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采用具有高活性端基的膨胀型阻燃剂3,9-二氯-2,4,8,10-四氯代-3,9-二磷螺环-3,9-二氧-[5.5]-十一烷(SPDPC)-己二胺共聚物(PSPHD)对海泡石纤维(SEP)进行阻燃化接枝改性,并对改性海泡石纤维(PSPHD-SEP)的结构及热性能进行了SEM、TEM、XPS、FTIR、XRD、TGA和DTG测试。采用熔融共混制备了SEP/LDPE(低密度聚乙烯)和PSPHD-SEP/LDPE复合材料。SEM和TEM显示,接枝前后海泡石纤维表面形貌有明显变化。XPS、FTIR和XRD分析表明,阻燃齐聚物PSPHD通过与SEP表面羟基反应对其进行阻燃接枝改性,这对SEP纤维的结构有一定影响,但并未造成结构的根本破坏。TGA和DTG测试分析表明,阻燃接枝改性改变了海泡石纤维的热分解历程,证明在海泡石表面确实发生了接枝反应。当PSPHD-SEP的质量分数为5%时,PSPHD-SEP/LDPE复合材料的极限氧指数值(LOI)可达23。
The use of intumescent flame retardant 3,9-dichloro-2,4,8,10-tetrachloro-3,9-diphosphaspirocyclo-3,9-dioxo- [5.5] (SPDPC) - hexamethylenediamine copolymer (PSPHD) on the flame retardant grafting modification of sepiolite fiber (SEP). The structure and heat of the modified sepiolite fiber (PSPHD-SEP) Performance SEM, TEM, XPS, FTIR, XRD, TGA and DTG tests. SEP / LDPE (low density polyethylene) and PSPHD-SEP / LDPE composites were prepared by melt blending. SEM and TEM showed that the surface morphology of sepiolite fibers before and after grafting changed significantly. The results of XPS, FTIR and XRD showed that the flame-retardant oligomer PSPHD was modified by flame-retardant graft copolymerization with SEP surface hydroxyl groups, which had some influence on the structure of SEP fibers but did not cause the fundamental destruction of the structure. The results of TGA and DTG tests showed that the flame-retardant graft modification changed the thermal decomposition course of sepiolite fibers, which proved that grafting reaction did occur on the sepiolite surface. When PSPHD-SEP mass fraction is 5%, the limit oxygen index value (LOI) of PSPHD-SEP / LDPE composites can reach 23.