高压处理对聚丁烯-1/聚丙烯共混物结晶结构及力学性能的影响  

Effect of High Pressure on Crystallization Structure and Mechanical Properties of Polybutene-1 and Polypropylene Blends

作　　者：张效琳 李贞印 魏聪 施智勇 王亚明[1] 刘春太[1] 申长雨[1] 邵春光[1] Xiao-lin Zhang;Zhen-yin Li;Cong Wei;Zhi-yong Shi;Ya-ming Wang;Chun-tai Liu;Chang-yu Shen;Chun-guang Shao(National Engineering Research Center for Advanced Polymer Processing Technology,Zhengzhou University,Zhengzhou 450002)

机构地区：[1]郑州大学、橡塑模具国家工程研究中心,郑州450002

出　　处：《高分子学报》2023年第12期1925-1934,共10页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号52273027)资助项目.

摘　　要：利用广角X射线、示差扫描量热仪和电子扫描显微镜研究了不同压力下聚丁烯-1/聚丙烯(iPB-1/iPP)共混物的结晶情况.结果表明,较高的压力能够有效抑制iPB-1和iPP的相分离,细化iPB-1富集区的尺寸,从而抑制iPB-1中form Ⅱ的生长,为form Ⅰ’的生成争取空间;高压下产生的γ-iPP晶能够诱导form Ⅰ’成核,促进form Ⅰ’的生成,且共混物中生成的form Ⅰ’结构更稳定,能够在较高的压力范围内(200~500 MPa)稳定存在.较小尺寸的iPB-1富集区、form Ⅰ’相iPB-1以及γ-iPP的形成,能够提高iPB-1/iPP共混制品的断裂强度和断裂伸长率,改善其力学性能.When polymer melts crystallize under high pressure,they often exhibit completely different crystallization behaviors from atmospheric crystallization.This difference is not only manifested in crystallization kinetics,but also in the crystal structure of the product.The crystallization behavior of iPB-1/iPP blends under different pressure was studied by means of wide-angle X-ray diffraction(WAXD),differential scanning calorimeter(DSC)and scanning electron microscopy(SEM)in this study.The results showed that under higher pressure the phase separation of iPB-1 and iPP was effectively inhibited,and the size of the phase domain of iPB-1 was reduced,thus the nucleation and growth of form Ⅱ in iPB-1 was inhibited,which was benefit for the formation of form Ⅰ’.At the same time,γ-iPP crystal could also induce the nucleation of form Ⅰ’.The synergy of high pressure and γ-iPP could also further improve the structural stability of form Ⅰ’of iPB-1,and make form I'phase stable under the high pressure range from 200 MPa to 500 MPa.In iPB-1/iPP blends,the smaller phase domain of iPB-1,the formation of form I'and γ-iPP could improve the breaking strength and elongation at break of products,therefore improve their mechanical properties.

关 键 词：聚丁烯-1/聚丙烯共混物 高压结晶 结构稳定性 力学性能 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]