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유인섭,서관호,황성욱,심진기 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.3 No.3
Starch has been considered as an attractive biopolymer because of its low cost, low density, and biodegradability. However, its poor compatibility with other polymers is drawback, and many researches were performed to overcome this in the polymer blends. Gelatinization, a technique to enhance miscibility among polymers, has been intensively studied due to its better processability than starch. Poly (Butylene Succinate) (PBS) is one of the promising biodegradable polymers due to its excellent mechanical properties and processability, but the softness, flexibility, and relatively high cost also give a limitation for various industrial applications. Blending with low-price resins become an alternative approach to resolve those problems to improve mutual physical properties. Recently, biopolymers derived from renewable resources have received much attention to manufacture the biodegradable blends. This study was performed to examine in depth the effect of starch and gelatinized starch on the physical and mechanical properties of PBS/ starch binary blends. It was confirmed that PBS/TPS blends were immiscible having poor compatibility. 30 phr of glycerol had relatively more gelatinization effect, and the mechanical property of PBS/TPS blend became poor as the content of TPS increased. Furthermore, PBS/GTPS blends were better than PBS/EGTPS in the mechanical property due to plasticization degree.
Marchiafava Bignami Disease Potentially Complicating Normal Pressure Hydrocephalus
이상학,유인섭,이경회,양현덕 대한치매학회 2014 Dementia and Neurocognitive Disorders Vol.13 No.1
Marchiafava-Bignami disease (MBD) is a rare disorder of demyelination or necrosis of the corpus callosum. Mainly, MBD is associated with alcohol and malnutrition. We report a 60-year-old woman with no history of alcohol consumption or malnutrition who had MBD as a possible complication of normal pressure hydrocephalus (NPH). The patient presented with a 2-month history of progressive gait unsteadiness, urinary incontinence, and forgetfulness, for which the patient underwent ventriculoperitoneal shunt surgery with remarkable improvement. Magnetic resonance imaging (MRI) demonstrated hyperintensity in the body and splenium of corpus callosum when she was brought to the hospital again with rapid deterioration of her mental ststus. It might be postulated that cerebrospinal fluid (CSF) tumor necrosis factor-alpha (TNF-α) might have contributed to the development of MBD although not measured in this patient, given that TNF-α, as a proinflammatory cytokine mediating demyelinating process have been found in be increased in the CSF of NPH.