Catalyst and method for performing carboxyl reaction on C6 of bacterial cellulose

Abstract

The invention discloses a TEMPO / soluble chlorite / soluble pypocholoride catalytic system for performing a carboxyl reaction on C6 of a bacterial cellulose, and the soluble chlorite is a main catalyst. The invention further discloses a method for performing the carboxyl reaction on the C6 of the bacterial cellulose. The TEMPO / soluble chlorite / soluble pypocholoride catalytic system serves as the catalyst of the carboxyl reaction of the C6 of the bacterial cellulose, a product of COOH after the reaction is high in content, and yield is greatly increased. Crystallinity degree and a micro state of BC after the reaction are not changed, oxidation only occurs to the C6 position of the BC, and Cs at the other positions are not influenced. The soluble chlorite in the system is the main catalyst and is sold and bought in a solid form, is easy to store, use amount is easy to control. A product after the reaction cannot become yellow, and controllability and repeatability of the reaction are both high.

Description

technical field [0001] The invention relates to a catalyst and a method for modifying polymer materials, in particular to a catalyst and a method for carboxylating C6 of bacterial cellulose. Background technique [0002] Bacterial cellulose (BC) is a promising biomedical material. Usually the tough bacterial cellulose needs to be modified and then synthesized with various other substances according to the needs. But the most important point of bacterial fiber modification is to ensure that its excellent mechanical properties are not sacrificed. [0003] The biocompatibility of BC is very good, so it is a promising biomedical material. But BC is difficult to process because it contains a large amount of -OH, which can easily form hydrogen bonds and make BC entangled. In this case, BC cannot be well prepared into scaffold materials, sponge materials, etc. Moreover, -OH is relatively difficult to react, and BC cannot be further combined with other polymer materials. Theref...

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Problems solved by technology

[0008] 2. Under this system, the yield of the product is low, because the reaction is also relatively intense, resulting in excessive oxidation of part of the cellulose, which becomes a soluble substance and is removed by centrifugation;

[0009] 3. When NaClO is used as the main catalyst, the concentration is not easy to control, because NaClO is usually sold and stored in the form of a solution, which is easily affected by light and temperature.

The controllability of the response is poor, and the repeatability of the experiment is poor

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