AB-type crosslinked polymer networks from vinyl terminated polyurethane and poly(methyl methacrylate)

✍ Scribed by V Sriram; S Subramani; Ganga Radhakrishnan

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 145 KB
• Volume: 50
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/pi.754

✦ Synopsis

Abstract

Vinyl terminated polyurethanes (VTPUs) were prepared by endcapping isocyanate terminated prepolymers with vinylbenzyl alcohol (VBA). AB‐type crosslinked polymer (ABCP) networks were generated by crosslinking the telechelic polyurethane with methyl methacrylate (MMA) in the presence of 2,2′‐azobisisobutyronitrile (AIBN) as free radical initiator. The spectral, thermal and mechanical properties of ABCPs were studied using Fourier Transform IR, thermogravimetry, dynamic mechanical analysis and stress‐strain analysis. The FTIR results confirm the formation of VBA, TP and ABCPs. Thermal behaviour of crosslinked polymers showed no significant weight loss up to 300 °C, indicating improved thermal stability. Dynamic mechanical tests revealed confinement of phase separation and good damping behaviour for the crosslinked networks. Stress‐strain analysis showed that tensile strength increases with increasing amounts of methyl methacrylate.

© 2001 Society of Chemical Industry