We synthesized 3–16 armed methyl-β-cyclodextrin-poly(l-lactide) (MCD-PLLA) polymers, and then blended them with PLLA. The addition of MCD-PLLA with 9 or 12 arms to PLLA dramatically increased the elongation at break (E) and toughness (U_T) of PLLA with little affecting its T_g and tensile strength. The highest E and U_T were obtained to be 127% and 6.85 GJ/m³, respectively, for PLLA blends containing these MCD-PLLAs. It was confirmed that the MCD-PLLA served as a nucleation agent for PLLA, inducing PLLA chains to form smaller and more uniform-sized crystallites compared with pure PLLA. The homogeneous fragmentation of these small and uniform-sized crystallites during tensile deformation consequently resulted in such a remarkable increase in E and U_T. In contrast, the addition of MCD-PLLAs with more than 12 arms to PLLA decreased its E and U_T mainly due to preferential crystallization by themselves.

中文翻译：

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多臂甲基-β-环糊精-聚（l-丙交酯）制备高伸长率高韧性聚（l-丙交酯）

我们合成了3–16个武装的甲基-β-环糊精-聚（l-丙交酯）（MCD-PLLA）聚合物，然后将它们与PLLA混合。MCD-PLLA的添加具有9个或12臂PLLA断裂（急剧增加的伸长ë）和韧性（ü _Ť PLLA的）几乎没有影响其Ť_克和拉伸强度。获得的最高E和U _T为127％和6.85 GJ / m ³分别用于包含这些MCD-PLLA的PLLA混合物。证实了MCD-PLLA用作PLLA的成核剂，与纯PLLA相比，诱导PLLA链形成更小，更均匀尺寸的微晶。这些小的且均一尺寸的微晶在拉伸变形过程中均匀破碎，从而导致E和U _T显着增加。相反，向PLLA添加具有12个以上臂的MCD-PLLA会降低其E和U _T，这主要是由于它们自身的优先结晶。