低频振动对iPP注塑试样性能的影响  

THE EFFECT OF LOW FREQUENCY VIBRATION ON PROPERTIES OF iPP MOLDING SAMPLES

作　　者：张杰[1] 申开智[1] 李又兵[1] 

机构地区：[1]四川大学高分子科学与工程学院四川大学高分子材料工程国家重点实验室,四川成都610065

出　　处：《高分子材料科学与工程》2004年第3期144-147,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金重点基金(29934070);高校博士点基金(2000061021);国家重点基础研究专项基金(J1999064809)联合支助

摘　　要：采用独特的压力振动注射装置,研究了不同熔体温度下,振动频率、振动压力对iPPF401注塑试样拉伸强度、冲击强度的影响,并对试样进行维卡软化温度和WAXD的测试。结果表明,随着振动频率和振动压力的增加,拉伸强度和冲击强度提高。拉伸强度的最大增幅为26.1%。在特定的振动工艺条件下,冲击强度产生跃升,最大增幅达168%,其原因是在此条件下试样有晶型变化,即除α晶外,还有β晶和γ晶生成。当振动频率较高时,试样的维卡软化温度有明显升高(6℃～8℃)。In this paper, the effect of vibration frequency and vibration pressure on tensile strength and impact strength of iPP F401 vibration molding samples were studied using unique pressure vibration injection device. Furthermore, vicat softening temperature and WAXD measurements were conducted. The result shows that tensile strength and impact strength increase as the increase of vibration frequency and vibration pressure. The maximum increment of tensile strength is (26.1%). The impact strength will take a leap under certain process conditions, the maximum increment is (168%). It is because of emerge of β-PP or γ-PP in addition to α-PP. The vicat softening temperatures of samples obtained at high vibration frequency have a range of increment of 6 ℃～8 ℃.

关 键 词：低频振动 等规聚丙烯 晶型 压力振动注射装置 冲击强度 注射成型工艺 

分 类 号：TQ320.662[化学工程—合成树脂塑料工业]