摘要
以马来酸酐、苯胺和氧化镧为原料合成了N-苯基马来酰胺酸根合镧(Ⅲ)。对产品进行了红外光谱分析及其物性常数测定,通过刚果红法和热重法对其PVC热稳定性进行评价。结果表明,N-苯基马来酰胺酸根(OA)合镧(Ⅲ)为淡黄色粉末,熔点181℃,其化学组成符合La(OA)3.H2O,酰胺氮和羧基氧与镧离子发生了配位作用。配合物对PVC的热稳定性良好,可作为PVC的热稳定剂使用,当稳定剂加入量为PVC的2.5%时,稳定时间可达到31min,热失重温度提高30℃;并且与硬脂酸钙之间有明显的协同作用,当配合物与硬脂酸钙按质量(1+3)形成的复合物的加入量为PVC的2.5%时,对PVC的稳定时间可以达到38min,热失重温度提高60℃。该化合物主要通过镧与PVC中活泼的Cl反应和其有机部分的稳定作用来提高PVC的热稳定性。
The complex of lanthanum （ Ⅲ） with Nphenyl maleamic acid was synthesized by the reaction of maleic anhydride, aniline and lanthanum. Some physical and chemical constants and infrared spectra were measured. The thermal stability of PVC in the presence of the complex was studied by Congo method and TG. The results showed that the complex of lanthanum （Ul） with N-phenyl maleamic acid is light yellow powder, and its melting point is 181℃. The chemical formula of the complex agreed with La（ OA）3 .H2O, where the N of amide group and O of earboxy group coordinated with lanthanum. The complex could be used as a thermal stabilizer for PVC due to its good effect on thermal stability of PVC. When the additive quantity of complex to PVC was 2.5% （mass fraction） of PVC, the stability time achieved 31 rain and the temperature of mass loss increased by 30℃. The synergetic effect of the complex with calcium stearate was obvious. When the additive quantity of the complex with calcium stearate （1 ＋ 3 ） was 2.5% of PVC, the stability time to PVC changed to 38 min and the temperature of mass loss increased by 60 ℃. The increase of thermal stability of PVC in the presence of the complex was due to the reaction of lanthanum with labile chlorine of PVC and the organic part of the complexes.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2009年第4期460-463,共4页
Journal of the Chinese Society of Rare Earths
基金
陕西省教育厅自然科学专项(06JK241)
高分子材料工程国家重点实验室开放课题基金资助
