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Crosslinking in Materials Science by Piotr Penczek, Piotr Czub, Jan Pielichowski (auth.)

By Piotr Penczek, Piotr Czub, Jan Pielichowski (auth.)

This sequence provides serious reports of the current and destiny developments in polymer and biopolymer technological know-how together with chemistry, actual chemistry, physics and fabrics technological know-how. it's addressed to all scientists at universities and in who desire to hold abreast of advances within the subject matters coated.

Impact issue score: continuously number 1 in Polymer technological know-how. additional information in addition to the digital model of the complete content material to be had at: www.springerlink.com

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Similarly, the curing method and regime affect the stability of the resins and the composition of the degradation products only to a small extent. It is also well known from the previous research [136] that the structure of the initiator affects the thermal properties of UPRs cured with MEKP being more thermally stable than those cured with benzoyl peroxide. TG, DTA, isothermal TG, IR and hot stage polarizing microscopy studies [137] of the thermal degradation of diethylene-glycol-based UPRs synthesized by one-step, two-step and three-step polyesterification processes showed that the mode of thermal degradation of the prepared UPRs was different in air and in nitrogen.

It was found that the interpenetration and/or compatibility between the two networks depended on the morphology of graft VERs and the best interpenetration was obtained for 200-g-VER. Moreover, the compatibility of SINs would be improved due to the higher content of urethane groups existing in grafts which should mix well with groups in the PU networks (BO-g-VER). The presence of BO-g-VER and 200-g-VER resulted in an increase in the tensile strength and the elastic modulus of the investigated SINs (Table 23).

A first order (in both ethylene glycol and ethylene diester concentration) kinetic model was proposed. It was found that ethylene glycol did not play a significant role as an internal catalyst in the glycolysis of PET. Moreover, the zinc salts used did not seem to influence the glycolysis rate at a temperature above 245 ◦ C, they catalyzed however the melt hydrolysis in an earlier study and appeared to have a catalytic effect on glycolysis below 245 ◦ C. The authors suggest that the difference in catalytic behavior may be explained by the differences in the solubility of PET and its oligomers in water and in ethylene glycol.

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