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Studies on Novel Thermally Stable Segmented Polyurethanes Based on Thiourea-derivative Diols by Ayesha Kausar; Sonia Zulfiqar; Zahoor Ahmad; Muhammad Ilyas Sarwar is a Materials Science article available to read on EtoBox.

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Novel thermoplastic segmented poly(urethane-thiourea)s (PURs) were synthesized via one-step polymerization from aromatic diols containing sulfur (thiourea linkage) in the main-chain, including terephthaloyl bis (3-(2-hydroxopyridyl) thiourea) (TBHPT) and terephthaloyl bis (3-(5-naphtholyl) thiourea) (TBNT), along with 1,4-phenylene diisocyanate (PDI) as hard segment and 20, 50 and 80 mol% polyethylene glycol (PEG) as a soft segment. The prepared chain extenders and polymers were characterized by conventional methods, and physical properties such as h inh , solubility, thermal stability and thermal behavior were studied. Easily processable PURs with excellent thermal stability were obtained by incorporating 20 mol% PEG in the soft segment. Thermogravimetric analysis indicated that poly (urethane-thiourea)s were fairly stable above 500 C and own high glass transition temperatures about 263e266 C. These polymers also showed partially crystalline structures. Ultimately, weight average molecular weights (M w ) of PURs were up to 109 Â 10 3 . Compared to typical polyurethanes, PURs exhibited better thermal stability and T g 's owing to rigid hard segment structure.

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Author

Ayesha Kausar; Sonia Zulfiqar; Zahoor Ahmad; Muhammad Ilyas Sarwar

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0141-3910)

Published

2010

Language

EN

Field

Materials Science (Physical Sciences)