| 甲基丙烯酸甲酯共聚物的超产特性研究 |
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| 引用本文： | 胡建恺,周静,徐文英.甲基丙烯酸甲酯共聚物的超产特性研究[J].高分子学报,1992,0(5):551-556. |
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| 作者姓名： | 胡建恺 周静 徐文英 |
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| 作者单位： | 中国科学技术大学内耗与固体缺陷开放实验室; 中国科学技术大学材料科学和工程系 |
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| 摘 要： | 用超声脉冲回波法对甲基丙烯酸甲酯-甲基丙烯酸丁酯(MMA-BMA)、含交联剂的甲基丙烯酸甲酯-甲基丙烯酸(MMA-MAA)和苯乙烯-甲基丙烯酸(ST-MAA)等三类共聚物进行了超声衰减和声速实验研究.结果表明,随BMA含量的增加,MMA-BMA共聚物的超声衰减增大,而声速减小;交联剂的加入使共聚物MMA-MAA和ST-MAA的超声衰减明显增大.随着温度的升高,MMA-BMA的超声衰减单调缓慢增加,当温度上升到Tg时则急剧增大.Tg值随BMA的含量增加而降低.文章对上述结果给予了解释.
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| 关 键 词： | 超声衰减 声速 共聚物 交联 |
| 收稿时间： | 1991-01-08 |
ULTRASONIC BEHAVIOUR STUDIES ON METHYL METHACRYLATE COPOLYMERS |
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| HU Jian-kai,ZHOU Jing,XU Wen-ying.ULTRASONIC BEHAVIOUR STUDIES ON METHYL METHACRYLATE COPOLYMERS[J].Acta Polymerica Sinica,1992,0(5):551-556. |
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| Authors: | HU Jian-kai ZHOU Jing XU Wen-ying |
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| Institution: | Internal Friction and Solid Defects Laboratory; University of Science and Technology of China; Hefei; Post code: 230026; Department of Materials Science and Engineering; USTC; HeFei; Post code: 230026 |
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| Abstract: | Ultrasonic attenuation and velocities have been measured in three kinds of copolymers: Methyl methacrylate-Butyl methacrylate (MMA-BMA), Methyl methacrylate-Methyl acrylic acid (MMA-MAA) containing different kinds of crosslinkers and Styrene-Methyl acrylic acid (ST-MAA) containing crosslinker EGD and BA respectively.Experimental results indicate that ultraconic attenuation increases and velocity decreases in MMA-BMA as increasing BMA content. Adding crosslinkers EGD or BA in MMA-MAA and in ST-MAA, ultrasonic attenuation inbcreases,velocity decreases evidently. The glass transition temperature Tg in MMA-BMA shifts towards lower temperature as BMA content. increasing. |
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