Synthesis and Characterization of Functionalized Polyethylene Surfaces

功能化聚乙烯表面的合成与表征

• 批准号: 9634196
• 负责人: David Bergbreiter
• 金额: $ 24.9万
• 依托单位: Texas A&M Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9634196&HistoricalAwards=false
• 关键词: Synthesis; Characterization; Functionalized; Polyethylene; Surfaces

9634196 Bergbreiter This grant will explore several new aspects of polyolefin surface modification. The initial stages of the proposed project will extend prior studies on "responsive" surfaces - surfaces that reversibly change hydrophilicity, adhesion and/or reactivity in response to external physical or chemical stimuli. By incorporating several different sorts of spectroscopic probes and by chemically tuning the structure of polymer grafts, it will be possible to test how to chemically control and manipulate solvation and reactivity at polymer surfaces. This chemistry will be explored with linear brush-like grafts. Second, a new approach to surface grafting using hyperbranched polymers will be studied. Preliminary work has already shown that hyperbranched grafting chemistry can generate heavily functionalized thin (10 - 150 nm) films of polymer grafts at surfaces. This chemistry can also be used to generate responsive surfaces and can, by design, incorporate spectroscopic labels either in the graft phase, at the graft/solvent interface or at the graft phase/substrate interface. Finally, known metallocene catalysts used in polypropylene polymerization make terminally functionalized stereoregular polypropylene oligomers readily available. Such oligomers can be synthetically modified and characterized using chemistry previously used to prepare terminally functionalized polyethylene oligomers. These terminally functionalized polypropylene oligomers will then be used to prepare surface functionalized polypropylene films by a blending approach whose utility has been established using polyethylene oligomers and a polyethylene host polymer. %%% This grant is in the area of polymer synthesis for design and modification of surfaces. This new approach to polypropylene functionalization can be used with the new sort s of chemical grafting chemistry to be developed in this proposal and in prior work. The result will be a new way to efficiently surface modify polypropylene. ***

该基金将探索聚烯烃表面改性的几个新方面。拟议项目的初始阶段将扩展先前对“反应性”表面的研究，即在外部物理或化学刺激下可逆地改变亲水性、附着力和/或反应性的表面。通过结合几种不同种类的光谱探针和化学调整聚合物接枝的结构，将有可能测试如何化学控制和操纵聚合物表面的溶剂化和反应性。这种化学反应将通过线状刷状接枝进行探索。其次，研究了一种利用超支化聚合物进行表面接枝的新方法。初步的工作已经表明，超支化接枝化学可以在表面产生高度功能化的聚合物接枝薄膜（10 - 150nm）。这种化学反应也可以用于生成响应表面，并且可以通过设计，在接枝相，接枝/溶剂界面或接枝相/底物界面上加入光谱标记。最后，已知的茂金属催化剂用于聚丙烯聚合，使得端功能化的立体规则聚丙烯低聚物很容易获得。这种低聚物可以使用先前用于制备端功能化聚乙烯低聚物的化学方法进行合成修饰和表征。这些末端功能化的聚丙烯低聚物将通过共混方法用于制备表面功能化的聚丙烯薄膜，该方法的实用性已经建立在使用聚乙烯低聚物和聚乙烯主体聚合物的基础上。该资助用于设计和修饰表面的聚合物合成领域。这种聚丙烯功能化的新方法可以与本建议和先前工作中开发的新型化学接枝化学相结合。这为聚丙烯表面改性开辟了一条新的途径。＊＊＊