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Semi‐IPN of biopolyurethane, benzyl starch, and cellulose nanofibers: Structure, thermal and mechanical properties
Author(s) -
Haque Md MinhazUl,
Oksman Kristiina
Publication year - 2016
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.43726
Subject(s) - nanocomposite , materials science , nanofiber , ultimate tensile strength , cellulose , interpenetrating polymer network , polymer , dynamic mechanical analysis , composite material , starch , polymer chemistry , chemical engineering , chemistry , organic chemistry , engineering
The aim of this study was to develop bionanocomposites of biopolyurethane (PU), benzyl starch (BS), and cellulose nanofibers (CNF) with semi‐interpenetrating polymer network (S‐IPN) structure of improved properties. Morphology, thermal and mechanical properties of S‐IPN blends and nanocomposites were studied and compared with the neat polymers. Microscopy study showed that PU and BS were partially miscible as well as CNF were dispersed in both PU and BS phases in the nanocomposites. Dynamic mechanic thermal analysis demonstrated that BS decreased the tan δ peak of the PU while CNF increased it . The positive shifting of tan δ peak in the S‐IPN nanocomposite also indicated the presence of CNF in the PU phase. It was also noticed that S‐IPN nanocomposite displayed two tan δ peaks at higher temperature, indicating molecular interaction among BS, PU, and CNF. Furthermore, the S‐IPN nanocomposites displayed significantly higher E‐modulus and tensile strength compared with the neat PU. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133 , 43726.