Consequently, a variety of compatibilizers have been developed and applied for immiscible polymer blends. However, most commercial polymer blends are immiscible because of their high molecular weights and unfavorable interactions, and, thus, form multiphase structures. Polymer blending has become an important way to prepare new high-performance polymeric materials over the past 40 years. It was further found that RC–SG-compatibilized PVDF/PLLA blends exhibit higher mechanical properties than the RC–MMG-compatibilized blends. The co-continuous structure obtained by RC–SG was also more stable than that by RC–MMG. Moreover, RC–SG induces a wider co-continuous interval range than RC–MMG. In the PVDF/PLLA (50/50) blends, 1 wt.% poly(styrene-co-glycidyl methacrylate)-graft-poly(methyl methacrylate) (RC–SG) tuned the morphology from the droplet-in-matrix structure to the co-continuous structure, while the blends with poly(methyl methacrylate-co-glycidyl methacrylate)-graft-poly(methyl methacrylate) (RC–MMG) kept the sea-island structure with even 3 wt.% loading. It was found that both compatibilizers can improve the compatibility between the PLLA and PVDF, with different compatibilization effects. PS is immiscible with both PLLA and PVDF, while PMMA is miscible with PVDF. Two reactive-comb compatibilizers with polystyrene (PS) and polymethylmethacrylate (PMMA) as main chains and PMMA as the side chains have been synthesized. We investigated the influence of the compatibilizer-main-chain structure on the compatibilizing effect for immiscible poly(vinylidene fluoride)/poly(L-lactic acid) (PVDF/PLLA) blends. Extensive study related to the architectural effects of compatibilizer on the compatibilization has mainly focused on the side chains. The compatibilizer with double comb structure has a superior compatibilizing effect for immiscible polymer blends due to the symmetrical structure on both sides of main chains.
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