摘要
利用自行研制的两种振动注射装置,研究振动频率对等规聚丙烯机械性能的影响。振动频率的提高有利于试样屈服强度增加,并存在一个最大值,在强度峰值之后,振动频率的增加使屈服强度的变化不大,但总是大于常规注射得到的屈服强度值;较低的振动频率使断裂伸长率降低,之后振动频率增加有利于断裂伸长率提高;振动频率的增加明显提高冲击强度(对于振动注射I,频率大于4.17Hz,冲击强度变化不大)。可见,振动注射可以实现聚丙烯自增强的同时自增韧。
The effect of vibration frequency on the mechanical properties of isotactic polypropylene prepared by vibration injection molding (VIM) was investigated. The tensile strength, elongation at break and impact strength as a function of vibration frequency were measured in tensile and impact tests, respectively. The tensile strength increased to a maximum value with the vibration frequency, the elongation at break is also raised produced by vibration injection molding at high vibration frequency, the vibration frequency obviously betters impact strength, but when the frequency is beyond 4.17 Hz, VIM-I makes the strength stand at platform. The conditions of vibration injection molding, to get self-reinforcing and self-toughening polypropylene at the same time, have been found at high vibration frequency. The mechanical properties of polypropylene can be improved via vibration injection molding.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
2004年第6期55-58,共4页
Journal of Sichuan University (Engineering Science Edition)
基金
国家自然科学基金资助项目(20174026
54473053)
关键词
振动注射
聚丙烯
自增强
自增韧
Impact testing
Mechanical properties
Polypropylenes
Tensile strength
Toughening
