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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and characterization of linear and star-shaped poly L-lactide blends
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Preparation and characterization of linear and star-shaped poly L-lactide blends

机译：线性和星形聚L-丙交酯混合物的制备和表征

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摘要

A series of star-shaped poly(L-lactide) (sPLLA) with different branch length was synthesized by ring-opening polymerization of L-lactide using pentaerythritol as initiator and stannous-octoate as catalyst. The structures and properties of the sPLLAs were characterized by H-1-NMR, rheology, differential scanning calorimetry, and size-exclusion chromatography. The star-shaped polymers were blended with a linear PLLA resin (3051D; NatureWorks) and studied for their melt flow and thermal properties. Blends containing 10 wt % of sPLLA displayed equivalent zero shear viscosities to PLLA 3051D, however displaying stronger shear thinning and increased melt elasticity. The blends exhibited also similar thermal and crystallization properties as the PLLA 3051D. A higher ratio of low molecular weight sPLLA (30 wt %; Mw(total): 2500 and 15,000 g mol(-1)) lowered the zero viscosity and increased shear thinning of PLLA 3051D. Crystallization of PLLA 3051D appears to increase at 30 wt % blends with the higher molecular weight sPLLA, while the star-shaped structure acts as a nucleating agent. (C) 2015 Wiley Periodicals, Inc.
机译：以季戊四醇为引发剂，辛酸亚锡为催化剂，通过L-丙交酯的开环聚合反应，合成了一系列支链长度不同的星形聚L-丙交酯。 sPLLA的结构和性质通过H-1-NMR，流变学，差示扫描量热法和尺寸排阻色谱法进行了表征。将星形聚合物与线性PLLA树脂（3051D; NatureWorks）共混，并研究其熔体流动性和热性能。包含10 wt％sPLLA的共混物显示出与PLLA 3051D等效的零剪切粘度，但是显示出更强的剪切稀化和增加的熔体弹性。该共混物还显示出与PLLA 3051D类似的热和结晶性能。低分子量sPLLA的比例较高（30 wt％; Mw（总计）：2500和15,000 g mol（-1））降低了PLLA 3051D的零粘度并增加了剪切稀化。与较高分子量的sPLLA混合30 wt％时，PLLA 3051D的结晶似乎增加，而星形结构充当成核剂。 （C）2015年Wiley Periodicals，Inc.

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