水辅助加工法制备聚丙撑碳酸酯/淀粉共混物

doi:10.11944/j.issn.1000-0518.2017.08.170128

摘要/Abstract

摘要：

分别采用普通熔融共混法和水辅助加工法,制备了具有不同共混形态的聚丙撑碳酸酯(PPC)/淀粉共混物,并研究了淀粉分散形态对共混物的玻璃化转变温度(T_g)、流变以及力学性能的影响。研究结果表明,采用普通熔融共混法时,淀粉未发生糊化,并以原颗粒状分散于基体中;而采用水辅助加工法时,淀粉发生糊化,并在挤出过程中原位形成纤维结构。当淀粉以纤维形式分散于PPC基体中时,其与PPC间的界面接触面积显著增加,二者的相互作用增强,PPC/淀粉共混物的T_g、储能模量以及复合黏度显著提高。力学性能测试结果表明,当淀粉质量分数为30%,采用水辅助加工法制备的PPC/淀粉共混物的拉伸模量相比于纯PPC提高了67.7%。

关键词: 聚丙撑碳酸酯, 淀粉, 共混物, 水辅助加工

Abstract:

Poly(propylene carbonate)(PPC)/starch blends with different blend morphologies were prepared by normal melt blending and water-assisted processing method. The effect of blend morphology on glass transition temperature(T_g), rheological and mechanical properties of PPC/starch blends was studied in details. The obtained results show that the starch remains its original granule structure when a normal melt blending is used. Interestingly, fine dispersed starch fibers are formed during extrusion of PPC/starch blends with the assistance of water. The formation of starch fibers in PPC matrix will increase the contact area between them leading to an enhanced interfacial interaction. Therefore, T_g, storage modulus and complex viscosity increase apparently. Additionally, when mass fraction of starch is 30%, there is a 67.7% increase in tensile modulus of PPC/starch blend.

Key words: poly(propylene carbonate), starch, blends, water-assisted processing

边俊甲, 徐明智, 韩常玉, 武丹丹, 韩立晶, 董丽松. 水辅助加工法制备聚丙撑碳酸酯/淀粉共混物[J]. 应用化学, 2017, 34(8): 885-890.

BIAN Junjia, XU Mingzhi, HAN Changyu, WU Dandan, HAN Lijing, DONG Lisong. Poly(propylene carbonate)/Starch Blends Prepared by Water-assisted Processing[J]. Chinese Journal of Applied Chemistry, 2017, 34(8): 885-890.

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