| 扫描探针显微技术研究聚苯乙烯单链颗粒的力学响应 |
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| 引用本文： | 张青岭,杜滨阳,何天白. 扫描探针显微技术研究聚苯乙烯单链颗粒的力学响应[J]. 高分子学报, 2000, 37(5): 654-658 |
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| 作者姓名： | 张青岭 杜滨阳 何天白 |
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| 作者单位： | 中国科学院长春应用化学研究所高分子物理实验室,长春,130022 |
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| 基金项目： | 国家自然科学基金资助项目!(基金号 29874032) |
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| 摘 要： | 首先通过极稀溶液滴膜的方法得到了聚苯乙烯的单链颗粒 .之后 ,采用稍浓溶液得到了既有单链聚苯乙烯颗粒又有多链 (上千根 )聚苯乙烯颗粒的样品 .力调制技术显示单链聚苯乙烯颗粒比多链聚苯乙烯颗粒软 ;另一方面 ,对多链聚苯乙烯颗粒和聚苯乙烯本体的纳米压印实验结果表明二者的模量是近似的 .因此 ,可以得出单链聚苯乙烯颗粒比本体聚苯乙烯软 ,这说明存在于聚苯乙烯单链颗粒中的分子链内的缠结点密度不如存在于本体中的分子链间的缠结点密度大
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| 关 键 词： | 聚苯乙烯单链颗粒 扫描探针技术 力学响应 力调制 纳米压印 |
INVESTIGATING MECHANICAL RESPONSE OF SINGLE CHAIN POLYSTYRENE PARTICLES BY SCANNING PROBE TECHNIQUES |
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| ZHANG Qingling,DU Binyang,HE Tianbai. INVESTIGATING MECHANICAL RESPONSE OF SINGLE CHAIN POLYSTYRENE PARTICLES BY SCANNING PROBE TECHNIQUES[J]. Acta Polymerica Sinica, 2000, 37(5): 654-658 |
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| Authors: | ZHANG Qingling DU Binyang HE Tianbai |
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| Abstract: | Single chain polystyrene particles were obtained by dilute solution casting method.The sample with both single chain polystyrene particles and multi|chain (more than 1000 molecular chains) polystyrene particles was obtained by a little more concentrate solution.Force modulation technique showed that single chain polystyrene particles were softer than multichain polystyrene particles.On the other hand,nanoindentation experiments on multi|chain particles and bulk polystyrene manifested that the elastic modulus of multi|chain polystyrene particles was very close to that of bulk polystyrene.Therefore,it was concluded that single chain polystyrene particles were softer than bulk polystyrene,which indicated that the density of intrachain entanglement points in the single chain polystyrene particles was not as large as that of the interchain entanglement points in the bulk state. |
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| Keywords: | Single chain polystyrene particle Scanning probe technique Mechanical response Force modulation Nanoindentation |
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