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Title: Enhancing thermal conductivity and toughness of cellulose nanofibril/boron nitride nanosheet composites

Journal Article · · Carbohydrate Polymers
 [1];  [2];  [2]; ORCiD logo [3];  [4];  [5];  [6];  [6];  [2]
  1. Guangxi Univ., Nanning (China); Beijing Forestry Univ. (China)
  2. Guangxi Univ., Nanning (China)
  3. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Joint Institute for Biological Sciences (JIBS)
  4. Beijing Forestry Univ. (China)
  5. China Univ. of Mining and Technology, Xuzhou, Jiangsu (China)
  6. Univ. of Science and Technology of China, Tianjin (China)

Generally, the thermal conductivity (TC) of composite based on cellulose nanofibrils (CNF) is improved by adding thermal conductive filler, which inevitably leads to the loss of its mechanical properties. Here, in this work, it is the first to simultaneously improve the toughness and TC of CNF/boron nitride nanosheets (BNNS) composite from the perspective of thermal conductive filler addition and CNF crystal change. The hydrophilic-modified BNNSs were successfully prepared by xylose-assisted ball-milling prior to adding into CNF. Compared with that of CNF film (1.34 W/(m·K)), the in-plane TC of CNF/BNNS composite (12.68 W/(m·K)) increased significantly by 846 % with loading 30 % BNNS. Afterwards, both toughness (8.0 MJ·m-3, increased ~250 %) and TC (14.7 W/(m·K), increased ~16 %) of CNF/BNNS composite were further enhanced significantly by mercerization with 12.5 % NaOH solution. The simultaneously improvement of toughness and TC is unprecedented in related studies, which contributes to the effective preparation of thermal management materials.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Guangxi University; National Key Research and Development Program of China; Natural Science Foundation of Guangxi Province; USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1892395
Journal Information:
Carbohydrate Polymers, Journal Name: Carbohydrate Polymers Vol. 296; ISSN 0144-8617
Publisher:
Applied Science DirectCopyright Statement
Country of Publication:
United States
Language:
English

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