ISOPHTHALIC ANHYDRIDE COPOLYMER

Lipoproteol UCO. See Sodium/TEA-undecenoyl collagen amino acids Lipopur . See Lecithin LipoquatR. See Ricinoleamidopropyl ethyidimonium ethosulfate Liporamnosan. See Hydroxyethylcellulose Liporez NEP-Special. See Trimethylpentanediol/isophthalic acid/trimellitic anhydride copolymer Liporol SP. See Guar (Cyanopsis tetragonoloba) gum Liposiliol C. See Dioleyl tocopheryl methylsilanol... 

Trimethylpentanediol/isophthalic acid/trimellitic anhydride copolymer... 

Trimethylpentanediol/isophthalic acid/trimellitic anhydride copolymer Trioctyidodecyl citrate 1,1,3-Trls (2-methyl-4-hydroxy-5-t-butylphenyl) butane Tromethamine acrylates/acrylonitrogens copolymer Urea-formaldehyde resin, butylated... 

Biodegradable copolymers of fumaric anhydride and isophthalic anhydride were synthesised by the melt condensation polymerisation of purified prepolymer mixtures and formulated into microspheres loaded with theophylline and diltiazem hydrochloride using a solvent extraction procedure. The important parameters of the microencapsulation process were identified and in vitro... 

Diallyl Isophthalate. DAIP polymerizes faster than DAP, undergoes less cyclization, and yields cured polymers of better heat resistance, eg, up to ca 200°C. Prepolymer molding materials such as Dapon M of EMC, are not sticky. Maleic anhydride accelerates polymerization, whereas vinyl isobutyl ether retards it and delays gelation in castings. Copolymers with maleic anhydride are exceptionally hard and tough and may scratch homopolymer surfaces. 

Table 9 lists two series of PEIs based on copolymers of precondensed units of trimellitic anhydride and m-aminophenol, reacted with varying molar fractions (20-100%) of 2-hydroxy naphthalene 6-carboxylic acid or 4-hydroxybenzoic acid. In both series an MI score of 10 corresponded to the onset of liquid crystallinity, and an isotropic copolymer was obtained for MI < 9.6. A series of PEIs is given in Table 25, in which varying ratios of N-carboxyphenyl trimellitimide and isophthalic acid are co-reacted with phenylhydroquinone [82]. The MI values vary by only 0.1 units between compositions and more accurately pinpoint the transition between the mesogenic and isotropic state to the range 9.5-9.6. 

Homo and copolyanhydrides were synthesized in an aqueous and nonaqueous interfacial reaction. Various aromatic polymers were prepared from the reaction of equimolar amounts of the acid dissolved in aqueous base and the corresponding diacid chloride dissolved in an organic solvent [25, 38]. Because the reaction is between a dibasic acid in one phase and an arid chloride in the other phase, the copolymers may present a regularly alternating structure. In the reaction between sebacoyl chloride in chloroform and isophthalic acid sodium salt in water a copolymer that contain mostly sebacic arid units was obtained. These results can be explained by partial hydration of two acid chloride end groups to form an anhydride bond. 

Copolymers of fumaric acid or maleic anhydride and isophthalic add were prepared by melt condensation at 250-300 °C for 8 hours using acetic anhydride or polyphosphoric acid as dehydrative agents [43]. 

Definition Copolymer of trimethylpentanediol, isophthalic acid, and trimellitic anhydride monomers... 

Branched polymers in solution also show concentration-dependent transitions in viscosity. Copolymers of poly(ethylene terephthalate-co-ethylene isophthalate) (P(ET-co-EI)) were prepared by the polycondensation reaction of an equimolar mixture of dimethyl terephthalate (DMT) and dimethyl isophthalate (DM1) in the presence of a 100% excess of ethylene glycol (EG) (Scheme 3.1). Chain branching was introduced into the polymer using a tri-functional anhydride or a tricarboxylate at a level of 1 -1.5 molar percent. The concentration dependence of viscosity for these polymers were Tjsp ... 

Polyethylene can be crosslinked with peroxides to make it more suitable for coatings for electrical power cables [18]. Peroxides are also used to crosslink (also called cure) thermoset polyesters. Thermoset polyesters have a reactive alkene and are used to make fiberglass compositions such as used for boat hulls. Variations are possible, but commonly they are copolymers of fumaric acid or maleic anhydride with phthalic acid or isophthalic acid and a diol. The oligomer is typically dissolved in styrene. When a peroxide is mixed with the solution, crosslinking occurs and the polyester cures. The styrene solvent takes part in the reaction and the solution hardens. 

---