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Preparation of High-Elongation and High-Toughness Poly( l -lactide) Using Multi-Arm Methyl- β -Cyclodextrin-Poly( l -lactide)
Macromolecular Research ( IF 2.8 ) Pub Date : 2019-11-22 , DOI: 10.1007/s13233-020-8041-0
Jin-Hee Hong , Seungjoo Haam , Giobin Lim , Jong-Hoon Ryu

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 (UT) of PLLA with little affecting its Tg and tensile strength. The highest E and UT 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 UT. In contrast, the addition of MCD-PLLAs with more than 12 arms to PLLA decreased its E and UT mainly due to preferential crystallization by themselves.


中文翻译:

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和拉伸强度。获得的最高EU 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EU 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EU T,这主要是由于它们自身的优先结晶。
更新日期:2019-11-22
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