Publication: The chain extender content and NCO/OH ratio flexibly tune the properties of natural rubber-based waterborne polyurethanes
Issued Date
2015-01-01
Resource Type
ISSN
10974628
00218995
00218995
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2-s2.0-84932195755
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Mahidol University
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SCOPUS
Bibliographic Citation
Journal of Applied Polymer Science. Vol.132, No.36 (2015)
Suggested Citation
Anuwat Saetung, Phathanyaphon Tsupphayakorn-Ake, Tulyapong Tulyapituk, Nitinart Saetung, Pranee Phinyocheep, Jean François Pilard The chain extender content and NCO/OH ratio flexibly tune the properties of natural rubber-based waterborne polyurethanes. Journal of Applied Polymer Science. Vol.132, No.36 (2015). doi:10.1002/app.42505 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/35783
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Title
The chain extender content and NCO/OH ratio flexibly tune the properties of natural rubber-based waterborne polyurethanes
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Abstract
© 2015 Wiley Periodicals, Inc. The effects of chain extender content (ethylene diamine, EDA) and NCO/OH ratio on the properties of natural rubber-based waterborne polyurethanes (WPUs) were investigated experimentally. The particle size of WPU increased significantly with the NCO/OH ratio, in the presence of the EDA chain extender, while it was unaffected by the EDA content. The water uptake of WPU film increased with the EDA content, while the swelling in various solvents decreased. In a thermal analysis, the second decomposition stage of a WPU film increased with the EDA content and with the NCO/OH ratio that also positively affected the dynamic mechanical and mechanical properties. These factors in WPU films had no the effect on the T<inf>g</inf>. The stress-strain curves clearly showed the change in WPU films from soft elastomeric materials to ductile and hard plastics.