U.S.-Romania Materials Research on Random and Block Ionomers: Morphology, Dynamics, and Self-Assembling

Int 00002472 Schlick，Shulamit这个美国-罗马尼亚的研究项目涉及底特律大学的Shulamith Schlick、罗马尼亚科学院有机化学中心的Ileana Dragutan和Asachi技术大学的Bogdan Simion escu，他们以离聚体系统的检查为特色。这个美国-罗马尼亚团队受益于ESR波谱(底特律)、自旋探针(布加勒斯特)和嵌段共聚物合成(Yassy)方面的互补专业知识。总之，研究人员将寻求解释所观察到的与膜材料Nafion中的大分子组织以及具有强疏水链段和强疏水链段的不同极性的离子嵌段聚合物在溶剂中的组织相关的令人困惑的特征。为此，研究人员计划：1)使用在布加勒斯特制备的全氟氮氧自旋探针来研究全氟离聚体(Nafion)的聚集；2)应用基于顺磁探针和ESR成像的ESR(电子自旋共振)方法来研究含有聚二甲基硅氧烷(PDMS)链段的嵌段共聚物的自组装和阳离子结合。他们还将研究聚二甲基硅氧烷-聚甲基丙烯酸(PSMS-PMAA)嵌段，其中甲苯作为PDMS嵌段的选择溶剂，水作为PMAA嵌段的选择溶剂。如果成功，结果将提高我们对离聚体微观结构的了解，并提供关于不同微结构区域动力学的新的定量信息。这些发现有望在燃料电池和生物分子学等领域具有潜在的工业应用价值。这个聚合物研究的国际项目通过使美国和中欧的专家能够结合互补的人才，并在共同感兴趣和能力强的领域共享研究资源，实现了促进科学知识的计划目标。

INT 00002472Schlick, ShulamithThis U.S.-Romanian research project involving Shulamith Schlick at the University of Detroit, Ileana Dragutan of the Center for Organic Chemistry, Romanian Academy of Sciences, and Bogdan Simionescu of Asachi Technical University features examination of ionomer systems. This U.S.-Romania team benefits from complementary expertise in ESR spectroscopy (Detroit), Spin probes (Bucharest) and block copolymer synthesis (Yassy). Together, the researchers will seek an explanation for observed yet puzzling characteristics related to macromolecular organization in the membrane material Nafion and the organization in solvents of various polarities of ionic block polymers with strongly hydorphilic segments and strongly hydrophobic segments. To accomplish this, the researchers plan to: 1) use perfluorinated nitroxide spin probes prepared in Bucharest to investigate aggregation of perfluorinated ionomers (Nafion) and 2) apply the methodology of ESR (electron-spin resonance) spectroscopy based on paramagnetic probes and ESR imaging to study self-assembly in and cation binding of block copolymers containing polydimethylsiloxane (PDMS) segments. They'll also study polydimethylsiloxane-poly (methyacrylic acid) (PSMS-PMAA) blocks in the presence of toluene as the selective solvent for the PDMS block and water as the selective solvent for the PMAA block. If successful, results should improve our knowledge of the microstructure of ionomers and provide new quantitative information about the dynamics of the different microstructural regions. Findings are expected to have potential industrial applications in areas such as fuel cells and biomemetics. This international project in polymer research fulfills the program objective of advancing scientific knowledge by enabling experts in the Untied States and Central Europe to combine complementary talents and share research resources in areas of strong mutual interest and competence.