In both solution-and melt-crystallization of blends of poly(L-2-hydroxy-3-methylbutanoic acid) [P(L-2H3MB)] and poly(D-2-hydroxy-3-methylbutanoic acid) [P(D-2H3MB)],solely stereocomplex (SC) crystallites were formed without formation of homo-crystallites, excluding the melt-crystallization at crystallization temperature (T-c) = 100 degrees C, wherein both SC and homo-crystallization took place. In solution-crystallization of neat P(L-2H3MB) and P(D-2H3MB), the same type of homo-crystallites as reported earlier were formed. In melt-crystallization of the neat P(L-2H3MB) and P(D-2H3MB), for the T-c range of 0-150 degrees C, a new type of homo-crystallites having WAXD profiles similar to the alpha- or delta-form homo-crystallites of neat PLLA and PDLA were formed. The melting temperature (T-m)values of SC crystallites in the blend (189-193 degrees C) were slightly higher than those of homo-crystallites in the neat P(L-2H3MB) and P(D-2H3MB) (163-178 degrees C). The radial growth rate of spherulites (G) and the spherulitic number per unit area of SC crystallites in the blend were respectively much lower and higher than those of homo-crystallites in the neat P(L-2H3MB) and P(D-2H3MB). Despite not so high T-m and lower G of SC crystallites in the blend compared with those of homo-crystallites in the neat P(L-2H3MB) and P(D-2H3MB), the critical Tc of the blend above which the induction period for spherulite growth (t(i)) becomes positive was higher by 30 degrees C than those of the neat polymers. These results indicate that in the blend samples, the large side chains of P(L-2H3MB) and P(D-2H3MB) lowered the G of SC spherulites but facilitated the nucleation process, compared with those of the spheruites of homo-crystallites in the neat polymers. (C) 2015 Elsevier Ltd. All rights reserved.