Miscible polymer blends: 2. Kinetics of the high pressure crystallization of poly(ethylene oxide) and poly(vinylidene fluoride) in blends with poly(methyl methacrylate)

Chitosan has been used to form miscible, biodegradable blends with hydrophilic synthetic polymers as PVA and PEO. Characterisation of the blends by DSC, IR and microscopy analysis was made giving much attention to possible interactions of molecular polar group in the polymer chains. PVA/chitosan are found to be amorphous in the whole range of composition having one glass transition temperature. Molecular interactions in the pair of polymers are connected with amide group of chitosan and hydroxyl groups of PVA. PEO/chitosan blends stay amorphous up to 0.2 weight fraction of PEO. For a higher amount of PEO that polymer crystallises forming a spherulite crystalline structure. We correlate the overall kinetics of crystallisation and melting behaviour of solid, semicrystalline blends PEO/chitosan in the form of thin films for a set of PEO species of different blend composition with a morphological structure of the blends. Negative values of the Flory‐Huggins interaction parameter due to specific interactions by hydrogen bonding through ether group of PEO and hydroxyl group of chitosan were evaluated. Amide groups do not participate in the molecular interaction between PEO and chitosan molecules. Avrami equation was applied to describe kinetics of crystallisation of pure PEO and PEO/chitosan blends of various compositions.

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Simulations of polymer crystallization under high pressure

Ito

Tsutsumi

Minagawa

et al. 1995

Colloid Polym Sci

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Miscible polymer blends: 2. Kinetics of the high pressure crystallization of poly(ethylene oxide) and poly(vinylidene fluoride) in blends with poly(methyl methacrylate)

Cited by 5 publications

References 7 publications

Modification of properties of epoxy polymers by high hydrostatic pressure

Modification of properties of epoxy polymers by high hydrostatic pressure

Characterisation and morphology of biodegradable chitosan / synthetic polymer blends

Simulations of polymer crystallization under high pressure

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