热处理张力对PLLA/PDLA纤维结构及性能的影响
摘要
对PLLA/PDLA牵伸丝在不同张力下进行热处理,分别采用差示扫描量热仪(DSC)、广角X射线衍射(WAXD)、扫描电镜(SEM)等手段对不同张力下热处理得到的纤维样品进行表征和分析。结果表明:经热处理后PLLA/PDLA纤维中仅含有sc立构晶,随着张力的增加,sc立构晶的熔融热焓有小幅增长,纤维的结晶度与取向度稍有增加,同时sc立构晶各晶面所对应的晶粒尺寸均有所增加。此外,张力的增加会引起纤维直径的下降,但对表面形貌无明显影响,仍呈现不规则突起的粗糙表面。
引文
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[2]Zibiao Li,Beng Hoon Tan,Tingting Lin etal.Recent advances in stereocomplextion of enantiomeric PLA-based copolymers and application.Process in Polymer Science,2016,62:22-72.
[3]Daisuke Masaki,Yoko Fukui,Kiyotsuna Toyohara etal.Stereocomplex formation in the poly(L-lactid acid)/poly(D-lactid acid) melt blends and the melt spun fibers.Sen’I Gakkaishi,2008,64(8):212-219.
[4]Midori Takasaki,Hiroshi Ito,Takeshi Kikutani.Development of stereocomplex crystal of polylactide in high-speed melt spinning and subsequent drawing and annealing process.Journal of Macromolecular Science Part B:Physics,2003,B42:403-420.
[5]Nelly Rahman,Takahiko Kawai,Go Matsuba etal.Effect of polylactide stereocomplex on the crystallization behavior of poly(L-lactic acid).Macromolecules,2009,42,4739-4745.