氮化硼、贝壳粉对聚乳酸材料结晶性能与导热性能的影响  

Effects of boron nitride and shell powder on crystallization and thermal conductivity of polylactic acid materials

作　　者：丁九阳 童敏杰 刘贵 马博谋 DING Jiuyang;TONG Minjie;LIU Gui;MA Bomou(College of Textiles,Donghua University,Shanghai,China;Innovation Center for Textile Science and Technology,Donghua University,Shanghai,China;Fujian Fiber Inspection Center,Fuzhou 350008,Fuzhou,Fujian,China)

机构地区：[1]东华大学纺织学院,上海 [2]东华大学纺织科技创新中心,上海 [3]福建省纤维检验中心,福建福州

出　　处：《东华大学学报（自然科学版）》2024年第2期39-45,共7页Journal of Donghua University(Natural Science)

基　　金：福建省工业引导性(重点)项目(2021H0037)。

摘　　要：以聚乳酸(PLA)为原料,选用氮化硼(boron nitride,BN)与贝壳粉作为提高PLA导热性能的功能粉体,采用熔融共混的方法制备具有高导热性能的BN/PLA和贝壳粉/PLA复合材料,研究功能粉体质量分数为0.5%、1.0%、1.5%时复合材料的结晶性能与导热性能的变化。利用差示扫描量热仪(DSC)分析了复合材料的结晶度和在不同结晶条件下的半结晶时间(t_(1/2));通过万能拉伸机测试复合材料的力学性能;通过扫描电子显微镜观察拉伸断面的形貌特征;使用导热系数测试仪测试添加不同质量分数无机粉体的复合材料的导热系数。结果表明:在加入BN与贝壳粉后,试样的结晶度分别提高至18.8%和15.3%;在温度为105℃的条件下,添加质量分数为1.5%的BN与贝壳粉分别能使BN/PLA和贝壳粉/PLA的t_(1/2)降低到0.33和0.39 min;随着功能粉体质量分数的增加,复合材料的导热系数逐渐上升,并且相对于单一功能粉体,BN与贝壳粉的复配粉体对PLA导热性能的提高效果更加显著,由0.177 W/(m·K)最高升至0.319 W/(m·K)。研究结果为后续制备凉感纤维提供参考。The boron nitride(BN)/polylactic acid(PLA)and shell powder/PLA composites with high thermal conductivity were prepared by melt blending method using PLA as raw material and BN and shell powder as functional powders to improve the thermal conductivity of PLA.The changes in crystallinity and thermal conductivity of the composites were studied when the mass fractions of functional powders were 0.5%,1.0%and 1.5%.The crystallinity and semi crystallization time(t_(1/2))of the composite under different crystallization conditions were analyzed using differential scanning calorimetry(DSC).The mechanical properties of the composites were tested using a universal tensile machine.The morphological characteristics of the tensile section were observed by scanning electron microscopy.The thermal conductivity of composite materials with different mass fractions of inorganic powder was tested by the thermal conductivity tester.The results show that after adding BN and shell powder,the crystallinity of the sample increases to 18.8%and 15.3%,respectively.At 105℃,the addition of BN and shell powder with a mass fraction of 1.5%can reduce the t_(1/2)of BN/PLA and shell powder/PLA to 0.33 and 0.39 min respectively.As the mass fraction of functional powder increases,the thermal conductivity of the composite gradually increases,and compared to that of the single functional powder,the compound powder of BN and shell powder has a more significant improvement effect on the thermal conductivity of PLA,from 0.177 W/(m·K)to 0.319 W/(m·K)at the highest.The research results provide a reference for the subsequent preparation of cool feeling fiber.

关 键 词：聚乳酸 氮化硼 贝壳粉 结晶度 半结晶时间 导热系数 

分 类 号：TB33[一般工业技术—材料科学与工程]