Compatibility of poly(ethylene oxide)–poly(vinyl acetate) blends
Compatibility of poly(ethylene oxide)–poly(vinyl acetate) blends
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聚环氧乙烷-聚醋酸乙烯酯共混物的相容性
DOI：
10.1002/pol.1982.180200712
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发表时间：
1982
期刊：
影响因子：
--
通讯作者：
N. Kalfoglou
中科院分区：
文献类型：
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作者：
N. Kalfoglou
研究了聚环氧乙烷-聚醋酸乙烯酯（PEO-PVA）共混物在五种组成下的相容性。采用共沉淀法和溶液浇铸法制备样品。在-120 ° C和65°C之间，在110 Hz下研究了干燥、淬火和退火样品的动态力学性能。该研究还包括在25°C下的拉伸测试、共混物形态的检查以及在高温下的DSC测量。光学显微镜显示，PEO的结晶进行基本上不受阻碍，在高达25%的聚（乙酸乙烯酯）的重量含量。较高水平的该组分大大降低球晶尺寸，并且在最高PVA组合物下没有结晶的证据。淬火和退火样品的热机械光谱表明除了较高（>75%）的PVA组合物之外，两种组分的有限混合。拉伸性能表明，在10-25%的PVA含量，由于可能的聚合物链段协会的相互加强。PEO的熔点下降是显着的高于25%的PVA，并已归因于PEO结晶相的形态变化。
The compatibility of poly(ethylene oxide)–poly(vinyl acetate) (PEO-PVA) blends was examined at five compositions covering the complete range. Samples were prepared by coprecipitation and solution casting. Dynamic mechanical properties were studied at 110 Hz between −120 and 65°C for dry, quenched, and annealed samples. The study also included tensile testing at 25°C, examination of blend morphology, and DSC measurements at elevated temperatures. Optical microscopy revealed that crystallization of PEO proceeds essentially unhindered at up to 25% poly(vinyl acetate) content by weight. Higher levels of this component drastically reduce spherulite size, and at the highest PVA compositions there was no evidence of crystallization. Thermomechanical spectra of quenched and annealed samples indicate limited mixing of the two components except for the higher (>75%) PVA compositions. Tensile properties show a mutual reinforcement at 10-25% PVA content due to possible polymer segment association. The melting-point depression of PEO is significant above 25% PVA and has been attributed to morphological changes of the PEO crystalline phase.