biomaterial

Poly (lactic acid) (PLA) shows a promising prospect for medical fields. In bone hard-tissue application, glass fibers are adopted to improve the mechanical properties of PLA. Figure 2a and 2b show SEM photographs of two types of PLA/glass fiber composites. Figure 2 : SEM photograph of two types of PLA/glass fiber composites i) Point out the function of interface. [1 mark] ii) Which composite in Figure 2 shows better interface between PLA and glass fibers? [1 mark] iii) Suggest two methods to improve the interaction between PLA and glass fibers. [4 marks] iv) Discuss and sketch one interfacial bonding mechanism between matrix and reinforcement. [4 marks]