摘要
为获得高质量的聚乳酸/聚(3-羟基丁酸-co-3-羟基戊酸共聚酯)(PLA/PHBV)双组分生物降解纺粘非织造材料,对PLA/PHBV母粒的相对分子质量及分布、熔体指数、热力学、结晶和流变性能进行了研究,并对PLA/PHBV纺粘纤维的热力学和结晶性能进行了探讨。结果表明:PLA/PHBV母粒重均分子质量约为120 000,分布指数为1.99;热失重起始热分解温度为285℃,适宜纺粘非织造挤出加工,合适的纺粘加工温度约为210℃。PLA/PHBV熔体在剪切速率小于1 000 rad/s时,表观黏度对剪切速率变化敏感;熔体对温度的敏感程度随着剪切速率的增大而降低。纺粘加工工艺对PLA/PHBV原料的热力学和结晶性能影响显著。与PLA/PHBV母粒相比,纺粘纤维结晶度下降明显,但非晶区取向程度提高。
In order to obtain a high quality poly （lactic acid） （PLA）/poly （3-hydroxybutyrate-co-3-hydroxyvalerate） （PLA/PHBV） two-component biodegradable spun-bonded nonwoven,the relative molecular weight and distribution,melt flowing index,thermal properties,crystallization and rheological behavior of PLA/PHBV masterbatch were investigated,along with the thermal properties and crystallization of PLA/PHBV spun-bonded fiber.The results showed that when the weight-average molecular weight of PLA/PHBV masterbatch was about 120 000,molecular weight distribution index was 1.99,the initial decomposition temperature was 285 ℃,and the appropriate processing temperature suitable for spun-bonded extrusion processing was about 210 ℃.The apparent viscosity of PLA/PHBV melt was sensitive to the shear rate under 1 000 rad/s,but the level of sensitivity to temperature decreased as the shear rate increased.The spun-bonded processing conditions had significant effect on the thermal properties and crystallization of PLA/PHBV masterbatch.Compared with PLA/PHBV masterbatch,the degree of crystallinity of spun-bonded fiber decreased obviously but the orientation in amorphous region increased.
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2014年第9期19-24,共6页
Journal of Textile Research
基金
国家自然科学基金资助项目(51203141)
浙江省自然科学基金资助项目(LY12E03006)
浙江省科技厅计划项目(2011C31011)
"产业用纺织材料技术"浙江省重点科技创新团队项目(2011R50003)
浙江省高校重中之重学科开放基金资助项目(2013YXQN08)
