摘要
研究了聚丙烯材料通过稳定剂改性后的熔体状态与在热或光照环境下的老化行为规律。研究结果表明,当聚丙烯熔体中仅掺入抗氧剂时,熔体稳定性只说明材料的可加工性,并不能完全代表它长期耐热效果;当熔体中掺入了光稳定剂和抗氧剂的协同组合体系,不仅熔体状态稳定,且长期耐光老化效果优良,所以聚丙烯的树脂-加工-材料-老化行为是一个整体过程,不仅取决于配合体系的协同效应,还取决于材料加工时的熔体状态。本研究系统跟踪了4组试样在进行人工光(氙灯)加速试验过程中羰基指数变化与试样所接受的紫外辐射累积能量值之间的关联性。结果表明,在聚丙烯光氧老化过程中羰基,选取羰基指数来表征聚丙烯材料光氧老化程度既准确又可靠。
Polypropylene modified with stabilizers on melt state and aging performance under heat-resistance test(140 ℃) or irradiating test(Xenon Lamp) was studied. The results indicate that melt stability only shows material′s processability while antioxidants are added alone, no showing that it keeps heat resistance in long run test. The materials possess melt stability and good irradiation resistance effect at the same time only as UV stabilizers and antioxidants in synergism. The resin-processing-materials-aging behavior is as a whole process, if depends on both of synergistic formula system and melt state in processing. Carbonyls are increasing with aging time increasing in photooxidation on polypropylene, so it is accurate and reliable to select carbonyl index demonstrating photooxidation level on polypropylene. Based on successive investigation in the reactivity between change of carbonyl index and accumulated UV irradiation energy, four group samples were selected with acceleration test (Xenon Lamp). A regression equation Y=a+bX(Y——carbonyl index was published; X——accumulated UV irradiation energy MJ/m^2; a and b are experimental constants, change with different species). The relation coefficient r of four regression lines pass beyond 0.9, be satisfactory.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2005年第3期145-147,共3页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(5989141-3)
关键词
聚丙烯环境适应
羰基指数
行为规律
polypropylene environmental adaptability
carbonyl index
behavior rule
