The effect of POSS-based block copolymer as compatibilizer on POSS/epoxy composites
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In this study, a novel hybrid block copolymer containing POSS (BCP), poly(methacrylisobutyl-POSS)-b-poly(methylmethacrylate) (PMAiBuPOSS-b-PMMA) was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization. The structure and molecular weight were characterized via 1H NMR and GPC. BCP was creatively used as the compatibilizer to overcome the bad compatibility of epoxy and POSS in their blend system. SEM and dynamic mechanical thermal analyses (DMTA) were used to observe the surface morphology and thermal–mechanical behaviors of the resultant products. We found that the amount of microaggregation domains of POSS decreased, while the nano ones increased, when BCP content increased. All the aggregation domains were distributed in epoxy matrix uniformly at nanoscale with the addition of 10 phr BCP and 5 phr POSS monomers. The results indicated that BCP could effectively improve the compatibility between epoxy resin and POSS owing to its amphiphilicity in DGEBA. The fracture behavior of products transformed from brittle fracture to ductile fracture gradually with the increase of BCP, whereas the Tg and E9 decreased. I. INTRODUCTION
Organic/inorganic nanocomposites possess the advantage of the two original compounds by making full use of the synergistic effect between the organic and inorganic components. The nanosized dispersed inorganic phase largely enhances the interfacial interactions, which gives rigidity and good stability. While the presence of the organic phase gives a certain excellent properties of organic material, such as light weight, flexibility, ductility, and impact strength. Organic/inorganic nanocomposite study has become one of the most active fields in polymer material research. POSS possesses many excellent properties, such as nanosize effects, excellent thermal stability, and molecular designable ability, because of its special microhybrid structures. Thus, POSS offers opportunities to modify polymer in molecular level and has potential use in compatibilizing organic and inorganic materials. At first, POSS has only been added to polymer by physical blending. With the development of POSS functionalization, POSS has also been introduced to polymer by chemical bonding methods.1 Physical blending, because of its convenience, is an important way for industrialization of POSS nanocomposites.
Contributing Editor: Linda S. Schadler Address all correspondence to these authors. a) e-mail: [email protected] b) e-mail: [email protected] DOI: 10.1557/jmr.2014.364 266
J. Mater. Res., Vol. 30, No. 2, Jan 28, 2015
http://journals.cambridge.org
Downloaded: 05 Mar 2015
However, what makes it hard for POSS to disperse in polymer matrix at molecular level is its ability to crystallize and agglomerate.2 Obviously, the dispersed state of POSS is an important factor affecting the performance of POSS-based nanocomposites. On the other hand, the compatibility between POSS and the matrix could be enhanced by special processing methods or strong interactions.3–8 Functional groups appended to th
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