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首页> 外文期刊>Journal of Applied Polymer Science >Apparent Low-Field Microwave Absorption Properties of Styrene-Based Copolymers Containing Acid Groups
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Apparent Low-Field Microwave Absorption Properties of Styrene-Based Copolymers Containing Acid Groups

机译：含酸基苯乙烯基共聚物的表观低场微波吸收特性

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摘要

The microwave absorption properties of polystyrene (PS) copolymers containing sulfonic and methacrylic acid groups were investigated using an electron magnetic resonance spectroscopy method. It was found that, unlike PS and poly(methyl methacrylate) homopolymers, the acid groups containing PS copolymers showed three electromagnetic resonance signals at 3250, 3035, and 520 G; the first and last two signals were thought to be due to the presence of anion radicals and acid groups in PS, respectively. This result indicated that the PS copolymers exhibited magnetic field dependent low-field microwave absorption behavior. This also suggested that the low-field microwave absorption required the presence of both the aromatic and acidic groups in the materials. To explain both the low-field absorption and magnetic field dependence, we proposed a coupled mechanism including both the magnetoplasticity associated with a plastic deformation and the rotational degree of freedom of aromatic groups containing electric dipoles with natural spin defects. (C) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 110: 3355-3359, 2008
机译：使用电子磁共振波谱法研究了含有磺酸和甲基丙烯酸基团的聚苯乙烯（PS）共聚物的微波吸收性能。已发现，与PS和聚（甲基丙烯酸甲酯）均聚物不同，含酸基团的PS共聚物在3250、3035和520 G处显示三个电磁共振信号;前两个信号被认为分别是由于PS中存在阴离子自由基和酸基。该结果表明PS共聚物表现出磁场依赖性的低场微波吸收行为。这也表明低场微波吸收要求材料中同时存在芳族基团和酸性基团。为了解释低场吸收和磁场的依赖性，我们提出了一种耦合机制，该机制既包括与塑性变形相关的磁塑性，也包括含有具有自然自旋缺陷的电偶极子的芳香族基团的旋转自由度。 （C）2008 Wiley Periodicals，Inc. J Appl Polym Sci 110：3355-3359，2008

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