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Studies on chain extension of a novel bio‐based engineering elastomer using 4,4‐diphenyl methane diisocyanate as a chain extender
Author(s) -
Jiang Lei,
Kang Hailan,
Wang Zhao,
Zhang Liqun,
Mao Lixin,
Wang Yiqing
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.40756
Subject(s) - elastomer , extender , fourier transform infrared spectroscopy , molar mass , materials science , polymer chemistry , gel permeation chromatography , diol , thermal stability , chemical engineering , polyurethane , polymer , chemistry , composite material , organic chemistry , engineering
A novel hydroxyl‐terminated bio‐based engineering elastomer (BEE) was synthesized from four bio‐based monomers by adding excess diol. Then the BEE was chain extended in Haake torque rheometer with 4,4‐diphenyl methane diisocyanate (MDI) as chain extender. The molar ratio of NCO/OH, reaction temperature and reaction time of the chain‐extension reaction were studied, and the optimum condition was determined by the gel permeation chromatography (GPC), soxhlet extraction, and fourier transform infrared spectroscopy (FTIR) results. After chain extension, (i) the number‐average molecular weight of BEE became about 3.5 times of the original BEE, (ii) the thermal stability was improved and the crystallization rate was lower, (iii) and the mechanical properties were significantly improved with nano‐SiO 2 as reinforcing filler. The chain‐extended BEE would have potential wide applications in engineering field. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40756.