Citation: Hao Zhang, Ying She, Xue Zheng, He-yu Chen, Jun-wen Pu. 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 shu

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

Hao Zhang ¹ ,
Ying She ¹ ,
Xue Zheng ¹ ,
He-yu Chen ¹ ,
Jun-wen Pu ^1,,

1.
MOE Key Laboratory of Wooden Material Science and Application, Beijing Forestry University, Beijing 100083, China

Corresponding author: Jun-wen Pu,
Received Date: 16 December 2013
Revised Date: 10 February 2014

Fund Project: This work was financially supported by the Fundamental Research Funds for the Central Universities (No. BLYJ201301) and the Forestry Industry Research Special Funds for Public Welfare Projects: Research and Demonstration of Fast-growing Wood Modification and Application (201204702-B2).

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.
- Nanocrystalline cellulose,
- Waterborne polyurethane,
- Cotton,
- Optical and mechanical properties,
- Nanocomposites
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沈阳化工大学材料科学与工程学院沈阳 110142