摘要:
Le procédé à un seul réacteur pour la formation de copolymères en bloc comprenant des unités mésogènes d'ester aromatique contenant des éléments d'espacement flexibles d'alcane et des unités enroulées flexibles de polyester dans sa chaîne principale consiste: a) à faire réagir un monomère de alpha,omega-bis(hydroxybenzoyloxy) alcane avec un chlorure d'acide aromatique dans un réacteur pour former un oligomère de cristaux liquides fonctionnalisés contenant lesdites unités mésogènes, et b) à faire réagir ensuite l'oligomère obtenu en (a) dans le même réacteur soit avec (i) un oligomère d'un polyester soit avec (ii) les réactifs pour synthétiser l'oligomère de polyester (i).
摘要:
A polyphosphate ester composition consisting essentially of an effective amount of a cycloaliphatic epoxy composition for reduction of the total acid number of the composition. The phosphate ester is of the formula (I): where R can be aryl or alkaryl, R’ can be arylene, arylene-alkylene-arylene, or alkylene, and n ranges from about 1 to abut 5.
摘要:
A polymer composition, which is useful as a surfactant, formed by the reaction of an aklylene oxide (such as ethylene oxide), carbon dioxide, and a monocarboxylic acid chain terminator, such as one containing a fatty alkyl group.
摘要:
The disclosure teaches a blend of a predominant amount of a polyphosphate flame retardant and an effective amount of a liquid crystalline additive for viscosity reduction and compatibilization when blended with a thermoplastic polymer, as compared to use of just the polyphosphate flame retardant alone. The polyphosphate can comprise resorcinol bis(diphenyl phosphate) and/or its higher oligomers. The liquid can be a liquid crystalline segmented block copolymer or a liquid crystalline oligomer.
摘要:
A single reactor process for formation of block copolymers comprising aromatic ester mesogenic units containing flexible alkane spacers and polyester flexible coil units in the main chain thereof which comprises reacting an α, φ-bis(hydroxybenzoyloxy) alkane monomer with an aromatic acid chloride in the presence of a functionalized flexible coil oligomer under temperature conditions in which an acid chloride-terminated bis(hydroxyalkyl terephthalate) oligomer was first formed at a first, lower temperature and the block copolymer was then formed at a second, higher temperature by reacting this oligomer with the functionalized flexible coil oligomer.
摘要:
Blends can be formed which comprise a flexible coil polymer substrate, e.g., of a poly(alkylene terephthalate), and a thermotropic, essentially liquid crystalline oligomer which comprises aromatic units and at least one linear polyalkylene spacer. These blends can be used to form fibers or molded articles.
摘要:
Des prémélanges à adhésion interfaciale améliorée, pouvant être ultérieurement mélangés par fusion, peuvent être formés en chauffant, au-dessus de leur température de transition vitreuse mais au-dessous de leur température de fusion, un polymère à spirales flexibles, jouant le rôle de matrice, et une quantité moindre d'un copolymère bloc formé d'un polymère de cristaux liquides et d'un polymère à spirales flexibles.
摘要:
Epoxy resins that are suitable for forming epoxy laminates that meet a UL-94 rating of v-0 comprise a hydroxy-terminated oligomeric phosphonate comprising the repeating structure -OP(=0) (R)OArylene-, where R is alkyl, as a flame retardant.
摘要:
A crude phosphate ester product can be purified by first washing it with chelating agent composition (such as a dilute acidic solution) and then, preferably, water, drying the resulting product, and then treating the resulting product with an acid scavenger, as exemplified by an epoxy-containing compound, such as 3,4-epoxy cyclohexyl methyl-3,4-epoxy cyclohexyl carboxylate.