支链羟基官能化SBS的制备及在改性沥青中的应用  

Preparation of Hydroxyl Functionalized SBS and Its Application in Modified Asphalt

作　　者：李雪坤[1,2] 陈国顺[1] 杨维成[1] 段敏伟[1] 唐颂超[2] 曹亚东 罗勇[1] 

机构地区：[1]上海化工研究院聚烯烃催化技术与高性能材料国家重点实验室,上海200062 [2]华东理工大学材料科学与工程学院上海市先进聚合物材料重点实验室,上海200237 [3]上海城建日沥特种沥青有限公司,上海200231

出　　处：《精细化工》2017年第5期555-561,共7页Fine Chemicals

摘　　要：以聚苯乙烯-聚丁二烯-聚苯乙烯嵌段共聚物(SBS)为原料,巯基乙醇(MCH)为改性剂,偶氮二异丁腈(AIBN)为引发剂,利用巯基-烯加成接枝反应,制备出支链羟基官能化SBS(SBS-g-OH)。通过FTIR、~1HNMR、TGA表征了产品的结构和性能,考察了反应时间、温度和巯基乙醇用量对官能度的影响、官能度对SBS-g-OH相对分子质量及聚丁二烯(PB)段1,2-C=C和1,4-C=C双键结构的影响。另外,探究了不同官能度的SBS-g-OH对提高改性沥青稳定性的影响。结果表明:当m(SBS)∶m(MCH)∶m(AIBN)=5∶1∶0.01时,在80℃下反应3 h可得官能度(FD)为24.07%的SBS-g-OH,且羟基主要接枝在SBS的PB段1,2-C=C双键上,该官能度的改性沥青离析程度最小,储存稳定性提高最为明显。A series of branched styrene-butadiene-styrene triblock copolymer （SBS-g-OH） bearing hydroxyl groups were prepared via the thiol-ene radical addition reaction between styrene-butadiene- styrene triblock copolymer （SBS） and mercaptoethanol （MCH） with azodiisobutyronitrile （AIBN） as the initiator. The structure and property of products were characterized by FTIR, 1HNMR and TGA. The effects of reaction time, reaction temperature and amount of mercaptoethanol on degrees of functionality （FD） were investigated. The effects of degree of functionality on molecule weight of SBS- g-OH and 1, 2-C=C and l, 4-C ：C units in polybutadiene （PB） chains were also studied. Furthermore, the effects of various SBS-g-OH on the improvement of stability of modified asphalt were discussed. The results showed that the product with a degree of functionality of 24.07% was achieved under the conditions of m（SBS） ：m（MCH） ：m（AIBN） = 5：1：0.01, at 80℃ for 3 h, and hydroxyl group was mainly grafted onto the 1,2-C =C double bond of PB chains in SBS-g-OH. The segregation experiment demonstrated that the addition of SBS-g-OH （ FD = 24.07% ） could make the modified asphalt have the minimum degree of segregation and obviously improved thermal storage stability of modified asphalt.

关 键 词：SBS 巯基-烯加成反应 羟基改性 改性沥青 存储稳定性 橡塑助剂 

分 类 号：TQ334.9[化学工程—橡胶工业]