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首页> 外文期刊>Journal of Polymers and the Environment >Compatibilization of PLA/PEBA Blends via Reactive Extrusion: A Comparison of Different Coupling Agents
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Compatibilization of PLA/PEBA Blends via Reactive Extrusion: A Comparison of Different Coupling Agents

机译：通过反应挤出对PLA / PEBA共混物的相容性：不同偶联剂的比较

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Poly(lactic acid) (PLA)/poly(ether-b-amide) (PEBA) blends were prepared by melt extrusion using a co-rotating twin-screw extruder. PEBA elastomer, with content varying between 0-24 wt%, was used to toughen PLA. PLA/PEBA blends are found to be immiscible on all the composition range studied. Rigidity and strength of PLA/PEBA blends are strongly decreased by the incorporation of PEBA. The fragile-ductile transition was observed in the 8-12 wt% PEBA range. A variety of reactive coupling agents have been used in low (2 wt%) and high proportions (4-12 wt%) to compatibilize PLA/PEBA blends. Their efficiency was evaluated by comparing their thermal, mechanical and morphological properties. Poly(ethylene-co-methyl acrylate-co-glycidyl methacrylate) (PEAGM), poly(maleic anhydride-alt-1-octadecene) (PMAOD), 1,1'-carbonyl biscaprolactam (CBC) and 4,4-methylene diphenyl diisocyanate (MDI) were incorporated during melting process. Compatibilized PLA/PEBA blends were also compared with PLA/PEBA blends with various amounts (0-8 wt%) of polyethylene glycol (PEG). In the blends, PEG acted exclusively as a plasticizer in the PLA rigid phase; it drastically increased fluidity, ductility and impact strength. PMAOD and PEAGM bridged the two immiscible polymers at the interface. When used in small amounts, PMAOD and PEAGM reactive copolymers compatibilized, to some extent, PLA/PEBA blends as testified by a moderate increase in the impact strength (similar to 25 %); both reduce the tensile strength and the Young's modulus. CBC also had a moderate compatibilizing effect and provided an antiplasticizing-like effect by acting essentially on the PLA rigid phase. An excellent toughening effect was achieved with the use of MDI without penalizing Young's modulus, tensile strength or elongation at break. The strength needed to break the notched Izod and the Garner impact was about 7 and 63 times higher than the corresponding blend without MDI, respectively. The super toughening effect was attributed to the crosslinking of the rigid segments of the soft PEBA phase, together with the various efficient coupling reactions making the optimal interfacial adhesion possible.
机译：聚乳酸（PLA）/聚醚-b-酰胺（PEBA）共混物是使用同向双螺杆挤出机通过熔融挤出制备的。含量在0-24 wt％之间变化的PEBA弹性体用于增韧PLA。发现在所有研究的组成范围内，PLA / PEBA混合物均不混溶。掺入PEBA会使PLA / PEBA共混物的刚性和强度大大降低。在8-12重量％的PEBA范围内观察到脆性-韧性转变。已经以低（2重量％）和高比例（4-12重量％）使用了多种反应性偶联剂，以使PLA / PEBA共混物相容。通过比较它们的热，机械和形态特性来评估它们的效率。聚（乙烯-丙烯酸甲酯-甲基丙烯酸缩水甘油酯）（PEAGM），聚（马来酸酐-alt-1-十八碳烯）（PMAOD），1,1'-羰基双己内酰胺（CBC）和4,4-亚甲基二苯基在熔融过程中加入了二异氰酸酯（MDI）。还将相容的PLA / PEBA共混物与具有各种量（0-8 wt％）的聚乙二醇（PEG）的PLA / PEBA共混物进行了比较。在共混物中，PEG仅在PLA刚性相中充当增塑剂。它大大增加了流动性，延展性和冲击强度。 PMAOD和PEAGM在界面处桥接了两种不混溶的聚合物。当少量使用时，PMAOD和PEAGM反应性共聚物在一定程度上使PLA / PEBA共混物相容，这表明冲击强度适度增加（约25％）。都降低了拉伸强度和杨氏模量。 CBC还具有适度的增容作用，并且通过基本上作用于PLA刚性相而提供了类似增塑的作用。使用MDI可获得出色的增韧效果，而不会损害杨氏模量，拉伸强度或断裂伸长率。打破缺口悬臂梁和加纳冲击所需的强度分别是相应的不含MDI的共混物的7倍和63倍。超级增韧效果归因于软PEBA相的刚性链段的交联，以及各种有效的偶联反应，使最佳的界面粘合成为可能。

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