...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Frontiers of chemical science and engine >Preparation and characteristics of TEMPO-oxidized cellulose nanofibrils from bamboo pulp and their oxygen-barrier application in PLA films
【24h】

Preparation and characteristics of TEMPO-oxidized cellulose nanofibrils from bamboo pulp and their oxygen-barrier application in PLA films

机译：竹浆中TEMPO氧化纤维素纳米原纤维的制备，表征及其在PLA膜中的阻氧应用

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Bleached bamboo kraft pulp was pretreated by 2,2,6,6-tetramethylpiperidine-1-oxy radical (TEMPO)mediated oxidation using a TEMPO/NaBr/NaClO system at pH = 10 in water to facilitate mechanical disintegration into TEMPO-oxidized cellulose nanofibrils (TO-CNs). A series of TO-CNs with different carboxylate contents were obtained by varying amounts of added NaClO. An increase in carboxylate contents results in aqueous TO-CN dispersions with higher yield, zeta potential values, and optical transparency. When carboxylate groups are introduced, the DPv value of the TO-CNs remarkably decreases and then levels off. And the presence of hemicellulose in the pulp is favorable to TEMPO oxidization. After the oxidization, the native cellulose I crystalline structure and crystal size of bamboo pulp are almost maintained. TEM micrographs revealed that the degree of nanofibrillation is directly proportional to the carboxylate contents. With increasing carboxylate contents, the free-standing TO-CN films becomes more transparent and mechanically stronger. The oxygen permeability of PLA films drastically decreases from 355 for neat PLA to 8.4 mL.m(-2).d-(1) after coating a thin layer of TO-CN with a carboxylate content of 1.8 mmol.g(-1). Therefore, inexpensive and abundant bamboo pulp would be a promising starting material to isolate cellulose nanfibrils for oxygen-barrier applications.
机译：使用TEMPO / NaBr / NaClO系统在pH = 10的水中通过2,2,6,6-四甲基哌啶-1-氧基（TEMPO）介导的氧化对漂白的竹牛皮纸浆进行预处理，以促进机械分解为TEMPO氧化的纤维素纳米纤维（TO-CN）。通过改变NaClO的添加量获得了一系列具有不同羧酸盐含量的TO-CN。羧酸盐含量的增加导致TO-CN水性分散液具有更高的收率，ζ电势值和光学透明性。当引入羧酸酯基团时，TO-CN的DPv值显着降低然后稳定。纸浆中半纤维素的存在有利于TEMPO氧化。氧化后，竹浆的天然纤维素I晶体结构和晶体尺寸几乎保持不变。 TEM显微照片显示，纳米原纤化程度与羧酸盐含量成正比。随着羧酸盐含量的增加，独立的TO-CN薄膜变得更加透明并且机械强度更高。涂上一层羧酸盐含量为1.8 mmol.g（-1）的TO-CN薄层后，PLA膜的透氧性从纯PLA的355急剧降低至8.4 mL.m（-2）.d-（1） 。因此，廉价而丰富的竹浆将成为有希望的起始材料，以分离用于氧气阻隔应用的纤维素纳米纤维。

著录项

  • 来源
    《Frontiers of chemical science and engine》 |2017年第4期|554-563|共10页
  • 作者

    Wu Bozhen; Geng Biyao; Chen Yufei; Liu Hongzhi; Li Guangyao; Wu Qiang;

  • 作者单位

    Zhejiang Univ Technol, Coll Mat Sci & Engn, Hangzhou 310014, Zhejiang, Peoples R China;

    Zhejiang Prov Collaborat Innovat Ctr Bamboo Resou, Hangzhou 311300, Zhejiang, Peoples R China|Zhejiang Agr & Forestry Univ, Sch Engn, Hangzhou 311300, Zhejiang, Peoples R China;

    Zhejiang Prov Collaborat Innovat Ctr Bamboo Resou, Hangzhou 311300, Zhejiang, Peoples R China|Zhejiang Agr & Forestry Univ, Sch Engn, Hangzhou 311300, Zhejiang, Peoples R China;

    Zhejiang Prov Collaborat Innovat Ctr Bamboo Resou, Hangzhou 311300, Zhejiang, Peoples R China|Zhejiang Agr & Forestry Univ, Sch Engn, Hangzhou 311300, Zhejiang, Peoples R China;

    Zhejiang Agr & Forestry Univ, Sch Engn, Hangzhou 311300, Zhejiang, Peoples R China;

    Zhejiang Prov Collaborat Innovat Ctr Bamboo Resou, Hangzhou 311300, Zhejiang, Peoples R China|Zhejiang Agr & Forestry Univ, Sch Engn, Hangzhou 311300, Zhejiang, Peoples R China;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    bamboo; TEMPO; cellulose nanofibrils; oxygen barrier;

    机译：竹;TEMPO;纤维素纳米纤维;阻氧;

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号