CAJ | 학술논문

采用"核-壳"型硅橡胶对聚碳酸酯(PC)回收料进行增韧及阻燃改性,考察了该共混体系的力学性能、阻燃性能、断裂面形貌及热稳定性.研究表明:两相小相容导致"核-壳"型硅橡胶与PC回收料共混没有增韧效果.只有添加环氧树脂或苯乙烯-马来酸酐共聚物作为增容剂,其缺口冲击强度才能获得大幅提高.冲击断裂面形貌观察显示:增容剂能有效提高"核-壳"型硅橡胶的聚甲基丙烯酸酯壳与PC基体间的界面黏结性,降低两相表面张力,使硅橡胶粒子在基体中获得单分散分布,这是取得优异增韧效果的关键因素;并根据实验结果分析了增韧机理."核-壳"型硅橡胶不仅可以有效地增韧PC回收料,也能显著提高其阻燃性能.在共混物燃烧过程中,硅橡胶能迅速迁移到PC表面,形成高阻燃性的炭保护层;同时在PC基体与硅橡胶之间形成交联结构,从而对PC回收料产生阻燃作用.因此,添加质量分数为7%的"核-壳"型硅橡胶和3%的增容剂,就可使PC回收料的阻燃级别达到UL94V-0级.
채용"핵-각"형규상효대취탄산지(PC)회수료진행증인급조연개성,고찰료해공혼체계적역학성능、조연성능、단렬면형모급열은정성.연구표명:량상소상용도치"핵-각"형규상효여PC회수료공혼몰유증인효과.지유첨가배양수지혹분을희-마래산항공취물작위증용제,기결구충격강도재능획득대폭제고.충격단렬면형모관찰현시:증용제능유효제고"핵-각"형규상효적취갑기병희산지각여PC기체간적계면점결성,강저량상표면장력,사규상효입자재기체중획득단분산분포,저시취득우이증인효과적관건인소;병근거실험결과분석료증인궤리."핵-각"형규상효불부가이유효지증인PC회수료,야능현저제고기조연성능.재공혼물연소과정중,규상효능신속천이도PC표면,형성고조연성적탄보호층;동시재PC기체여규상효지간형성교련결구,종이대PC회수료산생조연작용.인차,첨가질량분수위7%적"핵-각"형규상효화3%적증용제,취가사PC회수료적조연급별체도UL94V-0급.
Toughening and flame retardance modification for recycled polycarbonate (PC) was studied by using core-shell structure silicon rubber. The mechanical properties, flame retardance, fracture surface morphology, and thermal stability of the recycled PC blends were investigated. Result showed the recycled PC blends cannot be toughened due to the incompatibility between the PC and core-shell structure silicon rub-ber. However, the notched impact strength can only be improved significantly with epoxy resin or styrene ma-leic anhydride copolymer as a compatibilizer. Observing the fracture surface morphology presented that the compatibilizer enhanced the interfacial adhesion between two phases, reduced the interfacial tension, and in-troduced monodispeme distribution which was the key factor for the excellent toughing effect. Besides, the toughing mechanism was analyzed according to the test result. The core-shell structure silicon rubber could enhance the flame retardant as well as roughed the recycled PC significantly. In the burning process, the sili-con rubber could moved to the PC surface fast, and formed a high flame retardant carbon protection layer; al-so, it formed cross linking structure between PC matrix and silicon rubber to act flame retardant for the recy-cled PC. So, the blends containing 7 wt% core-shell structured silicon rubber and 3 wt% compatibilizer can achieve a UL94 V-0 rating in vertical burning test.