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Blends of poly[3,3‐bis(chloromethyl)oxetane] with poly(vinyl acetate). I. Thermal and mechanical properties
Author(s) -
Weilian Liu,
Qipeng Guo,
Zhiliu Feng
Publication year - 1992
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.1992.070460913
Subject(s) - oxetane , differential scanning calorimetry , materials science , vinyl acetate , dynamic mechanical analysis , glass transition , ultimate tensile strength , polymer chemistry , composite material , polymer , copolymer , thermodynamics , physics
Blends of poly[3,3‐bis(chloromethyl)oxetane] (Penton) with poly(vinyl acetate) were prepared. Compatibility, morphology, thermal behavior, and mechanical properties of blends with various compositions were studied using differential scanning calorimetry (DSC), dynamic mechanical measurements (DMA), tensile tests, and scanning electron microscopy (SEM). DMA study showed that the blends have two glass transition temperatures ( T g ). The T g of the PVAc rich phase shifts significantly to lower temperatures with increasing Penton content, suggesting that a considerable amount of Penton dissolves in the PVAc rich phase, but that the Penton rich phase contains little PVAc. The Penton/PVAc blends are partially compatible. DSC results suggest that PVAc can act as a β‐nucleator for Penton in the blend. Marked negative deviations from simple additivity were observed for the tensile strength at break over the entire composition range. The Young's modulus curve appeared to be S‐shaped, implying that the blends are heterogeneous and have a two‐phase structure. This was confirmed by SEM observations. © 1992 John Wiley & Sons, Inc.