Synthesis, Branched Structure, and Solution Property of Hyperbranched d-Glucan and d-Galactan
Synthesis, Branched Structure, and Solution Property of Hyperbranched d-Glucan and d-Galactan
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DOI：
10.1021/ma0475479
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发表时间：
2005-04
期刊：
影响因子：
5.5
通讯作者：
T. Satoh;T. Imai;Hiroyuki Ishihara;Takahiro Maeda;Y. Kitajyo;Y. Sakai;H. Kaga;Noriaki Kaneko;F. Ishii;T. Kakuchi
中科院分区：
文献类型：
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作者：
T. Satoh;T. Imai;Hiroyuki Ishihara;Takahiro Maeda;Y. Kitajyo;Y. Sakai;H. Kaga;Noriaki Kaneko;F. Ishii;T. Kakuchi
研究了1，6-脱水-β-d-吡喃葡萄糖（1）和1，6-脱水-β-d-吡喃半乳糖（2）的开环多支化聚合反应，以合成超支化多糖。在碳酸亚丙酯中的溶液聚合和使用热诱导阳离子引发剂的1和2的本体聚合通过开环反应和质子转移反应进行，得到高度水溶性的多糖，即，分别为聚1和聚2。对于相同聚合条件下的1和2的聚合物，聚-1的Mw、SLS和产率高于聚-2。在此，聚-1和聚-2被表征为分别由α-和β-连接的d-吡喃己糖基和d-呋喃己糖基重复单元、超支化d-葡聚糖和d-半乳聚糖组成的超支化多糖。此外，poly-1和poly-2具有约100%的活性。30 - 40 mol %的非还原性d-吡喃己糖基和d-呋喃己糖基末端单元，支化度约为100。0.38对于poly-1和0.44 - 0.60.
The ring-opening multibranching polymerizations of 1,6-anhydro-β-d-glucopyranose (1) and 1,6-anhydro-β-d-galactopyranose (2) have been studied in order to synthesize hyperbranched polysaccharides. The solution polymerization in propylene carbonate and the bulk polymerization of 1 and 2 using a thermally induced cationic initiator proceeded through a ring-opening reaction and a proton transfer reaction to afford highly water-soluble polysaccharides, i.e., poly-1 and poly-2, respectively. For the polymers from 1 and 2 with the same polymerization conditions, the Mw,SLS and yield of poly-1 were higher than those of poly-2. Here, poly-1 and poly-2 were characterized as hyperbranched polysaccharides consisting of α- and β-linked d-hexopyranosyl and d-hexofuranosyl repeating units, hyperbranched d-glucan and d-galactan, respectively. In addition, poly-1 and poly-2 had ca. 30−40 mol % nonreducing d-hexopyranosyl and d-hexofuranosyl terminal units, and the degree of branching was ca. 0.38 for poly-1 and 0.44−0.60...