论文部分内容阅读
近年来,在聚合物成型过程中,熔体振动技术引起了高聚物研究者的广泛重视。采用自行研制的低频振动注射装置,在聚合物常规注射成型过程中叠加振动场,控制聚合物的凝聚态结构,从而提高制品力学性能。实验的研究对象为HDPE/LDPE共混体系。研究表明:振动注塑有利于试样增强增韧,与常规注塑试样相比,振动注塑试样拉伸强度最大增幅为53.7%,冲击强度最大增幅为55.4%。采用SEM、WAXD、DSC等方法对试样微观形态结构进行表征,发现试样中大分子链高度取向,并有串晶生成。此外,振动注塑还有利于HDPE和LDPE发生共结晶。
In recent years, melt polymer technology has drawn the attention of polymer researchers. The self-developed low-frequency vibration injection device is used to superpose the vibration field in the conventional polymer injection molding process to control the condensed state structure of the polymer to improve the mechanical properties of the product. The experimental research object is HDPE / LDPE blend system. The results show that vibration injection molding is beneficial to toughening and toughening of samples. Compared with conventional injection molded samples, the maximum tensile strength and the maximum impact strength are 53.7% and 55.4% respectively. SEM, WAXD, DSC and other methods were used to characterize the microstructure of the sample. It was found that the macromolecular chains in the sample were highly oriented with the formation of string crystals. In addition, vibration injection molding is also beneficial to HDPE and LDPE co-crystallization occurs.