Synthesis of Hyperbranched Polytetritol by Ring-Opening Multibranching Polymerizations of 2,3-Anhydroerythritol and 2,3-Anhydro-dl-threitol
Synthesis of Hyperbranched Polytetritol by Ring-Opening Multibranching Polymerizations of 2,3-Anhydroerythritol and 2,3-Anhydro-dl-threitol
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DOI：
10.1021/ma0481196
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发表时间：
2005-02
期刊：
影响因子：
5.5
通讯作者：
T. Imai;Yumiko Nawa;Y. Kitajyo;T. Satoh;H. Kaga;Noriaki Kaneko;T. Kakuchi
中科院分区：
文献类型：
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作者：
T. Imai;Yumiko Nawa;Y. Kitajyo;T. Satoh;H. Kaga;Noriaki Kaneko;T. Kakuchi
以三氟化硼乙醚络合物（BF_3·OEt_2）为阳离子引发剂，对2，3-脱水山梨醇（1a）和2，3-脱水-dl-苏糖醇（1b）进行了聚合。1a和1b的聚合通过开环反应和质子转移反应进行，以分别产生由dl-苏糖醇和β-葡糖单元组成的超支化碳水化合物聚合物（2a和2b）。由2a和2b的13 C NMR谱估计的支化度（DBs）分别为0.47和0.45。使用所得超支化碳水化合物聚合物的静态光散射（SLS）估计的重均分子量（Mw，SLS）值（2.67 × 105 - 3.20 × 106）显著高于使用尺寸排阻色谱（SEC）估计的重均分子量（Mw，SEC）值（1.04 × 103 - 2.77 × 103）。2a和2b在硝酸钠（NaNO 3）水溶液中的粘度非常低，并且2a和2b的特性粘度（[η]）在0.0190至0.0250 dL g-1的范围内。三...
2,3-Anhydroerythritol (1a) and 2,3-anhydro-dl-threitol (1b) were polymerized using boron trifluoride diethyl etherate (BF3·OEt2) as a cationic initiator. The polymerizations of 1a and 1b proceeded through a ring-opening reaction with a proton-transfer reaction to produce hyperbranched carbohydrate polymers (2a and 2b) consisting of dl-threitol and erythritol units, respectively. The degrees of branching (DBs) estimated by the 13C NMR spectra of 2a and 2b were 0.47 and 0.45, respectively. The weight-average molecular weight (Mw,SLS) values (2.67 × 105−3.20 × 106) estimated using static light scattering (SLS) of the resulting hyperbranched carbohydrate polymers were significantly higher than the weight-average molecular weight (Mw,SEC) values (1.04 × 103−2.77 × 103) estimated using size exclusion chromatography (SEC). The viscosities of 2a and 2b in aqueous sodium nitrate (NaNO3) solution were very low, and the intrinsic viscosities ([η]) of 2a and 2b were in the range from 0.0190 to 0.0250 dL g-1. The thre...