国产日产欧美精品-亚洲国产综合久久精品-色综合色国产热无码一-亚洲欧美日本国产,免费观看一区二区三区_在线观看片A免费不卡观看_亚洲а∨天堂久久精品_99久无码中文字幕一本久道

產(chǎn)品展廳收藏該商鋪

您好 登錄 注冊

當前位置:
美國布魯克海文儀器公司>技術(shù)文章>Highly Thermal-stable and Functional Cellulose Nanocrystals and Nanofibrils Produced Using Fully Rec

技術(shù)文章

Highly Thermal-stable and Functional Cellulose Nanocrystals and Nanofibrils Produced Using Fully Rec

閱讀:825          發(fā)布時間:2016-7-20

作者 Liheng Chen,   Junyong ZHU,   Carlos Baez,   Peter Kitin and   Thomas J Elder  

 

 

摘要:Here we report the production of highly thermal stable and functional cellulose nanocrystals (CNC) and nanofibrils (CNF) by hydrolysis using concentrated organic acids. Due to their low water solubility, these solid organic acids can be easily recovered after hydrolysis reactions through crystallization at a lower or ambient temperature. When dicarboxylic acids were used, the resultant CNC surface contained carboxylic acid groups which facilitate functionalization and dispersion in aqueous processing. Carboxylic acid group content was 0.1 – 0.4 mmol/g for CNC produced from a bleached eucalyptus kraft pulp (BEP) using oxalic acid at concentrations of 50 – 70 wt%. Onset thermal degradation temperature for the CNC was increased to 322°C from 274°C for the feed BEP fibers, compared with 218°C for CNC produced from the same feed fibers using conventional concentrated sulfuric acid hydrolysis. The low strength (high pKa) of organic acids also resulted in CNC with longer lengths of approximay 275 – 380 nm and higher crystallinity than those produced using mineral acids. Fibrous cellulosic solid residue (FCSR) collected from acid hydrolysis was an excellent feedstock for producing CNF through subsequent mechanical fibrillation with low energy input. The ability to recover the organic acids using a conventional and commercially proven crystallization method makes these organic acids uniquely suited for sustainable and green production of cellulose nanomaterials. The resultant CNC and CNF with high thermal stability and large aspect ratio are excellent for bio-composite applications.

 

收藏該商鋪

登錄 后再收藏

提示

您的留言已提交成功!我們將在第一時間回復(fù)您~

對比框

產(chǎn)品對比 產(chǎn)品對比 聯(lián)系電話 二維碼 意見反饋 在線交流

掃一掃訪問手機商鋪
010-62081908
在線留言
西宁市| 新兴县| 永修县| 宜春市| 罗城| 湄潭县| 麟游县| 兴安盟| 万荣县| 耒阳市| 本溪市| 衡阳县| 罗甸县| 和龙市| 霍林郭勒市| 齐齐哈尔市| 黔江区| 高淳县| 韶山市| 婺源县| 岳池县| 旬邑县| 宜宾县| 无棣县| 仪征市| 万源市| 丹凤县| 大庆市| 石河子市| 平昌县| 吴忠市| 巨野县| 屏山县| 河北省| 叙永县| 高雄县| 安新县| 阿鲁科尔沁旗| 乐昌市| 瓮安县| 德保县|