Anchored metallocene linear low‐density polyethene cellulose nanocrystal composites,Polymer International

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Anchored metallocene linear low‐density polyethene cellulose nanocrystal composites
Polymer International ( IF 2.9 ) Pub Date : 2020-10-19 , DOI: 10.1002/pi.6146
Keith D Hendren ₁ , Sarita A Hough ₂ , Kenneth Knott ₂ , Wei Lu ₃ , Paul A Deck ₂ , E Johan Foster _{1,

4}

Affiliation

Cellulose nanocrystals (CNCs) were functionalized with different loadings of metallocene catalyst and subjected to in situ polymerization with ethene and 1‐hexene to yield linear low‐density polyethene (LLDPE) polymer matrix composites (PMCs). CNC content was determined with thermogravimetric analysis, confirming that the PMCs varied in their CNC loadings from 3.6 to 11.4 wt%. Differential scanning calorimetric, gel permeation chromatographic and NMR spectroscopic analyses revealed that the LLDPE (matrix) components of these PMCs shared similar physical properties. Dynamic mechanical analysis showed a general increase in the storage modulus of the PMCs with increasing CNC content. These relative differences in storage modulus were even more evident at higher temperatures. Uniaxial tensile testing of the PMCs found a notable increase in Young's modulus between the 3.6 wt% CNC PMC (240 ± 50 MPa) and the 11.4 wt% CNC PMC (391 ± 7 MPa), while the elongation at break decreased from the 3.6 wt% CNC PMC (400 ± 90%) to the 11.4 wt% CNC PMC (70 ± 10%). All PMCs showed similar yield strengths of ca 10 MPa. These mechanical properties showed that the method of dispersing CNCs in LLDPE reported herein affords the highest moduli reported thus far in LLDPE–CNC PMCs. The ability of the catalyst to incorporate co‐monomer olefins may allow for the incorporation of smart CNCs into ethane‐based polymers. © 2020 Society of Industrial Chemistry

中文翻译：

锚固茂金属线性低密度聚乙烯纤维素纳米晶体复合材料

纤维素纳米晶体（CNCs）在不同负载量的茂金属催化剂作用下功能化并进行原位处理乙烯和1-己烯聚合可得到线性低密度聚乙烯（LLDPE）聚合物基复合材料（PMC）。通过热重分析确定了CNC含量，证实了PMC的CNC含量在3.6到11.4 wt％之间变化。差示扫描量热，凝胶渗透色谱和NMR光谱分析表明，这些PMC的LLDPE（基质）成分具有相似的物理特性。动态力学分析表明，随着CNC含量的增加，PMC的储能模量普遍增加。在较高温度下，储能模量的这些相对差异甚至更加明显。PMC的单轴拉伸测试发现，在3.6 wt％的CNC PMC（240±50 MPa）和11.4 wt％的CNC PMC（391±7 MPa）之间，杨氏模量显着增加，而断裂伸长率则从3.6 wt％的CNC PMC（400±90％）降至11.4 wt％的CNC PMC（70±10％）。所有PMC都显示出相似的屈服强度约10 MPa。这些机械性能表明，本文报道的在LLDPE中分散CNC的方法提供了迄今为止在LLDPE-CNC PMC中报道的最高模量。催化剂结合共聚单体烯烃的能力可能使智能CNC结合到乙烷基聚合物中。©2020工业化学学会

更新日期：2020-10-19

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