product, view the latest prices of the products, information, serving information
Structure Chemical Name CAS MF
Dowex 1X8 chloride form Dowex 1X8 chloride form 69011-19-4 C31H39N
Polycaprolactone Polycaprolactone 24980-41-4 C6H10O2
2-?Propenoic acid, polymer with 2-?propenamide and sodium 2-?propenoate (1:1) 2-?Propenoic acid, polymer with 2-?propenamide and sodium 2-?propenoate (1:1) 62649-23-4 C9H12NNaO5
Polyacrylonitrile Polyacrylonitrile 25014-41-9 C3H3N
FLUORIDE ON AMBERLYST(R) A-26 FLUORIDE ON AMBERLYST(R) A-26 39339-85-0 C6H4CH2N(CH3)3F
ALKYLPHENOL DISULFIDE ALKYLPHENOL DISULFIDE 25085-50-1 (C10H14O.CH2O)x
POLYBUTADIENE DIACRYLATE POLYBUTADIENE DIACRYLATE 9003-17-2 C4H6
Poly(caprolactone) diol Poly(caprolactone) diol 36890-68-3 (C6H10O2·C4H10O3)x
RESIN RESIN C6H8N3O2R
POLYSTYRENE A NH2 POLYSTYRENE A NH2
POLY(1-VINYLPYRROLIDONE-CO-2-DIMETHYLAMINOETHYL METHACRYLATE) POLY(1-VINYLPYRROLIDONE-CO-2-DIMETHYLAMINOETHYL METHACRYLATE) 30581-59-0 C14H24N2O3
POLYPHENYLMETHYLDIMETHYLSILOXANE POLYPHENYLMETHYLDIMETHYLSILOXANE 9005-12-3 C7H8OSi
Poly(hexamethylenebicyanoguanide-hexamethylenediamine) hydrochloride Poly(hexamethylenebicyanoguanide-hexamethylenediamine) hydrochloride 27083-27-8 C16H34N10
Polyethylene, Oxidized Polyethylene, Oxidized 68441-17-8 C51H102O21Si2
MERRIFIELD RESIN MERRIFIELD RESIN 9036-15-1 C19H19Cl
Carbonic dichloride, polymer with 4,4-(1-methylethylidene)bis2,6-dibromophenol and 4,4-(1-methylethylidene)bisphenol Carbonic dichloride, polymer with 4,4-(1-methylethylidene)bis2,6-dibromophenol and 4,4-(1-methylethylidene)bisphenol 32844-27-2 C31H28Br4Cl2O5
GUM MASTIC GUM MASTIC 61789-92-2
POLY(VINYLIDENE CHLORIDE-CO-ACRYLONITRILE) POLY(VINYLIDENE CHLORIDE-CO-ACRYLONITRILE) 9010-76-8 C5H5Cl2N
Poly(4-chlorostyrene) Poly(4-chlorostyrene) 24991-47-7 C8H7Cl
POLY(ALLYLAMINE) POLY(ALLYLAMINE) 30551-89-4 C3H7N
Poly(dicyclopentadiene-co-p-cresol) Poly(dicyclopentadiene-co-p-cresol) 68610-51-5 C10H12.C7H8O.C4H8
POLY(4-VINYLPYRIDINE) POLY(4-VINYLPYRIDINE) 25232-41-1 C7H7N
NYLON 6/66 NYLON 6/66 24993-04-2 C18H37N3O5
POLY(ALPHA-METHYLSTYRENE) POLY(ALPHA-METHYLSTYRENE) 25014-31-7 C27H30X2
POLYPROPYLENE-GRAFT-MALEIC ANHYDRIDE, AV ERAGE MW CA. 9,100 POLYPROPYLENE-GRAFT-MALEIC ANHYDRIDE, AV ERAGE MW CA. 9,100 25722-45-6 C7H8O3
Heat stabilizer for PVC Heat stabilizer for PVC
P-BROMOSTYRENE RESIN P-BROMOSTYRENE RESIN 24936-50-3 C8H7Br
Hydroxyl-Modified Vinyl Resin CoPolyMers Hydroxyl-Modified Vinyl Resin CoPolyMers
Anti-corrosion coating Anti-corrosion coating
Chelex 100 sodiumA Chelex 100 sodiumA
ACRYLONITRILE/BUTADIENE COPOLYMER ACRYLONITRILE/BUTADIENE COPOLYMER 68891-50-9 C21H27N3X2
Dowex Marathon C, H+ form Dowex Marathon C, H+ form
POLY(VINYLTOLUENE) POLY(VINYLTOLUENE) 9017-21-4 C9H10
