摘要
采用热重分析(TGA)研究了充油SEBS体系的热稳定性,通过分析拉伸强度变化研究了共混体系的耐紫外性能,并用红外光谱(FT-IR)研究了经紫外辐照后体系的化学结构变化。TGA结果表明,白油的加入导致SEBS热稳定性下降,15#、26#和32#白油构成的SEBS(YH-602)填充体系的起始失重温度由纯SEBS的413.8℃分别下降到184.4℃、218.7℃和238.5℃,最大失重速率温度由441.2℃分别下降到436.4℃、434.7℃和436.0℃。充油SEBS的耐紫外性能随白油用量的增加而降低,70phr 15#、26#和32#白油填充SEBS(YH-602)的拉伸强度保留率分别为84.34%、70.07%和97.35%,而190phr的分别为68.55%、65%和77.24%。经紫外辐照后试样表面的FT-IR谱图在3300 cm-1、1720 cm-1和1164 cm-1附近出现吸收峰,显示老化降解后新增基团主要为羧酸类和脂肪族酯类。
TGA was adopted to research the thermal stability of mineral oil-extended （styrene-ethylene/butylenesstyrene） tri-block copolymer （SEES） blends. Tensile strength retention is taken as the appraisal target to study the UV aging resistance performance. FT-IR was used to understand the chemical constitution changes of system after the irradiation. TGA results indicate that the thermal stability of the SEBS declines because of adding mineral oil. Initial weight loss temperature of YH-602 added with 15#, 26# and 32# （70） is 184.4 ℃, 218.7 ℃ and 238.5℃ respectively, lower than that of the pure SEES（413.8 ℃ ）. The maximum decomposition temperature of their blends lowers to 436.4 ℃ 434.7 ℃ and 436.0 ℃ respectively, compared with that of the pure SEBS（441.2 ℃ ）. UV aging results show the aging resistance of oil-extended SEES blends is reduced with the oil use level increasing. After irradiation, the tensile strength retention rate of YH-602 added with 15#, 26# and 324. of 70 phr is 84.34%, 70.07% and 97.35% respectively, but the tensile strength retention rate with 15#, 26# and 32# of 190 phr is 68.55 % ,65 % and 77.24 %, respectively. The FT-IR absorption peaks appear around 3300 cm^-1 1720 cm^-1 and 1164 cm^-1 after UV irradiation, indicating that the main newly increased groups after aging and degradation are carboxylic acid and aliphatic ester groups.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2013年第9期36-39,共4页
Polymer Materials Science & Engineering
基金
克拉玛依石化公司资助项目
