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通过高温熔融法制备了高密度聚乙烯/超高分子量聚乙烯(HDPE/UHMWPE)共混物,采用脆断面SEM和振荡剪切流变测试研究了退火处理前后共混物的微观形貌与流变行为。结果表明:UHMWPE用量的增加,使共混物断面的UHMWPE丝状物结构逐渐增多,且显著提高体系的储能模量,而退火处理后丝状物消失,模量有所提高;随着UHMWPE用量的增加,UHMWPE长链与体系存在临界缠结浓度(c_e),并与储能模量(G’)、损耗模量(G’’)、复数黏度(|η~*|)有一定的标度关系(浓度低于c_e时:G’~c~(0.2)、G’’~c~(0.07)、|η~*|~c~(0.07);浓度高于c_e时:G’~c~(1.20)、G’’~c~(0.6)、|η~*|~c~(0.64));退火处理后,UHMWPE因解缠结而与体系结合能力更强,说明退火处理能够强化UHMWPE对HDPE的增强作用。
The HDPE / UHMWPE blends were prepared by high temperature melting method. The microstructure and flow of the blends before and after annealing were studied by means of SEM and oscillatory shear rheological tests. Change behavior. The results show that the increase of UHMWPE content increases the structure of UHMWPE filaments in the cross-section of the blends and significantly increases the storage modulus of the blends. However, the filaments disappear and the modulus increases after annealing. As UHMWPE The critical entanglement concentration (c_e) of the UHMWPE long chain and system is increased with the increase of the dosage, and it is also related to the storage modulus (G ’), loss modulus (G’ ’) and complex viscosity (| η ~ * |) Scale relationship (at concentrations below c_e: G ’~ c ~ (0.2), G’ ~ c ~ (0.07), | η ~ * | ~ c ~ (0.07) η ~ * | ~ c ~ (0.64)). After annealing, UHMWPE has more binding ability to the system due to the disentanglement, which shows that the annealing treatment can Reinforced UHMWPE enhances HDPE.