Poly- general properties

At constant PBT/PTMO composition, when the molar mass of PTMO block is >2000, partial crystallization of the polyether phase leads to copolymer stiffening. The properties of polyesterether TPEs are not dramatically different when PTMO is replaced by polyethers such as poly(oxyethylene) (PEO) or poly(oxypropylene). PEO-based TPEs present higher hydrophilicity, which may be of interest for some applications such as waterproof breathable membranes but which also results in much lower hydrolysis resistance. Changing PBT into a more rigid polymer by using 2,6-naphthalene dicarboxylic acid instead of terephthalic acid results in compounds that exhibit excellent general properties but poorer low-temperature stiffening characteristics. 

General Properties. It has been shown 16) that the incorporation of cobalt chloride into a poly(amide acid) solution and processing the solvent cast film to temperatures up to 300 c in an appropriate... 

The study by low-angle X-ray diffraction of AB and ABA block copolymers of styrene and isoprene has allowed Gallot et al.1S9-166) to demonstrate that the existence of mesomorphic structures is a quite general property of block copolymers this property is related to the incompatibility of the macromolecular chains11 and the presence in the molecule of a crystallizable (e.g. poly(ethylene oxide)) block is not the condition that governs the formation of mesomorphic structures. 

The poly-phenols or poly-hydroxy benzenes are obtained from the dry distillation products of wood. The methods of synthesis are in general those for the mono-phenols though the diazo reaction does not usually work well with amino phenols. Also some of the methods of preparation used for poly-phenols do not apply to the mono-phenols. In general properties they resemble the mono-compounds, but they are usually more easily soluble in water, react more readily and are characterized by their strong reducing properties. 

Table VI contains the general properties for 50-60% HARD SEGMENT polymers. This table contains polymers which have been developed in the past such as the Polyurethanes in the 55 to 65 Shore D hardness (Fascia materials), as well as Poly(urea-urethanes) which are more recent developments. This hard segment range also covers 65 to 75D intermediate modulus materials which are in reality toughened plastics. The raw materials prices are for comparison purposes.

Table 5.4 General Properties of Fluorinated Poly(Arylene Ether Benzoxazole)s [52]...

Poly(methyl vinyl ether-alt-MA), 316, 621 applications, 443, 450, 621 general properties, 425, 437 Poly(methyl vinyl ketone-alt-MA), 290, 322 Poly(4-methyl-5-vinylthiazole-co-MA), 387 Poly(2,5-norborndiene-co-sulfur dioxide), 362 Poly(octadecene-l-alt-MA), 431, 586 applications, 447, 586 properties, 434, 435 Poly(l,3,6-octatriene-co-MA), 349 Poly(l-octene-alt-MA), 338, 586 Poly(octyl vinyl ether-alt-maleic acid), solution properties, 439 Polyolefins MA containing, 289 MA ene reaction, 160 MA grafted, 477 maleimides in vulcanization, 511 Poly(olefins-co-MA) film properties, 436 process patents, 586 Poly(/ -oxathiene-alt-MA), 388, 412-414 Poly(oxycyclohexene), MA crosslinked, 516 Poly(l,3-pentadiene-alt-MA), 343, 346-348,... 

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