Development of Highly Crystalline Polyurethanes from Hydroxy Terminated Polyesters

Authors

  • V. Swapna  Inorganic & Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad, India
  • K. Sasidhar  Akzonobel, Amsterdam, Netherlands
  • Dipak Chattopadhyay  Honeywell India Technology Center, Gurgaon
  • M. Lakshmi Kantam  Inorganic & Physical Chemistry Division, CSIR-Indian Institute of Chemical Technology, Hyderabad, India
  • Ramanuj Narayan  Polymers & Functional Materials Division, CSIR-Indian Institute of Chemical Technology, Hyderabad, India
  • B. Thirupathi  Department of Botany, Osmania University, Hyderabad, India
  • S. Gangadhar Rao  Department of Botany, Osmania University, Hyderabad, India

Keywords:

Diisocyanate, DSC, Polyurethanes, TGA, THP

Abstract

The present work describes two series of crystalline polyester based polyurethanes pent synthesized from 4, 4' diphenyl methane diisocyanate, chain extender 1,4 patanediol and low molecular weight polyesters, one with and another without the cross-linker, trimethylol propane (THP). The soft segment of the polyurethanes were composed of PEG based polyesters, which introduces waxy character to the polymers, but disphenyl methane disocyanate good crystalline to the polyurethanes. It was observed that incorporation of certain percentage of cross linker reduces the crystallinty of the system. The polyester ware prepared using both aliphatic acids such as maleic acid and phthalic anhydride. The synthesized polyurethanes were examined by thermo gravimetric analysis, which showed that the polyurethanes molergo thermal degradation at lower temperatures in oxygen atmosphere compared to that of the inert nitrogen atmosphere. The degradation pattern shows the fact that in oxygen atmosphere the degradation step is expanded one where as in the inert atmosphere the degradation step is rather stepper. The samples were also investigated by DSC, which reveals the melting temperature of the samples. The XRD curves also support the crystalline nature of the polyurethanes.

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International Journal of Scientific Research in Science and Technology

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Published

2017-08-31

Issue

Volume 3, Issue 6, July-August-2017

Section

Research Articles

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How to Cite

[1]
V. Swapna, K. Sasidhar, Dipak Chattopadhyay, M. Lakshmi Kantam, Ramanuj Narayan, B. Thirupathi, S. Gangadhar Rao, " Development of Highly Crystalline Polyurethanes from Hydroxy Terminated Polyesters , International Journal of Scientific Research in Science and Technology(IJSRST), Online ISSN : 2395-602X, Print ISSN : 2395-6011, Volume 3, Issue 6, pp.259-266, July-August-2017.