Copolymer terpolymer

This three-component copolymer (terpolymer) (EPDM) contains about 15 double bonds per 1000 carbon atoms in the polymer. This provides enough reactive sites for low-density cross-linking, but unlike Hevea rubber (polyi-soprene), which contains about 200 double bonds per 1000 carbon atoms, EPDM is resistant to ozone. EPDM is used for the sidewalls of tires and for rubber hose but develops too much heat during flexing to be used for heavy-duty tire treads. 

The effect of the microstructure of acrylic copolymer/terpolymer on the properties of silica-based nanocomposites prepared by the sol-gel technique using TEOS has been further studied by Patel et al. [144]. The composites demonstrate superior tensile strength and tensile modulus with increasing proportion of TEOS up to a certain level. At a particular TEOS concentration, the tensile properties improve with increasing hydrophilicity of the polymer matrix and acrylic acid modification. 

There are a number of grades of fluorocarbon rubber (copolymers, terpolymers and tetrapolymers) and they are mainly used in applications where the temperatures would degrade ethylene-propylene rubber products. They are able to withstand prolonged use at temperatures up to 200 °C. Typical conditions are high temperature (<150 °C) gaskets under flow or static conditions, in contact with aqueous or fatty foods (including oils). 

Ether, a solvent with a low dielectric constant, favours cyclization over chain extension. Heating the phosphorane to 120 °C yields the alternating copolymer. Terpolymers are formed when either acrylates or acrylonitrile are copolymerized with dioxaphospholane in a carbon dioxide atmosphere. 

During the course of these studies, a large number of copolymer, terpolymer, and latex samples containing chemically bound biocides were given to the Mildew Steering Committee. 

Thennoplastics are heat softening materials which can be repeatedly heated, made mobile and then reset to a solid state by cooling. Under conditions of fabrication these materials can be moulded (shaped in a mould) by temperature and pressure. Examples of thermoplastics are more numerous than thermosets, e.g. polyethylene, polyvinylchloride, polystyrene, polypropylene, nylon, polyester, polyvinylidene chloride, polycarbonate. Thermoplastics may be further divided into homopolymers which involve one type of monomer, e.g. ethylene polymerised to polyethylene, and copolymers, terpolymers, etc., which involve two or more monomers of different chemical substances. Polymerisation producing thermoplastics and thermoset materials usually follows two basic chemical mechanisms, i.e. condensation and addition polymerisation. 

This standard is for polymers, blends of polymers, copolymers, terpolymers and alloys. It considers plastic parts that have been produced under a material identity control system. Molders/fabricators are required not to employ such additives/flame retardants that would adversely affect critical material properties. A detailed discussion on national and international fire protection regulations and test methods for plastics is presented by Troitzsch [1983]. 

The terms copolymer, terpolymer, and quaterpolymer designate the number of base units integrated in the chain. The different monomer types may show statistically regular or irregular distribution. Plastics with longer sequences of a single monomer type in the chain are known as block (or segment) copolymers. 

ABS acrylonitrile-butadiene-styrene copolymer, Terpolymer styrene-acrylonitrile-maleic anhydride copolymer, and MA mole% of maleic anhydride in the terpolymer. 

Acrylonitrile-chlorinated polyethylene-styrene copolymer Elastomeric ethyl (or other) acrylate-ethylene copolymer Terpolymer from acrylonitrile, ethylene-propylene elastomer, and styrene... 

Polyamides and saturated polyesters can be toughened with ABS, ethylene-propylene copolymers/terpolymers or EPDM rubbers grafted with maleic anhydride to increase the dispersion and adhesion of the modifier. Styrene-butadiene copolymers are also effective. The notched Izod impact strength of polyamide 6-6 can be increased more than 20-fold by impact modifiers, whereas short glass fibres often reduce the impact strength, even though they increase the modulus. 

The incorporation of small amounts of MA or maleic acid into vinyl chloride-vinyl acetate copolymers substantially improves their stability and adhesion.The introduction of the anhydride group also significantly increases the viscosity of the copolymers. Terpolymers of this type, having a... 

Information on some selected copolymers/terpolymers are available in Table 1.6. 

The most important interpolymers (e.g., copolymers, terpolymer, etc.) are those made with tetrafluoroethylene (ethylene tetrafluoroethylene polymer, ETFE) and chlorotrifluoroethylene (ethylene chlorot-rifluoroethylene polymer, ECTFE). These two polymers are generally produced by suspension or emulsion polymerization methods. There is resemblance between the polymerization technology of ETFE and ECTFE. Indeed, some of the same patent art could be studied to learn about the technology. This section and the next one present the polymerization of ETFE (Sec. 5.7) and ECTFE (Sec. 5.8). 

Property Test Method Unit Standard Copolymers Terpolymer (Malar 600) Malar 902... 

There are, however, some miscible polyolefin blend systems. There is evidence of miscibility (sometimes limited) between various copolymers/terpolymers of ethylene with amorphous isotactic polypropylene [20 to 22]. These copolymers include ethylene-butene, ethylene-hexene and ethylene-octene copolymers ... 

Polymer molecules are classified as homopolymers, copolymers, terpolymers, etc, depending on the number of different kinds of monomers used in polymerization. Homopolymers are prepared with only one species of monomer, copolymers with two, and terpolymers with three. Repeat units makii up homopolymer. 

Roslaniec Z (1999) Block copolymers, terpolymers and poly(ether-ester-amide) blends, Polimery 44 483-491 (in Polish). 

Random copolymer Alternating copolymer Diblock copolymer Triblock copolymer Pentablock copolymer Terpolymer AABBBABBAAAB ABABABABABAB AAAABBBBBBB AAAABBBBBAAAA AAABBBBAAABBBBAAAA AABBCCCBBAABBCCCAAA... 

Molecular structure. We can ask, for example, whether the polymer molecule is linear or branched. Is it made up of identical monomer units (homopolymer) or a mixture of two or more monomer units (copolymer, terpolymer). The polymer molecules may exist as separate individual molecules or they may be covalently linked to a macroscopic network. 

By the number of monomers used in the final polymer homopolymer, copolymer, terpolymer, and so on... 

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