摘要
采用熔融共混法制备聚乳酸/癸二酸二苯甲酰肼(PLA/SBH)共混物。通过差示扫描量热(DSC)分析研究成核剂SBH添加量以及等温温度对PLA熔体等温结晶行为的影响。由结晶动力学分析可知,随着SBH添加量增大,PLA半结晶时间大幅缩短,结晶速率显著加快。加入SBH后,Avrami指数在2.51~3.14之间,PLA熔体结晶以异相成核为主,晶体生长为三维生长。对于PLA急冷模压样条,结晶度仅为2.9%。而加入1.0份SBH后,PLA熔体在134℃下经过3 min等温结晶处理后,所得PLA/SBH(100/1.0)模压样条结晶度达到42.0%。相对于急冷PLA样条,经过热处理的PLA/SBH(100/1.0)样条的维卡软化点由64.3℃大幅提升至160.6℃,而拉伸强度也有所增大。
Polylactide/sebacate benzohydydrazide(PLA/SBH)were prepared by melt blending method.Effect of SBHloading,as well as temperature on isothermal crystallization behavior of PLA melt was researched by using differential scanningcalorimetry(DSC).From crystallization kinetic analysis,it can be pointed to the fact that crystallization half time of PLAsignificantly be reduced and its isothermal crystallization rates largely accelerated with increasing of SBH loadings.With theintroduction of SBH,Avrami constant is in the range of2.51and3.14.As a result,it is confirmed that the nucleation type of PLA/SBH blend should be heterogeneous nucleating and its growth mode should be3D growth.For quenched PLA specimen,itscrystallinity is only2.9%.However,while PLA/SBH(100/1.0)melt has been isothermally crystallized at134℃for3min,thecrystallinity of the obtained specimen reach to42.0%.As a result,vicat softening point of the crystallized PLA/SBH specimenincrease from64.3℃for the quenched PLA specimen to160.6℃significantly.Moreover,PLA/SBH specimen also show a slightincrease in tensile strength.
作者
陈烜
石慧
陈文凯
季欣
庞素娟
潘莉莎
徐鼐
黎坛
王俊峰
Chen Xuan;Shi Hui;Chen Wenkai;Ji Xin;Pang Sujuan;Pan Lisha;Xu Nai;Li Tan;Wang Junfeng(School of Materials and Chemical Engineering, Hainan University, Haikou 570228, China;National & Local Joint Engineering & Research Center, Shiner Industrial Co., Ltd., Haikou 570125, China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2017年第7期101-106,共6页
Engineering Plastics Application
基金
国家自然科学基金项目地区科学基金(51663010)
海南省产学研一体化专项项目(cxy20150023)
海南省重点研发计划高新技术类项目(ZDYF2016016)
关键词
聚乳酸
成核剂
等温结晶
维卡软化点
拉伸性能
polylactide
nucleating agent
isothermal crystallization
vicat softening point
tensile property
