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Crystallization behavior and mechanical properties of poly(ethylene oxide)/poly( L ‐lactide)/poly(vinyl acetate) blends
Author(s) -
Kim KwangSok,
Chin InJoo,
Yoon Jin San,
Choi Hyoung Jin,
Lee Dong Choo,
Lee Kwang Hee
Publication year - 2001
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.2224
Subject(s) - copolymer , vinyl acetate , spherulite (polymer physics) , materials science , ethylene oxide , polymer chemistry , crystallization , ethylene glycol , lactide , morphology (biology) , miscibility , chemical engineering , polymer , composite material , biology , engineering , genetics
Poly(vinyl acetate) (PVAc) was added to the crystalline blends of poly(ethylene oxide) (PEO) and poly( L ‐lactide) (PLLA) (40/60) of higher molecular weights, whereas diblock and triblock poly(ethylene glycol)–poly( L ‐lactide) copolymers were added to the same blend of moderate molecular weights. The crystallization rate of PLLA of the blend containing PVAc was reduced, as evidenced by X‐ray diffraction measurement. A ringed spherulite morphology of PLLA was observed in the PEO/PLLA/PVAc blend, attributed to the presence of twisted lamellae, and the morphology was affected by the amount of PVAc. A steady increase in the elongation at break in the solution blend with an increase in the PVAc content was observed. The melting behavior of PLLA and PEO in the PEO/PLLA/block copolymer blends was not greatly affected by the block copolymer, and the average size of the dispersed PEO domain was not significantly changed by the block copolymer. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 3618–3626, 2001
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