http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Kinetics and Mechanisms of Emulsion Polymerization
Nomura, Mamoru 한국공업화학회 2004 Journal of Industrial and Engineering Chemistry Vol.10 No.7
The current understanding of the kinetics and mechanisms of batch and continuous emulsion homoand co-polymerizations is summarized from the viewpoints of particle formation and growth. There are numerous factors that affect these processes; among them, studies on the radical transfer and the monomer partitioning between phases, which are key factors for particle formation and growth, are reviewed and discussed. Attention is also focused on the effects of initiator type, additives and impurities in the recipe ingredients, and agitation, each of which sometimes exert crucial influences on the processes of particle formation and growth.
Absorption of Orally Administered Hyaluronan
Mamoru Kimura,Takuya Maeshima,Takumi Kubota,Hitoshi Kurihara,Yasunobu Masuda,Yoshihiro Nomura 한국식품영양과학회 2016 Journal of medicinal food Vol.19 No.12
Hyaluronan (HA) has been utilized as a supplement. However, the absorption of orally administrated HA remains controversial. The degradation and absorption of HA in the intestine were investigated in this study. HA excretion into the feces, degradation in the intestinal tract, absorption through the large intestine, and translocation to the blood and skin were examined. HA administered orally was not detected in rat feces. HA was degraded by cecal content, but not by artificial gastric juice and intestinal juice. Oligosaccharide HA passed through excised large intestine sacs. Furthermore, disaccharides, tetrasaccharides, and polysaccharides HA were distributed to the skin of rats following oral administration of high molecular weight HA (300 kDa). The results of the study suggest that orally administered HA is degraded to oligosaccharides by intestinal bacteria, and oligosaccharide HA is absorbed in the large intestine and is subsequently distributed throughout the tissues, including the skin.
Shin Jin-Sup,Lee Jung-Min,Suzuki Kiyoshi,Nomura Mamoru,Cheong In-Woo,Kim Jung-Hyun The Polymer Society of Korea 2006 Macromolecular Research Vol.14 No.4
The kinetic behavior of emulsion polymerizations of styrene in the presence of sulfonated N-hydroxy ethyl aniline (SHEA) was investigated with two initiators: 2,2'-azobisisobutyronitrile (AIBN) and potassium persulfate (KPS). SHEA was synthesized using a stepwise polyurethane reaction method from 3-hydroxy-1-propane sulfonic acid sodium salt, isophorone diisocyanate (IPDI), and N-(2-hydroxyethyl) aniline. Stable core-shell poly(styrene/sulfonated N-hydroxy ethyl aniline, St/SHEA) latex particles were successfully prepared by using an appropriate amount of AIBN, in which SHEA plays the role of 'surfmer', i.e., acting as both a surfactant in the emulsion polymerization and a monomer in the chemical oxidative polymerization. The kinetic behavior was dissimilar to that of typical emulsion polymerization systems. A long inhibition period and low rate of polymerization were observed due to radical loss by the oxidative polymerization of SHEA. It was concluded, due to the low water-solubility of AIBN and retardation reaction by SHEA, that the initial loci of polymerization were monomer droplets. However, growing polymer particles as polymerization loci became predominant as polymerization proceeded. It was suggested that AIBN was more effective than KPS in the preparation of the core-shell type poly(St/SHEA) latex particles. With KPS, no substantial polymerization was observed in any of the samples.