As naturai polymers, chitin and chitosan had many unique physical, chemical and biological characteristics. By chemical modification, chitin and chitosan could gain more useful properties. The derivatives and composite materials from chitin and chitosan were summerized.
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The efforts were made to improve its stabilities by chemical modification.
为了提高其稳定性，对其进行了改性。
By chemical modification, chitin and chitosan could gain more useful properties.
通过化学改性，甲壳素和甲壳胺可以获得更多的性能。
Hydrophilic groups were introduced onto E-51 epoxy resin by chemical modification method to prepare epoxy resin aqueous system.
利用化学改性法将亲水性基团引入E - 51环氧树脂链上，经冰乙酸成盐并加水制备改性树脂水性体系。
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