光致变色聚乳酸纤维的纺制及其微观结构与性能  

Spinning and microstructure and properties of photochromic polylactic acid fibers

作　　者：赵明顺 陈枭雄 于金超 潘志娟[1,2] ZHAO Mingshun;CHEN Xiaoxiong;YU Jinchao;PAN Zhijuan(College of Textile and Clothing Engineering,Soochow University,Suzhou,Jiangsu 215021,China;National Engineering Laboratory for Modern Silk(Suzhou),Suzhou,Jiangsu 215123,China)

机构地区：[1]苏州大学纺织与服装工程学院,江苏苏州215021 [2]现代丝绸国家工程实验室(苏州),江苏苏州215123

出　　处：《纺织学报》2023年第7期10-17,共8页Journal of Textile Research

摘　　要：为得到兼具光致变色性能与力学性能的光致变色聚乳酸(PLA)纤维,将PLA和光致变色微胶囊通过熔体纺丝及热拉伸工艺制备出光致变色PLA纤维,并系统分析了纤维的形貌、结晶及热学性能,着重研究了光致变色微胶囊对纤维力学及可逆变色行为的影响,揭示纤维性能差异对其内部结构的影响。结果表明:光致变色PLA纤维的断裂强度随着光致变色微胶囊质量分数的增加而减小,结晶度呈先上升后下降趋势,当光致变色微胶囊质量分数为2%时具有与纯PLA相当的断裂强度,为4.15 cN/dtex,且结晶度达到最大55.42%;光致变色PLA纤维的光致变色性能呈现出高灵敏度、优异褪色性及光稳定性,且变色强度随光致变色微胶囊质量分数的增加而提高,但非线性上升,通过调整光致变色微胶囊的质量分数,可以达到纤维变色功能与力学性能兼具的目标。Objective In response to the national theme of low-carbon environmental protection,replacing conventional petroleum-based fibers with degradable polymer fibers has become necessary.However,it seems to be a great challenge to obtain degradable polymer fibers photochromic properties while maintaining their mechanical properties.It is therefore necessary to develop photochromic fibers with mechanical properties and discoloration effects.Method The photochromic polylactic acid(PLA)fibers were prepared from PLA,and photochromic microcapsules by melt spinning and hot stretching processes,and their morphological,crystallographic,and thermal properties were systematically analyzed,with emphasis on the effect of photochromic microcapsules on the mechanical and reversible discoloration behavior of the fibers,so as to reveal the effect of the difference in fiber properties and their internal structure.Results The fiber morphology structure showed that the smooth cross-sections and surfaces(Fig.1,Fig.2)the pure PLA fibers.As the dosage of added photochromic microcapsules increased,the fibers were found to form more and more pores and defects,leading to the deterioration of the mechanical properties of the fibers.The photochromic PLA fibers prepared in this research demonstrated a breaking strength of 3.54-4.18 cN/dtex,an elongation at break of 19.27%-27.01%,and a modulus of elasticity of 55.67-58.66 cN/dtex(Fig.3).With the increase in dosage of photochromic microcapsules,the breaking strength and elongation at the break of the fibers illustrated a decreasing trend.Even so,when the mass fraction of microcapsules was 6%,the breaking strength and elongation at the break of the fibers were still 3.54 cN/dtex and 20.21%,which could meet the requirements of subsequent processing.Furthermore,the crystallinity of fibers with the increase in dosage of photochromic microcapsules tended to rise and then fall(Fig.5).The crystallinity of fibers without microcapsules addition was 50.22%.The maximum crystallinity of 55.42%was reached when

关 键 词：聚乳酸纤维 熔体纺丝 光致变色 微胶囊 变色机制 力学性能 

分 类 号：TS102.5[轻工技术与工程—纺织工程]