Abstract
PLA and PGLA, as biodegradable polymers, are widely used in the biomedical field, such as in surgical sutures, drug delivery devices, and tissue engineering research and so on. However, the lack of hydrophilic groups on their surfaces limit their application. For improving hydrophilicity of PGA and PGLA fibers, and preserving fiber mechanical property at the same time, PLA and PGLA fibers were modified by potassium dichromate solution for different processing time for optimizing modification parameter. Breaking strength and water contact angle were tested to observe the change of properties, differential scanning calorimeter (DSC) and fourier transform infrared spectrometry (FTIR) were used to analyse the change of molecular structure and functional groups. Experimental results showed that 6min was the most suitable time for improving hydrophilicity of PLA and PGLA fibers and preserve fiber mechanical property.
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