STUDIES ON CHITIN-BASED LIQUID CRYSTALLINE POLYMERS——THE LYOTROPIC LIQUID CRYSTALLINITY OF LOW MOLECULAR WEIGHT CHITOSAN AND THE INFLUENCE OF MOLECULAR MASS ON CRITICAL CONCENTRATION

DONG Yanming; HUANG Xunting; ZHAO Yaqing; YANG Liulin; MAO Wei; BI Danxia; ZHAO Lianjun

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STUDIES ON CHITIN-BASED LIQUID CRYSTALLINE POLYMERS——THE LYOTROPIC LIQUID CRYSTALLINITY OF LOW MOLECULAR WEIGHT CHITOSAN AND THE INFLUENCE OF MOLECULAR MASS ON CRITICAL CONCENTRATION

Research Article | 更新时间：2021-03-19

- STUDIES ON CHITIN-BASED LIQUID CRYSTALLINE POLYMERS——THE LYOTROPIC LIQUID CRYSTALLINITY OF LOW MOLECULAR WEIGHT CHITOSAN AND THE INFLUENCE OF MOLECULAR MASS ON CRITICAL CONCENTRATION
- Acta Polymerica Sinica Issue 1, Pages: 16-20(2006)
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- Published：20 February 2006，
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DONG Yanming, HUANG Xunting, ZHAO Yaqing, YANG Liulin, MAO Wei, BI Danxia, ZHAO Lianjun. STUDIES ON CHITIN-BASED LIQUID CRYSTALLINE POLYMERS——THE LYOTROPIC LIQUID CRYSTALLINITY OF LOW MOLECULAR WEIGHT CHITOSAN AND THE INFLUENCE OF MOLECULAR MASS ON CRITICAL CONCENTRATION. [J]. Acta Polymerica Sinica (1):16-20(2006)
DOI：

DONG Yanming, HUANG Xunting, ZHAO Yaqing, YANG Liulin, MAO Wei, BI Danxia, ZHAO Lianjun. STUDIES ON CHITIN-BASED LIQUID CRYSTALLINE POLYMERS——THE LYOTROPIC LIQUID CRYSTALLINITY OF LOW MOLECULAR WEIGHT CHITOSAN AND THE INFLUENCE OF MOLECULAR MASS ON CRITICAL CONCENTRATION. [J]. Acta Polymerica Sinica (1):16-20(2006) DOI：

摘要

研究了两种用酶降解法得到的低分子量壳聚糖样品(CS1和CS2)的溶致液晶性.用GPC并辅以质谱法确定了两样品的数均相对分子质量为622和2311g/mol.在相对分子质量低至622的低分子量壳聚糖(相当于四糖)水溶液中仍发现了溶致液晶现象

并确定出相对分子质量为622和2311的低分子量壳聚糖液晶临界浓度为73%和36%(W/W%)

这些结果与已报道的中、高分子量壳聚糖液晶临界浓度随分子量升高而降低的基本规律是一致的.实验结果与经典的KS理论预测值不符

因为低分子量壳聚糖的相对分子质量超过了KS理论对高分子临界浓度的预测范围.

Abstract

The lyotropie liquid crystallinity of two low molecular weJisht chitosan samples prepared by enzymic decomposition was investigated．The number averge molecular masses of those two samples CSl and CS2 were 622 and 231 l g／m01．measured by means of GPC and MS．ne lyotropic liquid crystalline behavior was found for these samDles eyen when the molecular mass was as low as 622 g／mol(～tetramer)．The critical concentration of CSl and CS2 to form liquid crystalline phase was determined to be 73 wt％and 36 wt％respectively．The results agree with the Drincipie rule deduced from chitosans with high and medium molecular mass

which states tllat山e critical concentration increases with the decrease of molecular mass．However the resuhs were not aceordant with those Dredietd by the traditional Khokhlov．Semenov(KS)theory

because山e molecular lnass of the samples is out of the region in which KS theory can be used．

关键词

低分子量壳聚糖溶致液晶液晶临界浓度

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