Optical and Mechanical Properties of Polyurethane/Surface-modified Nanocrystalline Cellulose Composites

Hao Zhang; Ying She; Xue Zheng; He-yu Chen; Jun-wen Pu

doi:10.1007/s10118-014-1526-6

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Optical and Mechanical Properties of Polyurethane/Surface-modified Nanocrystalline Cellulose Composites

PAPER | Updated：2021-06-21

- Optical and Mechanical Properties of Polyurethane/Surface-modified Nanocrystalline Cellulose Composites
- Chinese Journal of Polymer Science Vol. 32, Issue 10, Pages: 1363-1372(2014)
- Affiliations：
  
  MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China
- Author bio：
  
  **Jun-wen Pu (蒲俊文), E-mail: jwpu@bjfu.edu.cn
- Funds：
- DOI：10.1007/s10118-014-1526-6
  CLC：
- Received：16 December 2013，
  
  Revised：2014-02-07，
  
  Accepted：10 February 2014，
  
  Published：2014-10
- Accepted：
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Hao Zhang, Ying She, Xue Zheng, et al. Optical and Mechanical Properties of Polyurethane/Surface-modified Nanocrystalline Cellulose Composites[J]. Chinese Journal of Polymer Science, 2014, 32(10): 1363-1372.
DOI：

Hao Zhang, Ying She, Xue Zheng, et al. Optical and Mechanical Properties of Polyurethane/Surface-modified Nanocrystalline Cellulose Composites[J]. Chinese Journal of Polymer Science, 2014, 32(10): 1363-1372. DOI： 10.1007/s10118-014-1526-6.

摘要

Abstract

In order to improve the optical and mechanical performances of waterborne polyurethane (WPU)

nanocrystalline cellulose (NCC)/WPU composites were synthesized in this study. NCC (prepared by acid hydrolysis of cotton fiber) was modified by (3-aminopropyl)triethoxysilane (APTES) to enhance its compatibility with WPU

and the surface-modified NCC was characterized by grafting ratio

crystallinity and contact angle (CA). NCC/WPU composites were examined by scanning electron microscopy (SEM)

X-ray powder diffraction (XRD) and thermogravimetric analysis (TG). The anti-yellowing property

specular gloss

pencil hardness

and abrasion resistance of NCC/WPU composites were investigated by the methods of Chinese National Standards GB/T 23999-2009

GB/T 9754-2007

GB/T 6739-2006 and GB/T 1768-2006

respectively. The results showed that the grafting ratio of NCC modified by 6% APTES was 36.01% and the crystallinity of modified NCC was decreased with the enhancement of APTES. CA of the modified NCC was decreased by 28.8% and the nanoparticles were homogeneously dispersed in the WPU matrix. The XRD patterns of the NCC/WPU composites were relatively steady

while the thermal stability of the composites was enhanced by 6.7% with 1.0 wt% modified NCC. Modified NCC affected the specular gloss of NCC/WPU composites more obviously than the anti-yellowing property. The pencil hardness of NCC/WPU composites was increased from 2H to 4H by addition of NCC and the abrasion resistance of the composites was enhanced significantly. In general

NCC/WPU composites showed significant improvements in the optical and mechanical performances.

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