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(a) Yield strength and (b) strain at break for poly-L-lactic acid (PLLA) samples before and after 5 weeks of aging as a function of hydroxyapatite (nHA) content. (c) Mass loss and (d) degree of crystallinity for amorphous sample, as a function of the aging time for PLLA containing nHA at 0, 5, and 10 wt.% [42], Reproduced with permission from Delabarde C, Polym. Degrad. Stab.; published by Elsevier, 2011.
