Design of electrical conductive poly(lactic acid)/carbon black composites by induced particle aggregation,Journal of Applied Polymer Science

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Design of electrical conductive poly(lactic acid)/carbon black composites by induced particle aggregation
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-04-04 , DOI: 10.1002/app.49295
Ji Hwan Kim ₁ , Joung Sook Hong ₁ , Kyung Hyun Ahn ₁

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The electrical conductivity of ternary composites composed of a biopolymer blend with conductive particles (carbon black [CB]) is induced by the control of particle dispersion in the dispersed phase. If the CB particles have higher chemical affinity for the secondary phase (poly(caprolactone) [PCL]]) than the matrix (poly(lactic acid) [PLA]), especially as the concentration of the PCL phase decreases significantly to 4 wt%, the PCL phase induces the aggregation of CB particles beyond the selective localization, resulting in a shift of the particle percolation threshold to a lower concentration of particles (2.44 wt% CB). Moreover, the mixing ratio between the CB and the PCL phase significantly affects the formation of percolation of particles. When the mixing ratio of CB to PCL is equivalent (1:1), the ternary composite shows high electrical DC conductivity above 1 S/m with 10 wt% CB. The addition of a small amount of PCL induces the formation of particle aggregates with a high aspect ratio, providing more electron transfer pathways due to the multiple points of contact between the particle aggregates (power law scaling exponent of the composites ~2.14). Meanwhile, a binary composite (PLA/CB) never reaches high electrical conductivity of 1 S/m and even requires a greater concentration of CB (13 wt% CB for 10⁻³ S/m) to accomplish electron transfer because of the small aspect ratio of randomly dispersed particle aggregates (power law scaling exponent ~3.20).

中文翻译：

诱导粒子聚集法设计导电聚乳酸/炭黑复合材料

通过控制分散相中的颗粒分散度，可以诱导由生物聚合物与导电颗粒（炭黑[CB]）共混物组成的三元复合材料的电导率。如果CB颗粒对第二相（聚（己内酯）[PCL]]的化学亲和性高于基质（聚（乳酸）[PLA]），特别是当PCL相的浓度显着降低至4 wt％，PCL相导致CB颗粒的聚集超出了选择性定位，导致颗粒渗滤阈值向较低浓度的颗粒（2.44 wt％CB）转移。而且，CB和PCL相之间的混合比例显着影响颗粒渗滤的形成。当CB与PCL的混合比等于（1：1）时，三元复合材料显示出高于1 S / m的高直流电导率，含10 wt％的CB。少量PCL的添加会导致高纵横比的颗粒聚集体形成，由于颗粒聚集体之间存在多个接触点，从而提供了更多的电子传输途径（复合材料的幂律定标指数为〜2.14）。同时，二元复合材料（PLA / CB）永远不会达到1 S / m的高电导率，甚至需要更高浓度的CB（10％的CB为13 wt％^-3 S / m）来完成电子转移，这是因为随机分散的粒子聚集体的纵横比较小（幂律定标指数〜3.20）。

更新日期：2020-04-04

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