Acrylic Triblock Copolymers Incorporating Isosorbide for Pressure Sensitive Adhesives
Acrylic Triblock Copolymers Incorporating Isosorbide for Pressure Sensitive Adhesives
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DOI：
10.1021/acssuschemeng.6b00455
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发表时间：
2016-06-01
影响因子：
8.4
通讯作者：
Reineke, Theresa M.
中科院分区：
文献类型：
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作者：
Gallagher, James J.;Hillmyer, Marc A.;Reineke, Theresa M.
采用普通试剂，不经柱层析，两步合成了一种新的单体乙酰化丙烯酸异山梨醇（AAI）。AAI的自由基聚合得到聚（乙酰化丙烯酸异山梨醇）（PAAI），其表现出玻璃化转变温度（T-g）= 95 ℃和良好的热稳定性（T-d，5%重量损失; N-2 = 331 ℃，空气= 291 ℃）。采用可逆加成-断裂链转移（RAFT）聚合方法，以聚丙烯酸正丁酯（PnBA）或聚丙烯酸2-乙基己酯（PEHA）为低Tg中间嵌段，聚丙烯酸铝（PAAI）为高Tg末端嵌段，合成了一系列阿坝三嵌段共聚物。通过180度剥离、环粘性和静态剪切测试将范围为8-24重量% PAAI的三嵌段共聚物作为压敏粘合剂进行评价。虽然PAAI-PEHA-PAAI系列表现出较差的粘合质量，但PAAI-PnBA-PAAI系列三嵌段共聚物表现出高达2.9 N cm（-1）的剥离力，高达3.2 N cm（-1）的粘着力，并且长达10 000 min没有剪切破坏。动态力学分析表明，PAAI-PEHA-PAAI缺乏与基材形成粘合剂结合所需的耗散质量，而PAAI-PnBA-PAAI系列表现出与相关的高性能PSA一致的动态机械响应。
A new monomer acetylated acrylic isosorbide (AAI) was prepared in two steps using common reagents without the need for column chromatography. Free radical polymerization of AAI afforded poly(acetylated acrylic isosorbide) (PAAI), which exhibited a glass transition temperature (T-g) = 95 degrees C and good thermal stability (T-d, 5% weight loss; N-2 = 331 degrees C, air = 291 degrees C). A series of ABA triblock copolymers with either poly(n-butyl acrylate) (PnBA) or poly(2-ethylhexyl acrylate) (PEHA) as the low T-g midblocks and PAAI as the high T-g end blocks were prepared using Reversible Addition-Fragmentation chain Transfer (RAFT) polymerization. The triblock copolymers ranging from 8-24 wt % PAAI were evaluated as pressure sensitive adhesives by 180 degrees peel, loop tack, and static shear testing. While the PAAI-PEHA-PAAI series exhibited poor adhesive qualities, the PAAI-PnBA-PAAI series of triblock copolymers demonstrated peel forces up to 2.9 N cm(-1), tack forces up to 3.2 N cm(-1), and no shear failure up to 10 000 min. Dynamic mechanical analysis indicated that PAAI-PEHA-PAAI lacked the dissipative qualities needed to form an adhesive bond with the substrate, while the PAAI-PnBA-PAAI series exhibited a dynamic mechanical response consistent with related high performing PSAs.