Browsing by Author "Chin, HC"

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Reactive compatibilization of PET/LCP blends by a multifunctional epoxy coupler
(1997-06-01)
Chin, HC
;
Chang, FC
;
應用化學系
;
Department of Applied Chemistry
A commercially available tetra-functional epoxy monomer has demonstrated to be a highly efficient reactive compatibilizer in compatibilizing the immiscible and incompatible polymer blends of poly(ethylene terephthalate) (PET) and liquid crystalline polymer (LCP). This multi-functional epoxy monomer is able to react with both base polymers simultaneously as a coupling agent to form the desirable epoxy-co-PET-co-LCP mixed copolymer. This mixed copolymer possessing segments of PET and LCP tends to reside at the interface to reduce the interfacial tension in the melt and the size of the resultant phase domains. Additionally, the presence of this epoxy compatibilizer enhances the formation of greater numbers and finer dimension of the in situ-formed LCP fibrils. It requires only a very small amount of the epoxy monomer, a few fractions of one percent, to improve drastically the mechanical properties of the PET/LCP blends. The compatibilization mechanism by this multi-functional epoxy monomer acting as a coupling agent has been discussed in detail. (C) 1997 Elsevier Science Ltd.
Reactive compatibilization of the poly(ethylene terephthalate) liquid crystalline polymer blends by solid epoxy resin as a coupling agent
(1996-06-27)
Chin, HC
;
Chiou, KC
;
Chang, FC
;
應用化學系
;
Department of Applied Chemistry
A selected reactive coupling agent can be served as an effective compatibilizer for certain immiscible and incompatible blends should both blend constituents possess the necessary functional groups that can react with the coupling agent at comparable rates. Solid epoxy resin with two epoxide endgroups per molecule was demonstrated to be an efficient reactive compatibilizer for the incompatible blends of poly(ethylene terephthalate) (PET) and co-polyester liquid crystalline polymer (LCP) by functioning as a coupling agent. The main chain structure of the epoxy resin is neither identical nor miscible with PET and LCP and tends to reside at interface during melt mixing. This preferential residence gives the epoxy compatibilizer greater opportunity to react with both PET and LCP simultaneously to produce the in situ-formed epoxy-b-PET-b-LCP mixed copolymer. This in situ-formed mixed copolymer is highly effective in compatibilizing the PET/LCP blends. This reactive epoxy compatibilizer enhances the LCP fibril formation and results in substantial improvements on stiffness and toughness of the PET/LCP blends. (C) 1996 John Wiley & Sons, Inc.
Reactive compatibilization of the poly(ethylene terephthalate) liquid crystalline polymer blends by solid epoxy resin as a coupling agent
(1996-06-27)
Chin, HC
;
Chiou, KC
;
Chang, FC
;
應用化學系
;
Department of Applied Chemistry
A selected reactive coupling agent can be served as an effective compatibilizer for certain immiscible and incompatible blends should both blend constituents possess the necessary functional groups that can react with the coupling agent at comparable rates. Solid epoxy resin with two epoxide endgroups per molecule was demonstrated to be an efficient reactive compatibilizer for the incompatible blends of poly(ethylene terephthalate) (PET) and co-polyester liquid crystalline polymer (LCP) by functioning as a coupling agent. The main chain structure of the epoxy resin is neither identical nor miscible with PET and LCP and tends to reside at interface during melt mixing. This preferential residence gives the epoxy compatibilizer greater opportunity to react with both PET and LCP simultaneously to produce the in situ-formed epoxy-b-PET-b-LCP mixed copolymer. This in situ-formed mixed copolymer is highly effective in compatibilizing the PET/LCP blends. This reactive epoxy compatibilizer enhances the LCP fibril formation and results in substantial improvements on stiffness and toughness of the PET/LCP blends. (C) 1996 John Wiley & Sons, Inc.