论文部分内容阅读
以聚丙烯(PP)/碳酸钙为研究对象,以复合材料界面为着眼点,探讨了不同的填料粒径和表面组成对复合材料光氧老化的影响,并提出了相关机理.首先,文中认为聚合物/无机填料界面面积与界面化学组成是影响老化速率的关键因素.聚合物与碳酸钙的总界面面积的增大会加速PP的光氧老化,不同偶联剂处理会改变碳酸钙的表面化学特性进而对PP老化产生促进或抑制.在此基础上提出了基于界面的老化反应速率概念及相应模型.其次,在老化领域采用了“界面放大”的实验方案,验证了碳酸钙对PP的老化促进很大程度上来源于碳酸钙表面的化学组成.此外,研究发现采用表面处理剂钛酸酯改性的碳酸钙能大大促进PP的老化,且表现为钛酸酯与碳酸钙的协同效果.
Taking polypropylene (PP) / calcium carbonate as the research object and the interface of the composite material as the focus, the effects of different filler particle size and surface composition on the photooxidation and aging of composites were discussed and the relevant mechanisms were proposed.Firstly, Polymer / inorganic filler interfacial area and interfacial chemical composition are the key factors affecting the aging rate.The increase of the total interfacial area of polymer and calcium carbonate will accelerate the photooxidation aging of PP, and the different coupling agents will change the surface chemistry of calcium carbonate Characteristics and then promote or inhibit the aging of PP.On the basis of this, the concept and corresponding model of aging reaction rate based on interface are put forward.Secondly, the experiment scheme of “interface amplification” is adopted in the field of aging, and the effect of calcium carbonate on PP Of the aging promotion is largely due to the chemical composition of the surface of calcium carbonate.In addition, the study found that the use of surface treatment agent titanate-modified calcium carbonate can greatly promote the aging, and the performance of titanate and calcium carbonate synergy effect.