甲基丙烯酸酯树脂的热裂解机理

Thermal Degradation Mechanism of Methacrylate Resins

研究了以甲基丙烯酸酯端基不饱和聚酯树脂为主链 ,用甲基丙烯酸甲酯取代苯乙烯作为交联剂制成的甲基丙烯酸酯树脂 (MAER)与通用型不饱和聚酯树脂 (GUPR)的热裂解机理、燃烧现象。结果表明 :MAER的裂解产物中苯环化合物含量 (1 4.9% )少于 GUPR(74.5% )。MAER燃烧时的发烟量和毒性也远低于 GUPR。在 MAER中加入三水合氧化铝 (ATH)后 ,裂解产物中有毒物质的种类和数量更少 ,在燃烧时只有少量白烟 ,并具有很好的阻燃性能。ATH填充的 MAER复合材料在燃烧时无烟产生。

The thermal degradation of polymer materials is an important step in burning process. The smoke and toxicity in burning relate to variety and quantity of the thermal degradation products. Therefore the study on the thermal degradation mechanism can guide molecule design of flame retardant resins. Methacrylate resin (MAER) is made up of methacrylate terminals in unsaturatd polyester resin as main chain and was methyl methacrylate instead of styrene as crosslinking agent. The thermal degradation mechanism and combustion phenomenon of MAER and general unsaturated polyester resins (GUPR) were studied in this paper. The results show that the aromatic ring compound content (14.9%) of MAER thermal degradation products is less than 74.5% of GUPR. Therefore the smoke generation and toxicity of MAER is lower than GUPR. The MAER filled by alumina trihydrate (ATH) has much lower smoke generation and toxicity than unfilled MAER. When MAER composite filled by ATH is burning, no smoke is observed.