4种商用聚丁烯材料的结构与性能对比

Structure and performance comparison among four commercial polybutylene materials

选取4种商用聚丁烯(PB)材料,采用傅里叶变换红外光谱仪(FT-IR)、核磁共振仪(13C NMR)、X线衍射仪(XRD)、差示扫描量热仪(DSC)以及凝胶渗透色谱仪(GPC)对其微观结构进行表征,同时对其密度、熔体流动速率(MFR)、灰分、氧化诱导期(OIT)、力学性能以及静液压进行测定,对其结构和性能进行对比分析。结果表明:4种聚丁烯材料均为稳定的晶型Ⅰ,熔点均在115℃左右,其中丁烯-乙烯共聚物的最大结晶度为70.96%,最高结晶温度为92℃;4种聚丁烯材料的密度和熔体流动速率差别不大,PB-1的氧化诱导期最长(138.42 min),表现出最好的耐热氧老化性能。均聚聚丁烯-1材料(PB-1、PB-2、PB-3)具有更好的力学性能,管道材料的静液压均满足使用要求,其中PB-1的力学性能和耐内压性能最好;丁烯-乙烯共聚物材料(PB-4)具有更好的韧性。

Microstructure of four polybutylene materials were characterized by Fourier transform infrared spec⁃trum(FT⁃IR),carbon nuclear magnetic resonance(13C NMR),X-ray diffraction(XRD),differential scanning calorimeter(DSC)and gel permeation chromatography(GPC).Their application performance were also tested for density,melt flow rate(MFR),ash content,oxidative induction time(OIT),tensile strength and tube hy⁃drostatic.The results indicated that these four kinds of polybutylene-1 materials exhibited stable crystal form I,and among which,the crystallinity and crystallization temperature of ethylene-butylene copolymer was the highest(70.96%).The results also indicated that there was no obvious difference in density and MFR for these four polybutylene materials,while the heat-oxygen age stabilities of Basell grey polybutene was the best with a OIT of 138.42 min.The homopolymer of polybutylene-1(PB-1,PB-2,PB-3)led to better mechanical proper⁃ties,the internal pressure resistance of pipes manufactured from these three kinds of PB-1 materials met the re⁃quirements of application,and among which,PB-1 showed the best mechanical properties and internal pres⁃sure resistance.The ethylene-butylene copolymer led to better flexibility properties.