成核改性对聚乳酸结晶行为的影响  

Effect of nucleation agent and annealing on crystallization of polylactic acid

作　　者：文豪[1] 李仲昀 王冬[1] 张竞[1] 邹俊[1] 

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212003

出　　处：《武汉科技大学学报》2014年第5期360-364,共5页Journal of Wuhan University of Science and Technology

基　　金：江苏省产学研前瞻项目(BY2012177);江苏省高校科研成果产业化推进项目(JHB2012-41)

摘　　要：选用PPA-Zn、TMC-328和TMP-3000为成核剂(NA),分别与聚乳酸(PLA)熔融共混,改性制备成PLA/NA复合材料,通过差示扫描量热分析、偏光显微观察、X射线衍射、动态热力学分析和热变形温度测试研究PLA/NA材料的结晶行为、动态热力学性能和耐热性能。结果表明,3种成核剂中,PPA-Zn和TMC-328更能提高PLA结晶度、储能模量和热变形温度,PLA/PPA-Zn和PLA/TMC-328半结晶时间分别为0.27min和0.28min,晶体形貌分别为针状晶和枝状晶,为α晶型,初始储能模量分别为3.921GPa和4.486GPa,110℃退火60s结晶后的热变形温度分为127.1℃和121.1℃。PLA/NA composites were prepared by melt blending of PPA-Zn ,TMC-328 and TMP-3000 , which served as nucleation agents respectively ,with polylactic acid (PLA) .The effect of nucleation a-gent on the crystallization properties of PLA was investigated by the different scanning calorimetry (DSC) ,polarized optical microscopy (POM ) ,X-ray diffraction (XRD) and heat distortion tempera-ture (HDT) tester .The results indicate that nucleation effects of PPA-Zn and TMC-328 on PLA are better than that of TMP-3000 .The two nucleation agents can significantly improve the crystallization rate and crystallinity of PLA with the half crystallization time (t1/2) of PPA-Zn system and TMC-328 system at 0 .27 min and 0 .28 min ,respectively .POM observation finds that the crystal morphology of PLA/PPA-Zn composite and PLA/TMC-328 composite are acicular crystal and dentritic crystal . XRD results show that the crystal structure of PLA/PPA-Zn composite and PLA/TMC-328 composite areαform .After annealing at 110 ℃ for 60 s ,the HDT of PLA/TMC-328 composite and PLA/PPA-Zn composite can reach 121 .1 ℃ and 127 .1 ℃ ,respectively .

关 键 词：聚乳酸 成核剂 PLA/NA复合材料 结晶速率 热变形温度 

分 类 号：TQ323.4[化学工程—合成树脂塑料工业]