Cellulose Nanocrystals Reinforced Hydrogels:Insights from Morphology to Dynamics
The understanding interactions between fillers and polymer matrix are a critical challenge in the refined control of nanocomposites.In this paper,the morphologies and interactions of cellulose nanocrystal/poly(acrylic acid)(CNC/PAA)nanocomposite hydrogels are investigated using a developed synthetic platform.Two sources of CNCs with different aspect ratio are applied to model the reinforcement process,and the uniaxial tensile measurements suggest that aspect ratio and nanocomposite strength enhancement is coupled,where the high aspect ratio and non-permanent interaction of the CNCs dominate the energy dissipation process during deformation.Dynamic mechanical analysis is performed to investigate the nature of the constrained polymer as the semicrystalline fractions and results indicate that the chain mobility in nanocomposite hydrogels is significantly reduced.Rheological analysis and TEM images show that both stepwise dissociation and polymer chain rearrangement on the CNC surface reinforce the nanocomposite hydrogels mechanical strength.The increased modulus of the hydrogels is ascribed to the high concentration of the CNC and volume of the constrained polymer,where strong polymer/filler interactions lead to superior fracture toughness.This study of structure-property relationship of nanocomposites deepens the understanding of particles reinforcement mechanism and provides valuable knowledge for designing of high performance nanocomposite hydrogels.
Jun Yang
Beijing Key Laboratory of Lignocellulosic Chemistry,Beijing Forestry University,Beijing,100083,China
国际会议
第五届制浆造纸新技术国际研讨会(ISETPP)暨第三届国际造纸与环境学术大会(IPEC)
广州
英文
1-4
2016-11-07（万方平台首次上网日期，不代表论文的发表时间）