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首页> 外文期刊>Journal of Applied Polymer Science >Properties of soy protein isolate/poly(ethylene-co-ethyl acrylate-co-maleic anhydride) blends
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Properties of soy protein isolate/poly(ethylene-co-ethyl acrylate-co-maleic anhydride) blends

机译：大豆分离蛋白/聚乙烯-丙烯酸乙酯-马来酸酐共混物的性能

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Blends of soy protein isolate (SPI) with 10, 20, 30, 40, and 50% poly(ethylene-co-ethyl acrylate-co-maleic anhydride) (PEEAMA), with or without addition of 2.0 wt % methylene diphenyl diisocyanate (MDI), were prepared by mixing with an intensive mixer at 150degreesC for 5 min, and then milling through a 1-mm sieve. Blends were then compression-molded into a tensile bar at 140degreesC. Thermal and mechanical properties and water absorption of the blends were studied by differential scanning calorimetry (DSC), dynamical mechanic analysis (DMA), a test of modulus and tensile strength (with an Instron tensile tester), a water absorption test, and scanning electron microscopy (SEM). The blends showed two composition-dependent glass transition temperatures. Furthermore, as the SPI content increased, the melting temperature of PEEAMA remained constant but the heat of fusion decreased. These results indicate that SPI and PEEAMA were partially miscible. Morphology observations support these results. Increasing the PEEAMA content resulted in decreases in the modulus and tensile strengths and increases in the elongation and toughness of the blends. Water absorption of the blends also decreased with increased PEEAMA content. Incorporating MDI further decreased the water absorption of the blends. The mechanism of water sorption of SPI was relaxation controlled, and that of the blends was diffusion controlled. (C) 2003 Wiley Periodicals, Inc. [References: 34]
机译：大豆蛋白分离物（SPI）与10％，20％，30％，40％和50％的聚（乙烯-丙烯酸乙酯-共马来酸酐）（PEEAMA）的混合物，可添加或不添加2.0 wt％的亚甲基二苯基二异氰酸酯（通过在150°C下用强力混合器混合5分钟，然后通过1毫米筛子研磨来制备MDI。然后将共混物在140℃压缩成型为拉伸棒。通过差示扫描量热法（DSC），动态力学分析（DMA），模量和拉伸强度测试（使用Instron拉伸测试仪），吸水率测试和扫描电子对共混物的热力学性能和吸水率进行了研究。显微镜（SEM）。共混物显示出两个取决于组成的玻璃化转变温度。此外，随着SPI含量的增加，PEEAMA的熔融温度保持恒定，但熔化热降低。这些结果表明SPI和PEEAMA是部分可混溶的。形态学观察支持这些结果。 PEEAMA含量的增加导致共混物的模量和拉伸强度降低，并且伸长率和韧性增加。共混物的吸水率也随着PEAAMA含量的增加而降低。掺入MDI进一步降低了混合物的吸水率。 SPI的吸水机理是松弛控制的，而共混物的吸水机理是扩散控制的。 （C）2003 Wiley Periodicals，Inc. [参考：34]

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