Synthesis, Morphology and Properties of AB Crosslinked Copolymers

Bamford, C. H.; Eastmond, G. C.

doi:10.1007/978-1-4684-2874-2_7

Recent Advances in Polymer Blends, Grafts, and Blocks 1974

DOI: 10.1007/978-1-4684-2874-2_7

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Synthesis, Morphology and Properties of AB Crosslinked Copolymers

C. H. Bamford

G. C. Eastmond

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1975

1997

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Cited by 6 publications

References 12 publications

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The concentrated emulsion approach to toughened polymer composites: A review

Ruckenstein

1997

Polymer Composites

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A series of tough polymers were prepared by combining flexible with rigid chains, using the method of concentrated emulsion polymerization. The tough materials obtained can be classified into four types: [a] those prepared via the polymerization of a monomer containing a dissolved elastomer, starting from its concentrated emulsion in water; [b] those prepared via heterogeneous (interfacial) crosslinking of two partially polymerized concentrated emulsion in water containing incipient latexes; [c] those prepared as semi‐interpenetrating or AB network latexes, starting from a concentrated emulsion in water and [d] those prepared by mixing two partially polymerized concentrated emulsions and completing the polymerization. A concentrated emulsion differs from the conventional emulsion in that the volume fraction of the dispersed phase is higher than that of the most compact arrangement of monosize spheres (0.74) and can be as high as 0.99. The cells of a highly concentrated emulsion are no longer spherical, but polyhedral in shape, compactly packed and separated by thin films of continuous phase. As a result of such structure, a high polymerization rate and a high molecular weight can be achieved, the size (in the colloidal range) of the flexible phase can be controlled and the latter phase can be uniformly dispersed in the rigid one. Consequently, the concentrated emulsion method constitutes a suitable pathway to toughened composites. Owing to the compact packing of cells, the concentrated emulsion polymerization method is particularly suitable for cases in which reactions occur at the cell interface. For the materials of type [d], these reactions generate quasi‐block copolymers, which compatibilize (via “auto‐compatibilization”) the components of blends.

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The concentrated emulsion approach to toughened polymer composites: A review

Ruckenstein

1997

Polymer Composites

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The form and origin of some non‐equilibrium morphologies in multicomponent polymer blends–a brief report

Eastmond

1984

Polymer Engineering & Sci

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Morphologies and properties of polyblends. II: Blends of poly(methyl methacrylate) and a chlorine‐containing polycarbonate; effect of added copolymer

Eastmond¹,

Jiang²,

Malinconico³

1987

Brit. Poly. J.

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This paper extends our previous study of the morphology and properties of polyblends of a polycarbonate and poly(methyl methacrylate) to an investigation of the influence of small amounts of added graft copolymer. The results demonstrate that, in spite of the complexity of the molecular species involved, graft copolymers can act as effective surfactants in polymer blends. The dominant effect is to form finer dispersions of one component in the other, with commensurate increases in interfacial area. A preliminary investigation of the influence of molecular parameters in the graft copolymer is reported; in all cases the molecular weight of the poly(methyl methacrylate) in the copolymer was kept constant and greater than that of the homopolymer whereas the molecular weight of the polycarbonate was varied. Finer dispersions and greater modifications to the relaxation behaviour were found as the molecular weights of the polycarbonate blocks in the copolymer increased and became comparable with the molecular weight of the homopolymer, and as the copolymer content increased.

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Synthesis, Morphology and Properties of AB Crosslinked Copolymers

Cited by 6 publications

References 12 publications

The concentrated emulsion approach to toughened polymer composites: A review

The concentrated emulsion approach to toughened polymer composites: A review

The form and origin of some non‐equilibrium morphologies in multicomponent polymer blends–a brief report

Morphologies and properties of polyblends. II: Blends of poly(methyl methacrylate) and a chlorine‐containing polycarbonate; effect of added copolymer

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