Kang Hyungoo, An Sol, Lee Woo Jung, Kang Ga Ryang, Kim Sangwon, Hur Su-Mi, Paeng Keewook, Kim Myungwoong
Department of Chemistry and Chemical Engineering, Inha University Incheon 22212 Republic of Korea
Department of Chemistry, Sungkyunkwan University Suwon 16419 Republic of Korea
RSC Adv. 2018 Jul 3;8(43):24166-24174. doi: 10.1039/c8ra04480e. eCollection 2018 Jul 2.
We demonstrate the synthesis of poly(methyl methacrylate) (PMMA) and poly(styrene--methyl methacrylate) (P(S--MMA)) brushes on crosslinked random copolymer thin films, compositionally varied poly(styrene--glycidyl methacrylate) (P(S--GMA)), which can be further functionalized with a molecule featuring an initiator group upon crosslinking to form highly stable thin films. With careful optimizations, PMMA brushes were successfully grown from the surfaces of initiator functionalized P(S--GMA) surface-initiated atom transfer radical polymerization. The grafting densities of the PMMA and P(S--MMA) brushes were effectively controlled to be in different density regimes by controlling the composition of P(S--GMA) and post-crosslinking functionalization methods. Synthesized BCP brushes were stable upon repetitive washing and thermal annealing processes even at high grafting density, highlighting that the outstanding stability of crosslinked P(S--GMA) thin films enables close examination of the morphology of thermally annealed P(S--MMA) brushes in different grafting density regimes.
我们展示了在交联无规共聚物薄膜上合成聚甲基丙烯酸甲酯（PMMA）和聚（苯乙烯 - 甲基丙烯酸甲酯）（P(S - MMA)）刷，该薄膜是组成可变的聚（苯乙烯 - 甲基丙烯酸缩水甘油酯）（P(S - GMA)），在交联时可以用具有引发基团的分子进一步功能化以形成高度稳定的薄膜。通过仔细优化，在引发剂功能化的P(S - GMA)表面引发的原子转移自由基聚合作用下，成功地从其表面生长出PMMA刷。通过控制P(S - GMA)的组成和后交联功能化方法，有效控制了PMMA和P(S - MMA)刷的接枝密度处于不同的密度范围。即使在高接枝密度下，合成的BCP刷在重复洗涤和热退火过程中仍保持稳定，这突出表明交联P(S - GMA)薄膜的出色稳定性使得能够在不同接枝密度范围内仔细研究热退火后的P(S - MMA)刷的形态。
