摘要
以β-环糊精(BC)为成核剂,通过微孔注塑发泡工艺制备了发泡聚丙烯(PP)复合材料。采用差示扫描量热仪(DSC)、扫描电子显微镜(SEM)等技术,研究了不同含量BC(0.25%~7%,质量分数,下同)对发泡聚丙烯复合材料发泡性能及力学性能的影响。结果表明:随着BC的加入,PP的发泡性能得到明显改善。添加7%的BC可以得到理想的泡孔形貌,泡孔直径为27.17μm,密度达1.23×10^7 cell/cm^3。BC的加入使PP的结晶温度、结晶速率、粘度均有明显改善,有利于PP在更高温度下结晶并防止泡孔坍塌和并泡。与发泡聚丙烯材料相比,发泡PP/BC复合材料的拉伸、弯曲、冲击强度分别提高了21.2%、7%、12%。
In this study,polypropylene(PP)foamed composite was prepared usingβ-cyclodextrin(BC)as nucleating agent through a microcellular injection molding foaming process.The paper studied the effect of different contents of BC(0.25%-7%)on foamed PP composite’s foaming properties and mechanical properties by electron microscopy and differential scanning calorimeter.The results showed that the foaming behavior of PP was significantly improved with the BC content increasing.When BC content was 7%,the ideal cell morphology was obtained,the average diameter was 27.17μm and the density was 1.01×10^7 cell/cm^3.It was found that the crystallization temperature,crystallization rate of PP could be obviously improved by adding BC,which was advantageous to the crystallization of PP at higher temperature,and prevented the cell collapsing and dipping.Compared with polypropylene foaming materials,the tensile,bending and impact strength of foamed PP/BC composites increased by 21.2%,7%and 12%respectively.
作者
张恒
周玉惠
张飞
龚维
何力
ZHANG Heng;ZHOU Yuhui;ZHANG Fei;GONG Wei;HE Li(The Institute of Materials and Metallurgy,Guizhou University,Guiyang 550025,China;The Institute of Materials and Construction,Guizhou Normal University,Guiyang 550025,China;National Engineering Research Center for Compounding and Modification of Polymer Materials,Guiyang 550014,China)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2020年第4期148-152,165,共6页
Materials Reports
基金
黔科合人才[2016]5673号
黔科服企[2018]4010号
黔科合平台人才[2017]5788号~~
关键词
聚丙烯
微孔发泡
Β-环糊精
发泡性能
力学性能
复合材料
polypropylene
microcellular foam
β-cyclodextrin,foaming property
mechanical properties
composite materials
