本文關(guān)鍵詞： 動(dòng)態(tài)潤濕行為 界面相互作用 PS超薄膜 玻璃化轉(zhuǎn)變　出處：《浙江理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：高分子薄膜的厚度隨納米器件尺寸的減小而不斷降低。當(dāng)薄膜厚度降低到高分子鏈的尺度后,聚合物薄膜的玻璃化轉(zhuǎn)變行為會(huì)與本體發(fā)生偏離。界面效應(yīng)是影響聚合物薄膜玻璃化轉(zhuǎn)變溫度偏離本體的主要因素之一。并且隨著薄膜厚度的降低,界面效應(yīng)的影響愈加顯著。探究衡量界面相互作用強(qiáng)弱的物理參量能夠進(jìn)一步揭示界面效應(yīng)影響聚合物薄膜玻璃化轉(zhuǎn)變溫度的本質(zhì)。薄膜力學(xué)性能隨溫度變化,利用液滴動(dòng)態(tài)潤濕行為可以直接研究聚合物薄膜的玻璃化轉(zhuǎn)變溫度。本文通過改變PS鏈末端功能基團(tuán)種類和PS分子量來調(diào)節(jié)聚合物薄膜與基底的界面相互作用,利用液滴動(dòng)態(tài)潤濕行為及橢圓偏振儀研究了界面效應(yīng)對(duì)PS超薄膜玻璃化轉(zhuǎn)變行為的影響。結(jié)果發(fā)現(xiàn):(1)不同分子量端基化PS超薄膜在Si O2基底表面的Tjm均隨薄膜厚度的降低而降低。但是薄膜Tjm降低程度以及Tjm開始偏離本體的臨界厚度隨端基種類和PS分子量的不同而發(fā)生變化。當(dāng)分子量小于120 kg/mol時(shí),相同厚度下Tjm的次序?yàn)?HO-PS-OHHOOC-PS-COOHH-PS-H;臨界厚度的次序?yàn)?HO-PS-OHHOOC-PS-COOHH-PSH。并且相同厚度下分子量越小,HO-PS-OH和HOOC-PS-COOH薄膜的Tjm越高,臨界厚度越小;而H-PS-H薄膜Tjm的厚度依賴性與分子量無關(guān)。當(dāng)分子量大于120 kg/mol時(shí),不同端基化PS超薄膜Tjm的厚度依賴性基本相同�；着cPS鏈末端功能基團(tuán)間的界面相互作用差異是導(dǎo)致PS超薄膜具有不同玻璃化轉(zhuǎn)變行為的主要原因。利用橢圓偏振儀測得的結(jié)果與液滴動(dòng)態(tài)潤濕行為的結(jié)果非常相似。因此,液滴動(dòng)態(tài)潤濕行為測量聚合物薄膜玻璃化轉(zhuǎn)變溫度的方法是可行的且具有普適性的。(2)基底表面PS薄膜的吸附層厚度(Ra)與PS回轉(zhuǎn)半徑(Rg)的比值可作為衡量界面效應(yīng)影響聚合物薄膜玻璃化轉(zhuǎn)變溫度的主要參數(shù)之一。PS超薄膜Tjm的降低值(ΔTjm)隨Ra/Rg值的增大而線性增大;同時(shí),Tjm開始偏離本體的臨界厚度隨Ra/Rg值的增加而線性減小。本論文首次發(fā)現(xiàn)了Ra/Rg與聚合物薄膜玻璃化轉(zhuǎn)變溫度的關(guān)系,并且根據(jù)Ra/Rg值可以估測與基底間具有不同界面相互作用的聚合物薄膜的玻璃化轉(zhuǎn)變溫度。(3)界面效應(yīng)也對(duì)液滴在聚合物薄膜表面的stick-slip行為產(chǎn)生影響。不同分子量端基化PS超薄膜的最大跳躍角(Δθmax)隨薄膜厚度變化的斜率Kθ以及最大跳躍角(△θmax)隨wetting ridge高度變化的斜率Kw均隨Ra/Rg值的增大而線性增大。表明界面相互作用越強(qiáng),PS超薄膜的最大跳躍角(Δθmax)和wetting ridge高度隨薄膜厚度增大得越快。
[Abstract]:The thickness of the polymer film decreases with the decrease of the size of the nanodevices, and when the thickness of the film decreases to the scale of the polymer chain, The glass transition behavior of polymer films will deviate from the bulk, and the interfacial effect is one of the main factors that influence the transition temperature of polymer films deviating from the bulk, and with the decrease of film thickness, The influence of interfacial effect is becoming more and more obvious. The physical parameters which measure the strength of interfacial interaction can further reveal the nature of interfacial effects on the glass transition temperature of polymer films. The mechanical properties of the films vary with temperature. The glass transition temperature of polymer films can be studied directly by using the dynamic wetting behavior of droplets. In this paper, the interface interaction between polymer films and substrate is regulated by changing the type of functional groups at the end of PS chain and the molecular weight of PS. The effect of interfacial effect on glass transition behavior of PS ultrathin films was investigated by using droplet dynamic wetting behavior and ellipsometry. The results show that Tjm of PS ultrathin films with different molecular weights on the surface of Sio 2 substrates all depend on the thickness of the films. However, the