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。 Atomic force microscopy (AFM) was used to observe the surface morphology of the as-received styrene-ethylene-butylene-styrene block copolymer (SEBS) by spin coating. The results showed that the concentration of SEBS solution on the membrane surface Morphology dominated. With the increase of mass concentration of SEBS, the aggregates changed from single macromolecule into small sphere, two-dimensional network and continuous film. Solvents with different solubility parameters [chloroform, toluene, cyclohexane dissolved Degree parameters of 9.3, 8.9, 8.2 (cal / cm3) 1/2] can change the size of the surface aggregates, with the decrease of solubility parameters, the height of the surface of the spin-on coating aggregates decreased, the solvent more easily penetrate to the polymerization Macromolecular chains between the macromolecules. With the increase of the heat treatment temperature, the aggregates transformed into the perfect pellets. After the ultrasonic treatment, the surface of the membrane was spin-on and a large number of bubbles and pores appeared. Compared with the AFM images obtained by the linear SEBS and the star SEBS under the same conditions, it can be found that the star SEBS is smaller in size than the linear SEBS aggregation due to steric hindrance and poor mobility of the molecular chains.