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    Chemical hybridization of waterborne polyurethane with beta-cyclodextrin by sol-gel reaction

    Year: 2017

    Journal: Prog. Org. Coat., Volume 111, OCT, page 107–111

    Authors: Lee, Dae Sub; Hur, Pilho; Kim, Byung Kyu

    Organizations: Korea Research Foundation [2015R1D1A1A01057903]

    Keywords: Waterborne polyurethane; beta-cyclodextrin; Sol-gel reaction; Biodegradation; Chemical hybrids

    A series of waterborne polyurethane (WPU)/beta-cyclodextrin (beta-CD) chemical hybrids were synthesized from polypropylene glycol (PPG400), dicyclohexylmethane-4,4'-diisocyanate (H12MDI), dimethylol butanoic acid (DMBA), 3-isocyanatepropyltriethoxysilane (ICPTES), and beta-CD. The ICPTES-terminated WPU prepolymers were chain extended via a sol-gel reaction by using beta-CD as a biodegradable multifunctional crosslinker at various beta CD equivalence ratios (ICPTES:beta-CD = 1:0.5, 1:1, 1:1.5, and 1:2). The thermal, mechanical, and surface properties of the WPU/beta-CD dispersion cast film were investigated, with biodegradation experiments carried out in alpha-amylase enzyme solution. The glass transition temperature (Tg), particle size, Young's modulus, and hardness of the dispersion cast film increased up to an equivalence ratio of 1:1.5 owing to effective migration of beta-CD molecules into WPU and crosslinking via the sol-gel reaction. However, at higher ratios, most of these parameters decreased owing to aggregation of beta-CD.
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