Electron‐beam processing of destructurized allylurea–starch blends: Immobilization of plasticizer by grafting
作者： Danielle Ruckert , Fr�d�ric Cazaux , Xavier Coqueret
DOI: 10.1002/(SICI)1097-4628(19990718)73:3<409::AID-APP12>3.0.CO;2-Z
关键词: Materials science 、 Potato starch 、 Starch 、 Fourier transform infrared spectroscopy 、 Thermoplastic 、 Composite material 、 Thin film 、 Electron beam processing 、 Grafting 、 Plasticizer
摘要: Allylurea (AU) was used as a reactive additive with poor aptitude to homopolymerization for obtaining grafted plasticized starch films stabilized physical properties. Potato mixed AU (30-50 parts per hundred/pph) in mixer operating at 125°C. Upon storage well-defined hygrothermal conditions, the resulting thermoplastic material shows strong plasticizer migration revealed by crystals blooming samples surface and exhibits opacity assigned phase separation of organic inside material. Freshly prepared appropriate thickness were exposed 175-kV electron beam (EB) radiation inducing covalent grafting free radical process. FTIR monitoring chemical changes thin AU-starch blends indicates unambiguously transformation ofAU allylic bond. High irradiation doses are required achieving complete conversion blend. However, no detectable observed intermediate conversion, probably consequence higher solubility polysaccharide. Examination viscoelastic properties dynamic mechanical thermal analysis that artificial aging placing alternatively high low relative humidity (RH) atmosphere does not significantly alter thermomechanical spectrum reconditioned cell 58% RH.
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