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JIANG Ming, CAO Xianyi, YU Tongyin. SOME ASPECTS OF MORPHOLOGIES AND INTERFACES IN COPOLYMER/HOMOPOLYMER BLENDS*[J]. Chinese Journal of Polymer Science,
;1988, 6(4): 345-352.
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Based on a series of morphological studies of blends of homopolymer (Homo) and a variety of block and graft copolymers (Cop), the nature of phase separation, interface, emulsification and inner morphology of copolymer-dispersed phase etc. in the blends are discussed. In the cases of Cop AB/Homo A/Homo B systems, in which one homopolymer forms matrix, it is observed that the dispersed homopolymer phase is exclusively associated with Cop AB, i.e. no Homo A-Homo B interface exists. This phenomenon is believed to be caused by minimizing the interfacial energy of the systems.Meanwhile,preferential solubilization or anchoring of the like chains of copolymer into homopolymer matrix leads to stabilization of the dispersed phase in the matrix.In addition,regular variation of the inner morphology of the dispersed copolymer phase with the composition and molecular parameters of the component polymers is observed.When the two components have comparable proportions,alternating concentric shells are the most common feature which is associated with minimizing the interfacial energy in the Cop/Homo systems.
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