Formation of a Segregated Electrically Conductive Network Structure in a Low-Melt-Viscosity Polymer for Highly Efficient Electromagnetic Interference Shielding
Formation of a Segregated Electrically Conductive Network Structure in a Low-Melt-Viscosity Polymer for Highly Efficient Electromagnetic Interference Shielding
复制标题
在低熔体粘度聚合物中形成隔离导电网络结构以实现高效电磁干扰屏蔽
DOI：
10.1021/acssuschemeng.6b00526
复制
发表时间：
2016-08-01
影响因子：
8.4
通讯作者：
Li, Zhong-Ming
中科院分区：
文献类型：
--
作者：
Cui, Cheng-Hua;Yan, Ding-Xiang;Li, Zhong-Ming
由于导电添加剂在聚合物基质中的可控组装，隔离的导电网络结构已经被很好地证明有效地改善电和电磁干扰（EMI）屏蔽性能;然而，到目前为止，聚合物基质主要限于高熔体粘度聚合物（例如，分子量或交联聚合物）。在目前的工作中，我们提出了一种在低熔体粘度聚合物中形成典型的分离结构的策略，即，聚乳酸（PLA），利用微晶的熔融温度差。将聚L-丙交酯（PLLA）和聚D-丙交酯（PDLA）进行熔融共混，然后结晶，所得共混物由均聚物（hc）和立构复合物（sc）组成，有趣的是，在熔融共混和结晶过程中自发地造粒成100 μm的颗粒。将聚乳酸微晶颗粒与碳纳米管（CNTs）的混合物在室温下进行模压成型，得到了聚乳酸微晶颗粒与CNTs的共混物。
A segregated electrically conductive network structure has been well demonstrated to efficiently improve electrical and electromagnetic interference (EMI) shielding performance owing to the controllable assembling of conductive additives in polymer matrices; however, up to now, the polymer matrices are mainly limited to high-melt-viscosity polymers (e.g., ultrahigh molecular weight or cross-linked polymers). In the current work, we proposed a strategy to form a typical segregated structure in a low-melt-viscosity polymer, i.e., poly(lactic acid) (PLA), making use of the melting temperature difference of crystallites. Poly(l-lactide) (PLLA) and poly(d-lactide) (PDLA) were first melt mixed, then crystallized, herein the resultant blend consisted of homocrystallites (hc) and stereocomplex crystallites (sc), and, interestingly, spontaneously granulated into 100 μm particles during melt mixing and crystallizing. The mixture of PLA crystallite granules and carbon nanotubes (CNTs) was compression molded at a tem...