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根据高密度聚乙烯/碳酸钙(HDPE/CaCO_3)复合体系中各种相界面的特征,把CaCO_3和偶联剂之间通过某种物理化学作用所形成的相界面称之为第1相界面,把偶联剂和HDPE基体之间通过缠绕等作用所形成的相界面称之为第2相界面,考察了反应性偶联剂和助偶联剂对HDPE/CaCO_3复合体系中第2相界面的强化作用及其对复合体系增韧效果的影响。结果表明,反应性偶联剂和助偶联剂在体系中的反应可实现对偶联剂分子链的延长,其结果不仅使HDPE树脂的脆韧转变提前,而且使HDPE/CaCO_3复合体系的韧性大大提高,最高可达基体树脂的12倍左右;CaCO_3对HDPE树脂的增韧行为主要受偶联剂的种类和CaCO_3的添加方法的影响,在使用同种偶联剂处理的情况下,基体树脂的韧性等因素均不会改变其对HDPE树脂的增韧效果和倾向;在本研究使用反应性偶联剂和助偶联剂的条件下,发现基体树脂的分子量较低时,HDPE/CaCO_3复合体系的缺口冲击强度提高较大。
According to the characteristics of various phase interfaces in high density polyethylene / calcium carbonate (HDPE / CaCO_3) composite system, the phase interface formed by some physical and chemical interaction between CaCO_3 and coupling agent is called the first phase interface, The phase interface between the coupling agent and the HDPE matrix through the action of winding is called the second phase interface. The effects of the reactive coupling agent and the coupling aid on the interface of the second phase in the HDPE / CaCO 3 composite system Strengthening effect and its effect on toughening effect of composite system. The results showed that the reaction of the reactive coupling agent and the auxiliary coupling agent in the system can prolong the molecular chain of the coupling agent. The results not only advance the brittleness-toughness transition of the HDPE resin, but also make the toughness of the HDPE / CaCO_3 composite system greatly Increase, up to 12 times the matrix resin; CaCO_3 of HDPE resin toughening behavior mainly by the type of coupling agent and CaCO_3 addition method, the use of the same coupling agent treatment, the matrix resin Toughness and other factors will not change its HDPE resin toughening effect and tendency; in this study the use of reactive coupling agent and coupling agent under the conditions, found that when the matrix resin molecular weight is low, HDPE / CaCO_3 composite system The notched impact strength is greater.