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聚乙二醇对聚羟基丁酸戊酸酯(PHBV)热特性和力学性能的影响

Effects of Polyethylene Glycol on Thermal and Mechanical Properties of PHBV
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摘要 以聚乙二醇(PEG)为增塑剂、聚羟基丁酸戊酸酯(PHBV)为基体相,采用熔融共混法制备生物可降解PEG/PHBV复合材料。采用差示扫描量热仪(DSC)、热重分析仪(TG)、力学试验机探讨了PEG的添加量(5%-25%)对复合材料的结晶性能、热稳定性和力学性能的影响。结果表明,PEG的加入使得PHBV复合材料在较低的温度下形成更加完善的晶体,同时使得复合材料的结晶过程变得更加困难,结晶度下降。PHBV复合材料的热稳定性随着PEG添加量的增加先降低后升高,当PEG添加量为25%时,热稳定性能达到最佳。力学性能表明,PEG的加入使得PHBV复合材料的拉伸断裂伸长率和冲击强度显著提高,较纯PHBV增幅最大为57.0%和251.9%,复合材料的韧性得到明显改善,但拉伸强度和拉伸模量有所降低。 Polyethylene glycol ( PEG )/poly ( 3-hydroxybutyrate-co-3-hydroxyvalerate ) ( PHBV ) composites were prepared by melt compounding with PHBV as the matrix and PEG as the plasticizer. The effects of PEG addition on the mechanical properties, crystalline properties and thermal stability of the composites were investigated using differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA) and mechanical testing machine. Results show that the original imperfect crystals of PHBV are melted crystal under the low temperature with the addition of plasticizer, forming more perfect crystals, the crystallization process of PEG/PHBV composites becomes more difficult, and the erystallinity decreases. The thermal properties of PEG/PHBV composites decrease firstly and then increase with the best thermal stability by the 25% PEG addition. In the aspect of mechanical properties, the plasticizer addition is beneficial to improve the elongation at break and impact strength of the PEG/PHBV composites with the maximum of 57.0% and 251.9% compared with neat PHBV, respectively, but the tensile strength and Young modulus decrease.
出处 《塑料工业》 CAS CSCD 北大核心 2016年第9期79-82,116,共5页 China Plastics Industry
基金 南京林业大学杰出青年基金项目(项目编号:NLJQ2015-02)
关键词 聚羟基丁酸戊酸酯 聚乙二醇 热性能 结晶性能 Poly ( 3-hydroxybutyrate-co-3-hydroxyvalerate ) Polyethylene Glycol Thermal Property Crystalline Property
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