《Table 1 Mechanical properties of pure PLLA and PLLA/BMCD blended polymer materials》

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《Toughening of Poly (L-lactide) with Branched Multiblock Poly (ε-caprolactone)/poly (D-lactide) Copolymers》

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Pure PLLA materials are brittle and exhibit limited extendibility.BM CDblended PLLAhave substantially improved mechanical properties.The stress-strain curves of pure PLLA and the blends w ere presented in Fig.4 and the mechanical properties of the materials w ere summarized in Table 1.From Fig.4，the elongation at break of the PLLA/BM CD blends increased as the BM CD contents increased，w hile the strength decreased.From Table 1，the elongation at break of the blend w as 9.60%w hen 3%（mass fraction）BM CD w as added，w hich w as slightly higher than the pure PLLA（3.93%）.The elongation at break of the blend with 5%（mass fraction）of BM CD reached 50.97%and the tensile strength kept at a relatively high value of 50.50 M Pa.Further increase in the contents of BM CD to 7%，10%and 20%（mass fraction）enhanced elongation at break to 104.55%，200.62%and282.56%，respectively.The tensile strengths and Young&apos；s modulus of PLLA/BM CD blends decreased as the BM CD contents increased.The degree of the reduction w ere great.The dramatic reductions implied w eak interaction betw een PLLA and BM CD.For BM CD-20%，the tensile strength at break w as higher than the tensile strength at yield point，w hich probably ow ed to the formation of the stereocomplex in the blend.As the ratio of enantiomer increased，new hydrogen bonds w ere formed during the stretching，leading to a higher breaking strength at the post-yield region.