全文下载： 
202303009.pdf
文章编号： 1672-6987（2023）03-0070-08； DOI： 10.16351/j.1672-6987.2023.03.009
胡洁1， 侯晓宇1， 岳成宇1， 张倩倩2， 陈晓燕2， 段咏欣1*， 张建明1（1.青岛科技大学 橡塑材料与工程教育部重点实验室,山东 青岛 266042；2. 双星集团有限责任公司，山东 青岛 266400）
摘要： 为了降低纤维素纳米晶（CNCs）的极性，提高其与非极性聚合物的相容性，改善其在聚合物基体中的分散性，以油酸(OA)作为改性剂对硫酸酸解纤维素纳米晶(CNC-S)进行表面疏水改性，并经冷冻-干燥处理得到疏水且疏松的纤维素纳米晶粉末(CNC-OA)。对CNC-S和CNC-OA的化学结构、形态和热稳定性的详细表征表明： CNC-S具有典型的纤维素Ⅰ 晶型，而CNC-OA具有纤维素 Ⅰ 晶型和 Ⅱ 晶型共存的晶体结构，且CNC-OA具有更高的耐热性和良好的疏水性(接触角1387°)。分别以CNC-S和CNC-OA粉末部分替代裂解炭黑(CBp)补强天然橡胶(NR)。通过对NR/CBp，NR/CBp/CNC-S和NR/CBp/CNC-OA复合材料的结构及性能对比表明：两种CNCs的加入均有助于改善CBp在NR中的分散；由于CNC-S与NR相容性差，在NR中难分散且对NR硫化有明显的抑制作用，NR/CBp/CNC-S拉伸强度和储能模量较NR/CBp更低；相反，CNC-OA与NR界面相容性良好，在NR中分散均匀且对NR硫化的抑制作用甚微，NR/CBp/CNC-OA具有较NR/CBp更优异的物理机械性能。
关键词： 疏水改性； 油酸； 纤维素纳米晶； 裂解炭黑； 天然橡胶； 复合材料
中图分类号： O 636.1+1文献标志码： A
引用格式： 胡洁，侯晓宇，岳成宇，等.疏水性纤维素纳米晶粉末的制备及其与裂解炭黑并用补强天然橡胶［J］. 青岛科技大学学报(自然科学版), 2023, 44(3): 70-77.
HU Jie, HOU Xiaoyu, YUE Chengyu，et al.Preparation of hydrophobic cellulose nanocrystals powder and its combination application with pyrolysis carbon black in reinforcing natural rubber［J］. Journal of Qingdao University of Science and Technology（Natural Science Edition), 2023， 44（3）： 70-77.
Preparation of Hydrophobic Cellulose Nanocrystals Powder
and Its Combination Application with Pyrolysis Carbon Black
in Reinforcing Natural Rubber
HU Jie1, HOU Xiaoyu1, YUE Chengyu1， ZHANG Qianqian1, CHEN Xiaoyan2,
DUAN Yongxin1, ZHANG Jianming1
(1.Key Laboratory of Rubber-Plastics, Ministry of Education, Qingdao University of Science and Technology,
Qingdao 266042, China; 2.Shuangxing Group Co., Ltd., Qingdao 266400, China)
Abstract: In order to reduce the polarity of cellulose nanocrystals (CNCs), improve their compatibility with non-polar polymers and dispersion in polymer matrix,oleic acid (OA) was used as modifier to hydrophobically modify the surface of sulfated CNCs (CNC-S), and the hydrophobic and loose CNCs powder (CNC-OA) was obtained by freeze-drying. The characterizations of the chemical structure, morphology and thermal stability of CNC-S and CNC-OA show that CNC-S has a typical cellulose Ⅰ form, while CNC-OA has the crystal structure of coexistence of cellulose Ⅰ and Ⅱ crystal forms. CNC-OA shows the improved heat resistance and good hydrophobicity (contact angle 1387°). Pyrolysis carbon black (CBp) was partly replaced by CNC-S or CNC-OA powders and used to reinforce natural rubber (NR). The characterization and performance comparison of NR/CBp, NR/CBp /CNC-S and NR/CBp/CNC-OA composites show that the addition of the two kinds of CNCs is helpful to dispersion improvement of CBp in NR. Due to the poor compatibility between CNC-S and NR, the easy aggregation of CNC-S in NR and the inhibition of CNC-S on the vulcanization of NR, the tensile strength and storage modulus of NR/CBp/CNC-S are lower than that of NR/CBp.
Key words: hydrophobic modification; oleic acid; cellulose nanocrystals; pyrolysis carbon black; natural rubber; compounds
收稿日期： 2022-03-18
基金项目： 国家重点研发计划“固废资源化”重点专项课题项目(2018YFC1902604).
作者简介： 胡洁（1987—），女，博士研究生.*通信联系人.
