摘要
用ESCA技术对PVC/V2O5,PVC/MoO3,PVC/ZnO和PVC/Fe2O3体系经过210℃/3h恒温热分解后的主体骨架和过渡金属氧化物的结构演变进行了系统研究,结果表明,加入过渡金属氧化物的体系,主体骨架中有第三种结构形式的碳出现;过渡金属氧化物在反应过程中的结构变化有两种不同的形式,ZnO和Fe2O3转化为ZnCl2和FeCl3,而V2O5和MoO3则保持原结构形式不变。V2O5,MoO3,ZnO和Fe2O3对PVC的阻燃抑烟遵循两类不同的机理。
ESCA technology was used to study the structure development of PVC and transition metal oxides in PVC/V_2O_5, PVC/MoO_3, PVC/ZnO and PVC/Fe_2O_3 blends after decomposition at 210 ℃ for 3 h. The experimental results show that a third kind of carbon appeares in the main chain of PVC. Meanwhile, ZnO and Fe_2O_3 change to ZnCl_2 and FeCl_3, but V_2O_5 and MoO_3 maintain the original states. Based on these direct evidences, two different kinds of smoke-suppression mechanism of transition metal oxides (M_xO_y) filled PVC were proposed. The smoke-suppression mechanism of PVC in the presence of the first kind of M_xO_y, V_2O_5 and MoO_3, can be considered that they increase the stability of PVC by their forming complex bonds with PVC. The second kind of M_xO_y, Fe_2O_3 and ZnO, promote PVC to form more stable structures quickly by the reaction center metal chloride (MCl_x).
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2005年第3期164-168,共5页
Polymer Materials Science & Engineering
基金
国家重点基础发展规划项目(50233010)
国家863项目资助
