摘要
目的解决在纳米SiO_2改性聚乳酸中,由于两者之间的不相容性导致复合材料性能较差的问题。方法根据纳米二氧化硅与L-乳酸的原位聚合原理制备纳米SiO_2与聚乳酸的相容剂——二氧化硅-g-聚乳酸(SiO_2-g-OLLA),并分别对纳米SiO_2,PLLA,PLLA/SiO_2,PLLA1/SiO_2-g-OLLA进行红外吸收光谱、热性能、力学性能、透气性能、透湿性能分析。结果 PLLA/SiO_2的分解温度高于PLLA且失重达到近74%,含SiO_2的质量分数为8%的PLLA1/SiO_2薄膜的拉伸强度和含质量分数为11%的拉伸强度几乎相同。PLLA的透氧气量和透水气量最小;PLLA1/SiO_2的透氧气量和透水气量最大。结论L-乳酸与纳米二氧化硅的反应符合两者的原位聚合原理,且加入质量分数为11%的纳米SiO_2仍能保持PLLA1/Si-g-OLLA/SiO_2薄膜具有较好的拉伸强度,PLLA1/SiO_2-g-OLLA膜的透湿透气性能均得到改善。
This work aimed to solve the problem of the poor mechanical properties of the composites due to the incompatibility of the nano silicon dioxide particles and the poly lactic acid（PLA）. Based on the In-situ polymerization principle,the compatibilizer Silica-g-poly lactic acid（SiO2-g-OLLA）of nano silicon dioxide and L-lactic acid was prepared,and then the samples were characterized using FTIR,calorific properties testing,mechanics performance testing,permeability testing and moisture permeability testing. The decomposition temperature of PLLA/SiO2 was higher than PLLA,and its weight loss reached about 74%. The tensile strength of PLLA1/SiO2 film containing 8% SiO2 was nearly equal to that of the film containing 11% SiO2. The values of oxygen permeation and water vapor permeation of PLLA were the lowest,while the values of oxygen permeation and water vapor permeation of PLLA1/SiO2 were the highest. The reaction between L-lactic acid and nano silicon dioxide obeyed the In-situ polymerization principle and the tensile strength of the PLLA1/Si-g-OLLA/SiO2 film was well kept after addition of 11% nano silicon dioxide,and the oxygen permeation and water vapor permeation performance was improved.
出处
《包装工程》
CAS
CSCD
北大核心
2016年第9期12-15,共4页
Packaging Engineering
关键词
纳米二氧化硅
聚乳酸
相容性
nano silicon dioxide
poly lactic acid
compatibility
