振动场控制玻璃纤维增强聚丙烯的性能

Control on properties of FRPP by vibration field

利用低频振动注射成型装置,研究了振动场对30%玻璃纤维增强聚丙烯(FRPP)注射试样的力学性能及形态结构的影响。增加振动频率,注射试样的力学性能增强效果不大;增加振幅,试样拉伸屈服应力提高10%。振动场诱导玻璃纤维沿振动场方向取向,采用振动注射工艺,FRPP中生成了β、γ晶型:高振频、低振幅注射有有利于生成β晶型;低振频、高振幅振动注射有利于生成γ晶型。

The authors studied the effect of vibration field on mechanical properties and morphological structure of 30% glass fiber reinforced polypropylene （FRPP） by means of a low frequency vibration injection-molding device. Increasing vibration frequency resulted in little enhancement in mechanical properties of the injection- moulded specimen whereas raising vibration amplitude increased the tensile yield stress by 10%. The vibration field induced the glass fibers to orientate themselves along the vibration direction. The β-phase and γ-phase crystals oeeurred in FRPP when utilizing the vibration injection molding proeess. Injection moulding at high vibration frequency and low vibration amplitude favors the formation of β-phase crystals; injection moulding at low vibration frequency and high vibration amplitude facilitates the growth of γ-phase crystals.