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Stable polymer brushes with effectively varied grafting density synthesized from highly crosslinked random copolymer thin films

机译:由高度交联的无规共聚物薄膜合成的具有有效改变接枝密度的稳定聚合物刷

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We demonstrate the synthesis of poly(methyl methacrylate) (PMMA) and poly(styrene- b -methyl methacrylate) (P(S- b -MMA)) brushes on crosslinked random copolymer thin films, compositionally varied poly(styrene- r -glycidyl methacrylate) (P(S- r -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- r -GMA) via surface-initiated atom transfer radical polymerization. The grafting densities of the PMMA and P(S- b -MMA) brushes were effectively controlled to be in different density regimes by controlling the composition of P(S- r -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- r -GMA) thin films enables close examination of the morphology of thermally annealed P(S- b -MMA) brushes in different grafting density regimes.
机译:我们证明了在交联的无规共聚物薄膜上聚甲基丙烯酸甲酯(PMMA)和聚苯乙烯-b-甲基丙烯酸甲酯(P(S-b-MMA))刷子的合成,组成变化的聚(苯乙烯-r-缩水甘油基)甲基丙烯酸酯(P(Sr-GMA)),可以在交联时用具有引发剂基团的分子进一步官能化以形成高度稳定的薄膜。通过精心的优化,PMMA刷通过表面引发的原子转移自由基聚合反应,成功地从引发剂官能化的P(Sr -GMA)表面生长。通过控制P(Sr -GMA)的成分和后交联功能化方法,可以有效地将PMMA和P(Sb -MMA)刷子的接枝密度控制在不同的密度范围内。合成的BCP刷子即使在高接枝密度下,在重复洗涤和热退火过程中也很稳定,这突出表明交联的P(S-r-GMA)薄膜具有出色的稳定性,因此可以仔细检查热退火P(S-b-)的形貌。 MMA)刷子在不同的接枝密度范围内。

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