Synthesis and Nanomorphology of Tethered Block Copolymer Brushes

系统研究了栓系嵌段共聚物刷。 这项工作的动力源于初步的结果，其中聚苯乙烯嵌段聚（甲基丙烯酸甲酯）聚合物是由“接枝”的方法在硅酸盐基板上创建的。 与块选择性溶剂的治疗影响可逆的接触的变化，被解释在一个模型，放置在空气界面的聚苯乙烯或PMMA。 所提出的研究的目的是确认该系统的推测模型。 第一个目标是通过将膜厚度与Mp相关联、测定链长分散度、测定PS均聚物百分比以及更完整地表征纳米结构组成来更好地表征PS-b-PMMA衬套。 第二个目标是通过温度和溶剂的系统变化来研究表面重组的动力学。 第三个目标是开发嵌段共聚物刷的替代聚合方法。 第四个目标是通过包括新的单体（例如，氟化和水溶性单体）和栓系三嵌段共聚物的制备。 第五个目标是通过使用混合自组装单分子膜、微接触印刷或立体光刻来控制栓系嵌段共聚物的分布。 聚合物刷的合成和表征将对胶体稳定性产生很大影响，这对于稳定的乳液和胶乳制剂至关重要。 其他应用包括新型粘合剂、抗蛋白质生物表面、生物分子的色谱分离、润滑剂和聚合物共混物增容。*

A systematic investigation into tethered block copolymer brushes is proposed. The impetus for this work stems from preliminary results where a polystyrene-block-poly(methyl methacrylate) polymer was created by the "grafting-from" approach on a silicate substrate. Treatment with block-selective solvents effected reversible contact changes that were interpreted in terms a model that placed either polystyrene or PMMA at the air interface. The purpose of the proposed research is to confirm the speculative models for this system. The 1st goal is to better characterize the PS-b-PMMA bush by correlating film thickness with Mp, determination of chain length dispersity, determination of percent PS homopolymer and a more complete characterization of nanostructure composition. The 2nd goal is to study the dynamics of surface reorganization by a systematic variation in temperature and solvent. The 3rd goal is to develop alternative polymerization methods for block copolymer brushes. A 4th goal is to expand the composition of the tethered block copolymers by including new monomers (e.g., fluorinated and water-soluble monomers) and the preparation of tethered triblock copolymers. The 5th goal is to control the distribution of tethered block copolymers by using mixed self-assembled monolayers, microcontact printing or stereolithography.Successful completion of this proposed research will have several potential benefits to society. The synthesis and characterization of polymer brushes will have a large impact on colloidal stabilization, which is critical for stable emulsion and latex formulations. Other applications include new adhesives, protein-resistance biosurfaces, chromatographic separation of biomolecules, lubricants and polymer blend compatibilization.***