Search results for "Dimethylacetamide"
showing 3 items of 23 documents
CCDC 1896308: Experimental Crystal Structure Determination
2019
Related Article: Arun Pal, Santanu Chand, Joan Cano Boquera, Francesc Lloret, Jian-Bin Lin, Shyam Chand Pal, Madhab C. Das|2019|Inorg.Chem.|58|6246|doi:10.1021/acs.inorgchem.9b00471
Continuous polymer fractionation of polysaccharides using highly substituted trimethylsilylcellulose
1998
Trimethylsilylcellulose (TMSC) was prepared from commercial cellulose with a mixture of hexamethyldisilazane and chlorotrimethylsilane in the solvent system N,N-dimethylacetamide/lithium chloride. The soluble, highly silylated polymer (degree of substitution, DS 2.9) had a molar mass M, of 500 kg/mol and a molecular non-uniformity U = (M w /M n )- 1 of 2.9. In order to investigate the principal suitability of a continuous polymer fractionation for polysaccharides like cellulose derivatives and to obtain TMSC with different molecular weights and lower non-uniformity TMSC was fractionated by means of CPF (Continuous Polymer Fractionation), well-established in the field of synthetic polymers. …
Basis for the Preparative Fractionation of a Statistical Copolymer (SAN) with Respect to Either Chain Length or Chemical Composition
2003
The possibilities to fractionate copolymers with respect to their chemical composition on a preparative scale by means of the establishment of liquid/liquid phase equilibria were studied for random copolymers of styrene and acrylonitrile (SAN). Experiments with solutions of SAN in toluene have shown that fractionation does in this quasi-binary system, where demixing results from marginal solvent quality, take place with respect to the chain length of the polymer only. On the other hand, if phase separation is induced by a second, chemically different polymer, one can find conditions under which fractionation with respect to composition becomes dominant. This opportunity is documented for th…