http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ibtissem Moussa,Ramzi Khiari,Ali Moussa,Mohamed Naceur Belgacem,Mohamed Farouk Mhenni 한국섬유공학회 2019 Fibers and polymers Vol.20 No.5
This paper describes the use of agricultural wastes for the preparation of carboxymethylcellulose (CMC) with ahigh degree of substitution using two methods: the classic and a microwave-assisted method. A series of CMC samples withdegrees of substitution from 0.43 to 2.83 were prepared from cellulose extracted from almond shells, almond stems, and figstems by a one-step carboxymethylation reaction. The highest degree of substitution was 2.83, which corresponded to CMCfrom fig stems when butanol was used as a solvent. This CMC was easily dissolved in water and thus would provide manyopportunities for diverse applications. The obtained CMCs were characterized using different tools. Different CMC filmswere prepared using the casting method and were characterized by the determination of their mechanical properties. Theobtained results can be considered promising; they demonstrate the potential of using cellulose derivatives for the productionof transparent and strong films.
Pablo Froimowicz,Julieta I. Paez,Leandro Gerbino,Syed Nawazish Ali,Mohamed Naceur Belgacem,Alessandro Gandini,Miriam C. Strumia 한국고분자학회 2012 Macromolecular Research Vol.20 No.8
The effect of the molecular structure on the reactivity of four first-generation linear-dendritic block copolymers derived from Jeffamines and bearing amine end groups is presented and discussed. Different parameters were investigated via chemical modifications and nuclear magnetic resonance analysis, showing that chain length, hydrophilic/hydrophobic character, and flexibility of the central oligoether block did not produce any change in the amine moiety reactivity. In contrast, the type of branches and the nature of the amine end groups strongly affected the reactivity in an unusual manner. In fact, the copolymer bearing aromatic amine end groups showed better reactivity than those based on aliphatic counterparts.