The hydrothermal properties of unidirectional reinforcement composite laminates T700/5429 are pres鄄
ented in this paper. T700/5429 laminate are made by autoclave, the specimens were soaked at temperature of 45益
and 85益in water bath for a period of 90 days. FT-IR, moisture absorption rate, the flexural and in鄄plane compres鄄
sive strengths were measured and analyzed before and after immersed. The results showed that the new absorption
peaks of resin matrix did not appear for their FT-IR, the moisture absorption of composite belongs to diffusion behav鄄
ior and could be described by Fick爷s Law. The relations of the flexural and in鄄plane compressive strength of the com鄄
posites with immersion time is not linear, that is fractal. The fractal dimension of flexural strength is 1郾10 (45益),
1. 07(85益), and the fractal dimension of in鄄plane compressive strength is 1. 04(45益), 1. 05(85益). It is showed
that the changes of flexural and in鄄plane compressive strength of composite between immersion time have some degree
of complexity.