有机硅改性聚氨酯增韧聚乳酸的研究  

Study on the Toughness Modification of PLA with TPSiU

作　　者：黄爽 孙旭鹏 朱爽 韩克清[1] Huang Shuang;Sun Xupeng;Zhu Shuang;Han Keqing(State Key Laboratory For Modification of Chemical Fibers and Polymer Materials,College of Materials Science and Engineering,Donghua University,Shanghai 201620,China)

机构地区：[1]纤维材料改性国家重点实验室东华大学材料科学与工程学院

出　　处：《塑料科技》2019年第8期49-54,共6页Plastics Science and Technology

基　　金：国家重点研发计划资助(2017YFB0309304)

摘　　要：针对聚乳酸(PLA)韧性差的特点,采用有机硅改性热塑性聚氨酯(TPSiU)对PLA通过熔融共混进行增韧改性,考察了TPSiU含量对PLA/TPSiU共混物微观结构、热性能及力学性能等的影响。研究结果表明,TPSiU的加入,使PLA由脆性材料转变为韧性材料,共混物的拉伸强度、弹性模量,冲击强度均随TPSiU含量的增加呈先增大后减小的趋势,当TPSiU的质量分数为20%时,PLA/TPSiU共混物的断裂伸长率提高约8倍。PLA/TPSiU共混物中两相呈海-岛结构,相容性欠佳,而且随着TPSiU含量的增加,"岛"相尺寸逐渐增大。另外,TPSiU的加入对PLA的热性能稍有影响,当TPSiU质量分数为10%时,共混体系的耐热性与纯PLA相当。To improve the poor toughness of poylactic(PLA),organosilicon modified thermoplastic polyurethane(TPSiU)was used to prepare PLA/TPSiU blends by melt blending.The microstructure and thermal properties,mechanical properties of PLA/TPSiU blends with different contents of TPSiU were studied.The results showed that PLA transformed from brittle material to ductile material with the addition of TPSiU.The tensile strength,elastic modulus and impact strength of the blends increased firstly then decreased with the increase of TPSiU content.When the mass fraction of TPSiU was 20%,the elongation at break of PLA/TPSiU blends increased to 8 times of pure PLA.The two phases in PLA/TPSiU blends presented the sea-island structure,and the compatibility was poor.With the increase of TPSiU content,the size of island phase increased gradually.In addition,the thermal properties of the PLA were slightly affected by the addition of TPSiU.When the mass fraction of TPSiU was 10%,the heat resistance of the blend was comparable to that of pure PLA.

关 键 词：聚乳酸 有机硅改性热塑性聚氨酯 共混改性 增韧 

分 类 号：Q323.4[生物学—遗传学] TB332[一般工业技术—材料科学与工程]