Adsorption of Janus-Type Amphiphilic Cellulose Nanofibrils onto Microspheres of Semicrystalline Polymers
Adsorption of Janus-Type Amphiphilic Cellulose Nanofibrils onto Microspheres of Semicrystalline Polymers
复制标题
DOI：
10.1021/acs.macromol.1c01163
复制
发表时间：
2021-10-06
期刊：
影响因子：
5.5
通讯作者：
Kondo, Tetsuo
中科院分区：
文献类型：
--
作者：
Ishikawa, Gento;Tsuji, Tsubasa;Kondo, Tetsuo
纤维素纳米纤维(CNF)作为可持续的生物质纳米物体正受到越来越多的关注，被认为是亲水性的。近年来，水相反碰撞(ACC)已被用于从各种纤维素原料中制备Janus型两亲性纤维素纳米纤维(ACC-CNFS)。在本研究中，ACC-CNFS优先吸附在疏水等规聚丙烯(I-PP)微粒和线性低密度聚乙烯(LLDPE)上，表现出其独特的两亲性。这是通过在水介质中简单地将这些成分混合在一起来实现的。用激光共聚焦显微镜(CLMS)观察产物的形态。差示扫描量热法测定的热力学数据表明，I-PP/ACC-CNFS和LLDPE/ACC-CNFS的熔点均低于未处理的聚合物，表明ACC-CNFS与聚合物表面存在相互作用。CLMS证实，用ACC-CNFS覆盖聚合物颗粒似乎降低了它们的熔点。这一发现证明了合成聚合物材料和生物质纳米物体之间的新型融合的可能性。
Cellulose nanofibrils (CNFs), which are attracting increasing attention as sustainable biomass nano-objects, are believed to be hydrophilic. Recently, aqueous counter collision (ACC) has been used to produce Janus-type amphiphilic cellulose nanofibrils (ACC-CNFs) from various cellulosic raw materials. In the current study, ACC-CNFs were preferentially adsorbed onto hydrophobic isotactic polypropylene (i-PP) microparticles and linear low-density polyethylene (LLDPE), which demonstrated their characteristic amphiphilicity. This was achieved by simply mixing the constituents together in aqueous media. The products were visualized by confocal laser microscopy (CLMS). Thermodynamic measurements obtained by differential scanning calorimetry revealed that the melting points of i-PP/ACC-CNFs and LLDPE/ACC-CNFs were lower than those of the untreated polymers, which indicates interactions between the ACC-CNFs and the polymer surfaces. Coating the polymer particles with the ACC-CNFs-as confirmed by CLMS-appeared to reduce their melting points. This finding demonstrates the possibility of a novel fusion between synthetic polymeric materials and biomass nano-objects.