Polymer ( IF 4.6 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.polymer.2020.123088 Marketa Ilcikova , Monika Galeziewska , Miroslav Mrlik , Josef Osicka , Milan Masar , Miroslav Slouf , Marcin Maslowski , Milan Kracalik , Robert Pietrasik , Jaroslav Mosnacek , Joanna Pietrasik
A new concept of utilization of particle-polymer hybrids as multifunctional additives for polymer blends was introduced in this study. Graphene oxide particles with short densely grafted polystyrene brushes (GO-g-PS) were prepared by surface-initiated atom transfer radical polymerization (SI-ATRP). Melt rheology studies revealed that GO-g-PS suppressed the phase separation of miscible poly(methyl methacrylate)/poly(styrene-co-acrylonitrile) (PMMA/SAN) blends. The studies suggested specific interactions of GO-g-PS with the PMMA phase and this was confirmed based on calculations of activation energies of segmental relaxations by broadband dielectric spectroscopy (BDS). These unusual interactions of GO-g-PS with PMMA phase were assigned to the specific and precise architecture of the GO-g-PS particles as well as chemical nature of PS polymer brushes. The short chains of PMMA and PS provide miscibility originating from UCST behavior of PMMA/PS blend of short polymer chains. Additionally, BDS also revealed improved charge transport in PMMA/SAN blend in presence of GO-g-PS hybrid.
中文翻译:
氧化石墨烯接枝的短聚苯乙烯刷对可混溶的PMMA / SAN混合物行为的影响
在这项研究中引入了一种新的概念,即利用颗粒-聚合物杂化体作为聚合物共混物的多功能添加剂。通过表面引发的原子转移自由基聚合(SI-ATRP)制备了具有短密接枝聚苯乙烯刷(GO- g -PS)的氧化石墨烯颗粒。熔体流变学研究表明,GO- g -PS抑制了可混溶的聚(甲基丙烯酸甲酯)/聚(苯乙烯-co-丙烯腈)(PMMA / SAN)共混物的相分离。研究表明,GO- g -PS与PMMA相具有特定的相互作用,这是通过宽带介电谱(BDS)计算段弛豫的活化能而得到证实的。GO- g的这些异常相互作用具有PMMA相的-PS被指定为GO- g -PS颗粒的特定且精确的结构以及PS聚合物刷的化学性质。PMMA和PS的短链提供了可混溶性,这是由于短聚合物链的PMMA / PS共混物的UCST行为引起的。另外,BDS还揭示了在GO- g -PS杂化物存在下,PMMA / SAN共混物中电荷传输的改善。