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By Eli M Pearce; B A Howell; R A Pethrick; G E Zaikov

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Extra resources for Physical chemistry research for engineering and applied sciences. Volume 2, Polymeric materials and processing

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The increase of α and β for all mixes studied (100–25% PP) has been observed at temperatures about melting point of PP having those parameters for liquid-crystal copolyester changed inconsiderably. Increasing content of liquid-crystal copolyester in the mix remarkably decreases the value of α both in solid state and in area of melting PP. The latter has to be accounted for when producing articles. The liquid-crystal compound is grouped in shape of concentric cylinders of various radii in mixes with polysulphones.

The aromatic polyester “ECONOL,” homopolymer of poly n-oxybenzoic acid, possesses the highest thermal resistant among the all homopolymeric polyethers [20] and attracts attention for the industry. Trends in Aromatic Polyesters 33 The poly n-oxybenzoic acid is the linear high-crystalline polymer with decomposition temperature in inert environment of 550 °C [20]. Below this point decomposition goes extremely slow. The loss in weight at 460 °C in air is 3% during 1 h of thermal treatment and than number is 1% at 400 °C.

Structural formula is shown in Fig. 1. 1 The structural formula of pentaerythritol tetrakis [3-(3,’5’-di-tert-butyl-4’hydroxyphenyl)propionate] stabilizer. A Study Thermal Stability of Polyurethane Elastomers 19 Samples of cured PUE were tested by the Netzsch DSC 204 F1 Phoenix heat flow differential scanning calorimeter. Calibration was performed on an indium standard sample. Samples weighing 9 to 12 mg were placed in an open aluminum crucible. Test temperatures were attained at 10K/min rate under constant purging with an inert gas (argon).

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