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The Morphology, Structure and Melting Behaviour of Cold Crystallized Isotactic Polystyrene
Marega, Carla,Causin, Valerio,Marigo, Antonio The Polymer Society of Korea 2006 Macromolecular Research Vol.14 No.6
The morphology, structure and melting behaviour of cold-crystallized isotactic polystyrene (iPS) were studied by differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD) and small angle X-ray scattering (SAXS). The polymer was found to crystallize according to the dual-lamellar stack model. The two populations of lamellae, along with a melting-recrystallization phenomenon, determined the appearance of multiple melting peaks in DSC traces. The annealing peak was attributed to the relaxation of a rigid amorphous phase, rather than to the melting of crystalline material.
정보라,박병대,Valerio Causin 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
This study investigated impacts of the synthesis method and melamine content of urea-melamine-formaldehyde (UMF) resins to their cohesive and interphase features, and adhesion in bonding woodproducts. Melamine at three addition levels was simultaneously reacted with urea and formaldehyde toobtain melamine-urea-formaldehyde (MUF) resins, while melamine at the same levels was initiallyreacted with formaldehyde and then with urea to prepare melamine-formaldehyde-urea (MFU) resins. As the melamine content increased, molecular weights, curing peak temperature, activation energy,bond-line thickness, E0max, and adhesion strength of wood products increased. These results indicatedthat the cohesive features of these resins mainly affected the adhesion strength in wood products whilethe interphase features had a partial contribution to the adhesion.
Park, Byung-Dae,Causin, Valerio Institute of Agricultural Science and Technology 2013 慶北大農學誌 Vol.31 No.4
As a renewable nanomaterial, cellulose nanocrystal (CNC) isolated from wood grants excellent mechanical properties in developing high performance nanocomposites. This study was undertaken to compare the reinforcing efficiency of two different CNCs, i.e., cellulose nanowhiskers (CNWs) and cellulose nanofibrils (CNFs) from hardwood bleached kraft pulp (HW-BKP) as reinforcing agent in polyvinyl alcohol (PVA)-based nanocomposite. The CNWs were isolated by sulfuric acid hydrolysis while the CNFs were isolated by 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation. Based on measurements using transmission electron microscopy, the individual CNWs were about $6.96{\pm}0.87nm$ wide and $178{\pm}55nm$ long, while CNFs were $7.07{\pm}0.99nm$ wide. The incorporation of CNWs and CNFs into the PVA matrix at 5% and 1% levels, respectively, resulted in the maximum tensile strength, indicating different efficiencies of these CNCs in the nanocomposites. Therefore, these results suggest a relationship between the reinforcing potential of CNCs and their physical characteristics, such as their morphology, dimensions, and aspect ratio.
Nanang Masruchin,박병대,Valerio Causin 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
This study investigated effects of sonication treatment on characteristics and drug release behavior ofhydrogels prepared by supramolecular cellulose microfibrils (CMFs) isolated by 2,2,6,6-tetramethylpi-peridine-1-oxyl radical (TEMPO)-mediated oxidation which made carboxylate negative charge availableon the CMFs’ surface. The hydrogels were fabricated by inducing ionic interactions between negativelycharged CMFs and a positive metal ion (Al3+). The sonication time showed no influence on thecarboxylate content of CMFs, but it greatly influenced characteristics and drug release behavior of thehydrogels. These results indicate that the sonication time has an impact on hydrogels’ characteristics anddrug release behavior.
Cellulose fibril-based hydrogels for drug release system
박병대,( Nanang Masruchin ),( Valerio Causin ) 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Cellulose fibrils such as cellulose nanofibrils (CNF) and cellulose microfibrils (CMF) from hardwood pulp were isolated by 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO) mediated oxidation to obtain negatively charged carboxylate on their surfaces that have been used to induce nanogels and microgels through ionic interactions. Characteristics of these two types of hydrogels were analyzed to evaluate their influence to the drug release behavior of the hydrogels. First, morphology, chemical structure, mechanical properties, surface area, and pore size of both nanogels and microgels were characterized by various methods. Both hydrogels prepared by the trivalent cation resulted in the highest stiffness and compressive strength than those of the other hydrogels prepared by mono- or di-valent cations. The nanogels induced by the trivalent cation also showed the highest swelling ratio and the lowest release of the drug.