原子力显微镜研究星型SEBS聚集体的表面形态变化

发布时间：2018-03-22 08:22

本文选题：SEBS　切入点：星型　出处：《精细化工》2017年02期 　论文类型：期刊论文

【摘要】：采用原子力显微镜(AFM),观察不同条件下星型苯乙烯-乙烯-丁烯-苯乙烯嵌段共聚物(简称SEBS)的甲苯溶液旋涂所得膜的表面形态,发现SEBS溶液质量浓度对膜表面形态起支配作用,随着SEBS质量浓度的增加,聚集体结构由单个大分子线团变为小球、二维网络以及连续膜;不同溶度参数的溶剂〔氯仿、甲苯、环己烷的溶度参数分别为9.3、8.9、8.2(cal/cm3)1/2〕可以改变表面聚集体的尺寸,随着溶度参数的降低,旋涂膜表面聚集体的高度不断下降,溶剂更易渗透至聚合物大分子链间;随着热处理温度的提高,聚集体向完美小球颗粒转化;超声波处理后立即旋涂所得的膜表面形态上会出现大量气泡和气孔。对比相同条件下,线型SEBS与星型SEBS所得的AFM图可以发现,星型SEBS由于空间位阻的影响,分子链运动能力差,所以较线型SEBS聚集态的尺寸小。
[Abstract]:Atomic force microscopy (AFM) was used to observe the surface morphology of the films prepared by spin coating of star styrene-ethylene-butene-styrene block copolymers (SEBSs) in toluene solution under different conditions. It was found that the mass concentration of SEBS solution had a dominant effect on the surface morphology of the films. With the increase of mass concentration of SEBS, the aggregate structure changed from a single macromolecular coil to a small sphere, two-dimensional network and continuous membrane; solvents with different solubility parameters (chloroform, toluene, toluene). The solubility parameters of cyclohexane were 9.3 ~ 8.9g / cm ~ (3 / 2), respectively. The size of surface aggregates could be changed. With the decrease of solubility parameters, the height of surface aggregates of spin-coating film decreased continuously, and the solvent was more easily permeated into polymer macromolecular chains. With the increase of heat treatment temperature, the aggregates are transformed into perfect pellets. After ultrasonic treatment, a large number of bubbles and pores will appear on the surface morphology of the film. The AFM diagrams obtained from linear SEBS and star SEBS show that the size of star SEBS is smaller than that of linear SEBS due to the influence of steric resistance and the poor mobility of molecular chains.
【作者单位】：常州大学材料科学与工程学院;
【基金】：江苏高校优势学科建设工程资助项目~~
【分类号】：O631

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