碳纤维增强明胶(C/Gel)生物复合材料的溶胀动力学研究

分别采用溶液交联和蒸汽交联法制备了C_L/Gel复合材料,溶液交联C_L/Gel复合材料的溶胀行为可用二次速率方程描述,但不满足Fick定律;蒸汽交联C_L/Gel复合材料的溶胀既不能用二次速率方程表达,也不满足Fick定律,其溶胀度低于前者。虽然溶液交联C_S/Gel复合材料的溶胀与溶液交联C_L/Gel复合材料遵循同样的规律,但C_S/Gel复合材料的平衡溶胀度W_∞和溶胀速率K_∞均小于相应的C_L/Gel复合材料。结果表明,纤维形式和含量对C/Gel生物复合材料的溶胀性能有较大的影响,笔者对其影响机制进行了初步探讨。

SWELLING KINETICS OF CARBON FIBER- REINFORCED GELATIN (C/GEL) BIOCOMPOSITES

Carbon fiber reinforced gelatin (C/Gel) biocomposites were prepared by solution and vapor cross-linked modes, respectively. The swelling behavior of the solution cross-linked CL/Gel and CS/Gel composites did not follow the Fick's law; instead, it could be described by a second-order rate equation. Neither the Fick's law nor the second-order rate equation could be used to describe the swelling kinetics of the vapor cross-linked CL/Gel composite that exhibited a lower swelling ratio in comparison to the solution cross-linked counterpart. The maximum swelling ratio (W∞) and swelling rate (K∞) for the solution cross-linked CL/Gel and CS/Gel composites were improved with the increase of fiber volume fraction, the latter showing lower W∞ and K∞ values at an identical fiber level. It is concluded that the fiber architecture and fiber content had an obvious effect on the swelling behavior of the C/Gel composites. The mechanisms governing the phenomena have been discussed in the present paper.