聚乳酸/有机蒙脱土复合材料制备及性能研究  

Preparation of Ploylactic Acid/OMMT Composite and Research on Its Properties

作　　者：陈景华[1] 郝发义[1] 马爽[1] 于跃飞[1] CHEN Jing-hua HAO Fa-yi MA Shuang YU Yue-fei(University of Shanghai for Science and Technology, Shanghai 200093, Chin)

机构地区：[1]上海理工大学,上海200093

出　　处：《包装工程》2017年第19期14-19,共6页Packaging Engineering

基　　金：上海市教委本科重点课程(包装材料学)项目;上海市属高校应用型本科试点专业建设(包装工程专业)(10-17-309-004)

摘　　要：目的测试聚乳酸/有机蒙脱土复合材料的性能并进行研究。方法通过溶液插层法制备聚乳酸(PLA)/有机蒙脱土(OMMT)纳米复合材料,对材料的热稳定性能、流变学性能和力学性能等进行测试分析。结果 PLA,PLA/OMMT(质量分数为3%)和PLA/OMMT(质量分数为6%)的结晶度分别为13.01%,15.43%,18.26%,热分解温度分别为336.36,343.55,345.14℃,在336.36℃时残余质量分数分别为82.45%,85.57%,87.58%。当温度一定时,频率增大,储能模量和耗能模量也随之增大,在测试频率范围内,耗能模量大于储能模量。几种材料均呈现剪切变稀效应,且随着频率的增大,有机蒙脱土纳米含量越多的复合材料其粘度也增大且较为显著。随着OMMT含量的增加,拉伸模量得到提高,拉伸强度基本不受影响,伸长率先提高再降低。结论同聚乳酸相比,纳米复合材料的热稳定性能得到提高,结晶度增大,流变学性能和拉伸力学性能得到提高。The work aims to test and research the properties of polylactic acid/OMMT nanocomposites. Polylactic acid（PLA）/organic montmorillonite（OMMT） nanocomposites were prepared by solution intercalation method, and then the thermal stability, rheological and mechanical properties of such nanocomposites were tested and analyzed. The degrees of crystallinity of PLA, PLA/OMMT（mass fraction： 3%） and PLA/OMMT（mass fraction： 6%） were 13.01%, 15.43% and 18.26%, respectively. The thermal decompositions temperature of PLA, PLA/OMMT（mass fraction： 3%） and PLA/OMMT（mass fraction： 6%） were 336.36, 343.55 and 345.14 ℃, respectively. The residual mass fractions at 336.36 ℃ were respectively 82.45%, 85.57% and 87.58%. The storage modulus and loss modulus were increased with the increase in the frequency when the temperature reached certain value. The loss modulus was greater than the storage modulus within the testing frequency range. Several materials exhibited shear thinning effect, and the viscosity of the composites with more organic montmorillonite nano-content was also significantly enhanced with the increase in the frequency. With the increase in the OMMT content, the tensile modulus was increased, the tensile strength was basically not affected, and the elongation increased first and then decreased. Compared with polylactic acid, the thermal stability of nanocomposites is enhanced, the crystallinity is increased, and the rheological and tensile mechanical properties are improved.

关 键 词：聚乳酸 纳米复合材料 热稳定性 流变学性能 

分 类 号：TB484[一般工业技术—包装工程]