Wei Lifei, Wang Rui, Zhu Zhiguo, Wang Wenqing, Wu Hanguang
Polymer Research Institute, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China.
School of Material Science and Engineering, Beijing Institute of Fashion Technology, No. A2, East Yinghua Street, Chaoyang District, Beijing 100029, China.
Materials (Basel). 2021 Mar 17;14(6):1470. doi: 10.3390/ma14061470.
Significant improvement in the fire resistance of polyethylene terephthalate (PET) while ensuring its mechanical properties is a tremendous challenge. A novel flame retardant (GO-HCCP, graphene oxide-hexachlorocyclotriphosphazene) was synthesized by nucleophilic substitution of the graphene oxide (GO) and hexachlorocyclotriphosphazene (HCCP) and then applied in PET by an in situ polymerization technique. The scanning electron microscope (SEM) showed a better dispersion of GO-HCCP than GO in the PET matrix. The char yield at 700 °C increased by 32.5% with the addition of GO-HCCP. Moreover, the peak heat release rate (pHRR), peak smoke produce rate (pSPR)and carbon monoxide production (COP)values significantly decreased by 26.0%, 16.7% and 37.5%, respectively, which indicates the outstanding fire and smoke suppression of GO-HCCP. In addition, the composites exhibited higher elastic modulus and tensile strength without compromising the toughness of PET matrix. These significantly reduced fire hazards properties are mainly attributed to the catalytic carbonation of HCCP and the barrier effect of GO. Thus, PET composites with good flame-retardant and mechanical properties were prepared, which provides a new strategy for further flame retardant PET preparation.
在确保聚对苯二甲酸乙二酯（PET）机械性能的同时，显著提高其耐火性是一项巨大挑战。通过氧化石墨烯（GO）与六氯环三磷腈（HCCP）的亲核取代反应合成了一种新型阻燃剂（GO-HCCP，氧化石墨烯-六氯环三磷腈），然后通过原位聚合技术将其应用于PET中。扫描电子显微镜（SEM）显示，GO-HCCP在PET基体中的分散性比GO更好。添加GO-HCCP后，700℃时的残炭率提高了32.5%。此外，峰值热释放速率（pHRR）、峰值产烟速率（pSPR）和一氧化碳生成量（COP）值分别显著降低了26.0%、16.7%和37.5%，这表明GO-HCCP具有出色的阻燃和抑烟性能。此外，复合材料在不损害PET基体韧性的情况下表现出更高的弹性模量和拉伸强度。这些显著降低火灾危险性的性能主要归因于HCCP的催化碳化作用和GO的阻隔效应。因此，制备了具有良好阻燃性能和机械性能的PET复合材料，为进一步制备阻燃PET提供了一种新策略。