POLY(N-ISOPROPYL ACRYLAMIDE) POLY(N-ISOPROPYL ACRYLAMIDE) 25189-55-3 C6H11NO
macroporous Merrifield macroporous Merrifield
POLYETHYLENE MONOALCOHOL POLYETHYLENE MONOALCOHOL 71750-71-5 CH3(CH2CH2)nCH2OH
POLY(ETHYLENE-CO-ACRYLIC ACID), ZINC SALT POLY(ETHYLENE-CO-ACRYLIC ACID), ZINC SALT 28208-80-2 C5H8O2
Terpene resin Terpene resin 9003-74-1
1-PROPOXY-2-PROPANOL 1-PROPOXY-2-PROPANOL 1569-01-3 C6H14O2
POLY(2-ETHYL-2-OXAZOLINE) POLY(2-ETHYL-2-OXAZOLINE) 25805-17-8 C5H9NO
GALDEN (TM) HT70 GALDEN (TM) HT70 69991-67-9 [CF(CF3)CF2O]x(CF2O)y
Oxidized polyethylene wax Oxidized polyethylene wax
AMBERJET 4400 OH STRONGLY BASIC ANION EXCHANGER AMBERJET 4400 OH STRONGLY BASIC ANION EXCHANGER 9017-79-2 (C12H18N?C10H10?HO)x
POLYPROPYLENE, CHLORINATED POLYPROPYLENE, CHLORINATED 68442-33-1 C8H15Cl
Phenolic epoxy resin Phenolic epoxy resin 61788-97-4 C21H23ClFNO2
POLYSULFONE POLYSULFONE 25135-51-7 C81H66O12S3X2
Urea formaldehyde Urea formaldehyde 9011-05-6 C2H6N2O2
ETHYLENEDIAMINE TETRAKIS(PROPOXYLATE-BLOCK-ETHOXYLATE) TETROL ETHYLENEDIAMINE TETRAKIS(PROPOXYLATE-BLOCK-ETHOXYLATE) TETROL 11111-34-5 C22H14
Acrylates copolymer Acrylates copolymer 25133-97-5 C14H22O6
AMBERLITE(R) IRC-50 AMBERLITE(R) IRC-50 9002-29-3 C23H37Cl2N3O
CUCURBITURIL CUCURBITURIL 80262-44-8 C36H36N24O12
Poly(ethylene glycol-ran-propylene glycol) monobutyl ether Poly(ethylene glycol-ran-propylene glycol) monobutyl ether 9038-95-3 C9H20O3
DOWEX(R) 1X8 DOWEX(R) 1X8 60267-37-0 C29H34ClN
Perfluoroalkylethyl acrylate Perfluoroalkylethyl acrylate 65605-70-1 C6H7F3O2
Tristyrylphenol ethoxylates Tristyrylphenol ethoxylates 99734-09-5 C30H24O.(C2H4O)n
POLY(STYRENE-CO-MALEIC ACID), PARTIAL ISOOCTYL ESTER, CUMENE TERMINATED POLY(STYRENE-CO-MALEIC ACID), PARTIAL ISOOCTYL ESTER, CUMENE TERMINATED 160611-46-1
POLY(1,4-BUTYLENE ADIPATE) POLY(1,4-BUTYLENE ADIPATE) 25103-87-1 C10H20O6
CHITOSAN OLIGOSACCHARIDE LACTATE CHITOSAN OLIGOSACCHARIDE LACTATE 148411-57-8 C12H24N2O9
FLUOROLUBE GREASE, GR-362 FLUOROLUBE GREASE, GR-362 9002-83-9 C2ClF3
NYLON 11 NYLON 11 25035-04-5 C33H63N3O3X2
ZINC RESINATE ZINC RESINATE 9010-69-9 C40H58O4Zn
POLY(METHYL METHACRYLATE-CO-BUTYL METHACRYLATE) POLY(METHYL METHACRYLATE-CO-BUTYL METHACRYLATE) 25608-33-7 C13H22O4
Glycerin Rosin Ester Glycerin Rosin Ester 8050-31-5 C23H36O4
Syringaresil diacetate Syringaresil diacetate 1990-77-8 C26H30O10
BT-S1050 BT-S1050
Macroporous resin D101 Macroporous resin D101
Methyl MQ silicone resin Methyl MQ silicone resin
POLY(VINYL CHLORIDE-CO-VINYL ACETATE) POLY(VINYL CHLORIDE-CO-VINYL ACETATE) 9003-22-9 C6H9ClO2
POLY(VINYLIDENE CHLORIDE-CO-METHYL ACRYLATE) POLY(VINYLIDENE CHLORIDE-CO-METHYL ACRYLATE) 25038-72-6 C6H8Cl2O2
