| 基板界面对PS/PMMA共混物薄膜相逆转组成比的影响 |
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| 引用本文： | 方健,孔祥明,郭宝华,胡平,谢续明. 基板界面对PS/PMMA共混物薄膜相逆转组成比的影响[J]. 高等学校化学学报, 2001, 22(1): 151-153 |
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| 作者姓名： | 方健 孔祥明 郭宝华 胡平 谢续明 |
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| 作者单位： | 清华大学材料科学与工程研究院, 教育部先进材料重点实验室, 化工系高分子研究所, 北京 100084 |
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| 基金项目： | 国家自然科学基金!(批准号 :2 96 0 40 0 4)资助 |
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| 摘 要： | 近年来高分子共混体系中的界面、表面效应逐渐引起了越来越多研究者的兴趣 .人们发现 ,当共混物薄膜厚度减至一定程度时 ,聚合物共混物薄膜中的相形态、相容性及相分离动力学与本体中有较大的不同[1～ 3] .基板界面作用对共混薄膜体系的热力学、动力学行为产生很大的影响 .我们以往的研究 [4 ,5]也发现 ,PP/EVAc(70 /30 )共混体系退火过程中 ,基板界面 (如玻璃 )作用可大大加速分散相(EVAc)粒子的粗化凝聚过程 .本研究用聚甲基丙烯酸甲酯和聚苯乙烯共混物的四氢呋喃溶液在不同基板介质 (如玻璃基板 ,PP基板 )上成膜 ,用相差显微镜观测了…
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| 关 键 词： | PS/PMMA共混物薄膜 相逆转 基板界面 界面张力 |
| 文章编号： | 0251-0790(2001)01-0151-03 |
| 收稿时间： | 2000-07-12 |
| 修稿时间： | 2000-07-12 |
Effect of Substrate on the Phase Inversion of PMMA/PS Blend Films |
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| FANG Jian,KONG Xiang-ming,GUO Bao-Hua,HU Ping,XIE Xu-Ming. Effect of Substrate on the Phase Inversion of PMMA/PS Blend Films[J]. Chemical Research In Chinese Universities, 2001, 22(1): 151-153 |
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| Authors: | FANG Jian KONG Xiang-ming GUO Bao-Hua HU Ping XIE Xu-Ming |
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| Affiliation: | Institute of Polymer Science, Department of Chemical Engineering, Engineering Laboratory of Advanced Materials Research Center, Tsinghua University, Beijing 100084, China |
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| Abstract: | The effect of substrate on the phase morphologies of PMMA/PSblend films was investigated by means of phase contrast microscope. PMMA/PSblend films were cast onto various substrates(such as glass substrate and PPsubstrate) by spin-coating with thickness of about 10 μm. It was observed that there was a large difference of the phase inversion region between the blend films cast on glass and on PPsubstrates. On glass substrate, the phase inversion occurred at about Φm=04(PSmass fraction) while at Φm=05 on PPsubstrate. This implies that there is a shift of the phase inversion region with the change of substrate in cast polymer blend films. In other words, phase inversion region depends on the substrate. ATR-FTIRanalysis was used to detect the composition of the surface and the bottom of the films(about 100 μm thick) obtained by evaporating solvent from the polymer blend solution. The ATR-FTIRspectra of the surface and the bottom of the PMMA/PSblend thin films cast on glass substrate and PPsubstrate showed that PMMAcomponent preferentially segregated to glass substrate and PScomponent was enriched on the PPsubstrate. This selective segregation was due to the difference of the wetting abilities of PSand PMMAon the two kinds of substrates. The polymer-substrate interfacial tension γ were calculated and the results supported the ATR-FTIRresults. It could be inferred that the shift of the phase inversion region with the change of the substrate in PMMA/PSblend film was due to the fact that the composition of the blend in the bulk changed, owing to the selective enrichment of one component of polymer blend to the substrate. In other words, the affinity between polymer and substrate can strongly influence the phase morphologies and the phase inversion region in polymer blend films. |
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| Keywords: | PMMA/PS blend films Phase inversion Substrate Interface tension |
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