decrease of Tjm and the critical thickness of Tjm begin to vary with the type of terminal group and the molecular weight of PS. When the molecular weight of the film is less than 120 kg/mol, The order of Tjm at the same thickness is: HO-PS-OHHOOC-PS-COOHH-PS-Hand the critical thickness is in the order of: HO-PS-OHHOC-PS-COOHH-PSH. The smaller the molecular weight of HO-PS-OH and the higher the critical thickness of HOOC-PS-COOH films, the lower the critical thickness of HO-PS-OH and HOOC-PS-COOH films at the same thickness, while the thickness dependence of H-PS-H film Tjm is independent of the molecular weight. When the molecular weight is more than 120 kg/mol, the critical thickness of HO-PS-OH and HOOC-PS-COOH films is lower. The thickness dependence of PS ultrathin film Tjm with different terminal groups is basically the same. The difference of interface interaction between the substrate and the functional groups at the end of PS chain is the main reason for the different glass transition behavior of PS ultrathin film. The ellipse is used to make use of the ellipse. The results measured by polarimeter are very similar to those of droplet dynamic wetting behavior. The method of measuring the glass transition temperature of polymer films by dynamic wetting behavior of droplets is feasible and universal. The ratio of the thickness of adsorption layer of PS film on the substrate surface Ra) to the radius of rotation of PS can be used as a measure of interfacial effect. The decreasing value of Tjm (螖 TJM) of PS ultrathin film increases linearly with the increase of Ra/Rg value. At the same time, the critical thickness of Tjm begins to deviate from the bulk and decreases linearly with the increase of Ra/Rg. In this paper, the relationship between Ra/Rg and glass transition temperature of polymer films is first found. Based on the Ra/Rg value, the glass transition temperature of polymer films with different interfacial interactions with the substrate can be estimated. The interface effect also affects the stick-slip behavior of droplets on the surface of polymer films. The slope K 胃 of the maximum jump angle (螖 max胃) with the thickness of the film and the slope K w of the maximum jump angle with the wetting ridge height increase linearly with the increase of the Ra/Rg value. It is shown that the stronger the interfacial interaction is, the stronger the interface interaction is. The maximum jump angle (螖 胃 max) and the height of wetting ridge increase faster with the film thickness.
【學(xué)位授予單位】：浙江理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TB383.2;TQ317

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 劉望龍;左彪;楊燕航;丁佳;王新平;沈之荃;;基底界面效應(yīng)對(duì)聚苯乙烯薄膜分子運(yùn)動(dòng)行為的影響[J];中國科學(xué):化學(xué);2013年10期

相關(guān)碩士學(xué)位論文 前2條

1 鄭翻番;基底性質(zhì)對(duì)聚合物薄膜表面結(jié)構(gòu)形成及其性能的影響研究[D];浙江理工大學(xué);2013年

2 劉英軍;熒光光譜法研究成膜條件影響聚合物薄膜玻璃化轉(zhuǎn)變溫度的機(jī)理[D];浙江理工大學(xué);2014年

，

本文編號(hào)：1524127