Nanoscale Morphology of Poly(styrene-ran-methacrylic acid) Ionomers: The Role of Preparation Method, Thermal Treatment, and Acid Copolymer Structure
Nanoscale Morphology of Poly(styrene-ran-methacrylic acid) Ionomers: The Role of Preparation Method, Thermal Treatment, and Acid Copolymer Structure
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DOI：
10.1021/ma062270t
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发表时间：
2007-04
期刊：
影响因子：
5.5
通讯作者：
Nicholas M. Benetatos;K. Winey
中科院分区：
文献类型：
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作者：
Nicholas M. Benetatos;K. Winey
本研究探讨了制备方法、热处理和单体结构在利用x射线散射和扫描透射电子显微镜（STEM）确定离子单体纳米级形貌中的重要性。采用室温溶剂铸造、高温溶剂铸造和沉淀三种不同的方法从溶液中分离出一种铜中和型聚苯乙烯-甲基丙烯酸（SMAA）离聚体，其纳米级结构形成速率不同。虽然两种溶剂铸造膜都表现出典型的离子散射和均匀的球形离子聚集体，但沉淀材料没有显示出离子散射峰，并且STEM成像检测到各种大小，形状和分离的富cu区域。退火后，析出材料的形貌与溶剂铸造制备的形貌难以区分，表明热处理使析出的Cu-SMAA离子单体的亚稳态形貌向低能态发展。接下来，i…
This study probes the importance of preparation method, thermal treatment, and monomer structure in determining the nanoscale morphology of ionomers using both X-ray scattering and scanning transmission electron microscopy (STEM). A Cu-neutralized poly(styrene-ran-methacrylic acid) (SMAA) ionomer was isolated from solution by three different methods (room temperature solvent casting, solvent casting at elevated temperature, and precipitation) having different rates of nanoscale structure formation. While both solvent cast films exhibit typical ionomer scattering and uniform spherical ionic aggregates via STEM, the precipitated material shows no ionomer scattering peak and STEM imaging detects Cu-rich regions of various size, shape, and separation. Upon annealing the precipitated material, the morphology becomes indistinguishable from that prepared by solvent casting, indicating that thermal treatment drives the metastable morphology of precipitated Cu-SMAA ionomers toward a lower energy state. Next, the i...