ETHYLENEDIAMINE TETRAKIS(ETHOXYLATE-BLOCK-PROPOXYLATE) TETROL ETHYLENEDIAMINE TETRAKIS(ETHOXYLATE-BLOCK-PROPOXYLATE) TETROL 26316-40-5 C34H72N2O12
Poly(ethyl vinyl ether) Poly(ethyl vinyl ether) 25104-37-4 C4H8O
2,4,6-TRIS[BIS(METHOXYMETHYL)AMINO]-1,3,5-TRIAZINE 2,4,6-TRIS[BIS(METHOXYMETHYL)AMINO]-1,3,5-TRIAZINE 68002-20-0 C4H8N6O
Polychloroprene Polychloroprene 9010-98-4 C4H5Cl
METHYL VINYL ETHER-MONOBUTYL MALEATE COPOLYMER METHYL VINYL ETHER-MONOBUTYL MALEATE COPOLYMER 25119-68-0 C11H18O5
Polyisoprene-graft-maleic anhydride Polyisoprene-graft-maleic anhydride 139948-75-7 C14H18O3
POLYSTYRENE-BLOCK-POLYISOPRENE-BLOCK-POLYSTYRENE POLYSTYRENE-BLOCK-POLYISOPRENE-BLOCK-POLYSTYRENE 25038-32-8 C13H16
POLY(VINYLTOLUENE-CO-ALPHA-METHYLSTYRENE) POLY(VINYLTOLUENE-CO-ALPHA-METHYLSTYRENE) 9017-27-0 [CH2CH(C6H4CH3)]x[CH2C(CH3)(C6H5)]y
ACRYLONITRILE-METHYL ACRYLATE COPOLYMER ACRYLONITRILE-METHYL ACRYLATE COPOLYMER 24968-79-4 C7H9NO2
MERCAPTOMETHYL POLYSTYRENE MERCAPTOMETHYL POLYSTYRENE
AMBERLITE(R) IRA-67 AMBERLITE(R) IRA-67 80747-90-6
STYRENE MALEIC ANHYDRIDE COPOLYMER STYRENE MALEIC ANHYDRIDE COPOLYMER 26762-29-8 C21H22O3
POLY(ETHYLENE) POLY(ETHYLENE) 68037-39-8 C2H4
DOWEX(R) 1X8 DOWEX(R) 1X8 69772-06-1
Poly(styrene-co-acrylonitrile) Poly(styrene-co-acrylonitrile) 9003-54-7 C33H33N3X2
POLYISOPRENE, CHLORINATED POLYISOPRENE, CHLORINATED 68441-58-7 [CR2CR=C(CR3)CR2]n,R=HorCl
Propoxylate neopentylene glycol diacrylate Propoxylate neopentylene glycol diacrylate 84170-74-1 [H2C=CHCO2(C3H6O)nCH2]2C(CH3)2
PHENOXY RESIN PHENOXY RESIN 26402-79-9 (C18H20O3)n
MONO-METHYL POLYETHYLENE GLYCOL 20'000 2-(SUCCINYL-AMINO)ETHYL ETHER MONO-METHYL POLYETHYLENE GLYCOL 20'000 2-(SUCCINYL-AMINO)ETHYL ETHER 92450-99-2 C11H23NO7
Potassium polyacrylate Potassium polyacrylate 25608-12-2 C3H4O2
N-VINYLPYRROLIDONE/STYRENE COPOLYMER N-VINYLPYRROLIDONE/STYRENE COPOLYMER 25086-29-7 C14H17NO
DOWEX MAC-3 ION EXCHANGE RESIN DOWEX MAC-3 ION EXCHANGE RESIN 9052-45-3 C13H14O2
CUCURBIT(7)URIL CUCURBIT(7)URIL 259886-50-5 C42H42N28O14
DIAION HP-2MG, 100GM DIAION HP-2MG, 100GM
DOWEX(R) 50WX4 HYDROGEN FORM DOWEX(R) 50WX4 HYDROGEN FORM 69011-20-7 (C10H12·C10H10·C8H8)x
CARBOXYPOLYSTYRENE RESIN CARBOXYPOLYSTYRENE RESIN 120246-33-5 N/A
POLYACENAPHTHYLENE POLYACENAPHTHYLENE 25036-01-5 C12H8
Resin epoxy Resin epoxy 24969-06-0 C3H5ClO
Octyl-phenolic curing resin Octyl-phenolic curing resin
Thermoset acrylic resin Thermoset acrylic resin
Fatty acids, C18-unsatd., dimers, reaction products with polyethylenepolyamines Fatty acids, C18-unsatd., dimers, reaction products with polyethylenepolyamines 68410-23-1
HomePage | Member Companies | Advertising | Contact us | Previous WebSite | MSDS | CAS Index | CAS DataBase
Copyright © 2016 ChemicalBook All rights reserved.