Simultaneous the thermodynamics favorable compatibility and morphology to achieve excellent comprehensive mechanics in PLA/OBC blend
Simultaneous the thermodynamics favorable compatibility and morphology to achieve excellent comprehensive mechanics in PLA/OBC blend
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同时具有良好的热力学相容性和形态，在 PLA/OBC 共混物中实现优异的综合力学性能
DOI：
10.1016/j.polymer.2014.10.004
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发表时间：
2014-11
期刊：
影响因子：
4.6
通讯作者：
Qiang Fu
中科院分区：
文献类型：
--
作者：
Meng Wu;Zhiqiang Wu;Ke Wang;Qin Zhang;Qiang Fu
为了通过使用弹性体组分增韧热塑性塑料，通常需要相对高含量的弹性体相以引发脆韧转变。然而，在掺入大量弹性体物质后，可能出现强度和刚度显著降低的明显缺点。我们目前工作的主要思路是在具有少量弹性体相的增韧热塑性体系中实现良好的韧性-强度平衡，即，共混物的聚（乳酸）（PLA）/烯烃嵌段共聚物（OBC）90/10 w/w。当PLA/OBC 90/10共混物既具有良好的热力学相容性又具有稳定的形态结构时，其冲击韧性是纯PLA的25倍，而拉伸强度保持在纯PLA的87%左右。通过加入EMA-GMA作为相容剂，实现了PLA与OBC的界面相容。另一方面，在90 °C下的静态退火过程导致更热稳定的形态，其特征在于高结晶度、大尺寸的非晶相液滴和增厚的界面层。我们的研究为多组分共混物的性能优化提供了新的见解，除了实现热力学上有利的相容性外，从动力学主导的形态向热力学稳定形态的转变也起着至关重要的作用。
For the toughening of thermoplastics by using elastomeric components, the relatively high contents of elastomeric phase are commonly demanded to trigger the brittle-to-ductile transition. However, an obvious drawback of remarkably decreased strength and rigidity may arise after incorporation of large amount of elastomeric species. The main thinking in our present work is to achieve a good toughness-strength balance in an elastomer-toughened thermoplastic system with less amount of elastomeric phase, i.e., the blend of poly(lactic acid) (PLA)/olefin block copolymer (OBC) 90/10 w/w. When both of the thermodynamics favorable compatibility and the thermodynamically stable morphology were realized, the impact toughness of PLA/OBC 90/10 blend was 25 multiples for that of pure PLA, while the tensile strength could preserve as a level of 87% (based on the value of pure PLA). The interfacial compatibilization between PLA and OBC achieved through adding EMA-GMA as a compatibilizer. On the other hand, a quiescent annealing process at 90 °C resulted in a more thermodynamically stable morphology, which was characterized as high crystallinity, large size of elastomer-phase droplet, and thickening interfacial layer. Our study offers new insight into the optimization of properties of multicomponent blend that except for realizing the thermodynamics favorable compatibility, the transition from kinetics-dominated morphology to thermodynamically stable one also plays a crucial role.
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DOI：
10.1002/(sici)1439-2054(20000301)276:1
发表时间：
2000-03
影响因子：
3.9
作者：
E. Meyer;H. Braun
通讯作者：
E. Meyer;H. Braun
影响因子：
5.5
作者：
J. Reignier;B. Favis
通讯作者：
J. Reignier;B. Favis
中间相分离对烯烃嵌段共聚物结晶行为的影响
影响因子：
5.5
作者：
Jin, Jing;Du, Jiang;Han, Charles C.
通讯作者：
Han, Charles C.
DOI：
10.1016/b978-0-12-803581-8.11555-3
发表时间：
2020
期刊：
Encyclopedia of Renewable and Sustainable Materials
影响因子：
--
作者：
M. H. Othman
通讯作者：
M. H. Othman
影响因子：
9.5
作者：
Ojijo, Vincent;Ray, Suprakas Sinha;Sadiku, Rotimi
通讯作者：
Sadiku, Rotimi