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发布时间:2018-09-18浏览次数:

 

报告题目Polymerisation-Induced Self-assembly

Prof. Steven P. Armes

英国谢菲尔德大学

报告时间2018920日(周四)上午10:30

报告地点:材料楼210

 

报告摘要:

The efficient, reproducible synthesis of bespoke organic nanoparticles of controlled size, morphology and surface functionality in concentrated solution is widely regarded to be a formidable technical challenge. However, over the past decade we1-3 and others have shown that polymerisation-induced self-assembly (PISA) is a highly versatile, potentially scalable platform technology that enables this important problem to be addressed. In PISA, a soluble precursor 'A' block is chain-extended using a second monomer that forms an insoluble 'B' block in the chosen solvent (see Figure 1). As this second 'B' block grows in the monomer/solvent reaction mixture, micellar nucleation occurs at some critical chain length, leading to the formation of sterically-stabilized nanoparticles. Depending on the relative volume fractions of the 'A' and 'B' blocks, the copolymer morphology can be either spheres, worms or vesicles. In some cases, more exotic nanoparticles such as framboidal vesicles or lamellar platelets can also be obtained. Moreover, the basic principles of PISA are generic: such diblock copolymer nano-objects can be readily prepared in either water, ethanol or n-alkanes. In this talk, the focus is on PISA formulations conducted in non-polar media. In particular, we demonstrate that small-angle X-ray scattering (SAXS) is a powerful technique that (i) enables the rigorous characterization of spheres, worms and vesicles and (ii) can also shed light on the evolution in copolymer morphology during PISA.

1. N. J. Warren and S. P. Armes, J. Am. Chem. Soc., 2014, 136, 10174

2. M. J. Derry, L. A. Fielding and S. P. Armes, Prog. Polym. Sci., 2016, 52, 1

3. S. L. Canning, G. N. Smith and S. P. Armes, Macromolecules, 2016, 49. 1985

 

报告人简介:

Steven P. Armes教授分别于1983年和1987年获得英国布里斯托大学化学学士和博士学位。1987-1989年在美国洛斯阿拉莫斯国家实验室进行博士后研究。1989 -2004年在英国苏萨克斯大学任讲师、高级讲师和教授。2004年起任谢菲尔德大学教授。Armes教授在高分子可控合成、聚合诱导自组装和聚合物胶体复合粒子等方面都取得了杰出的成就。Armes教授已在J. Am. Chem. Soc.Angew. Chem. Int. Ed.等国际期刊发表了740余篇论文,总引用次数超过37,000次,H因子为104;受邀担任9个权威杂志的编委或顾问编委。他曾获得了多项国际奖励。Armes教授于20145月当选英国皇家科学院院士(FRS),是英国皇家科学院自创建以来第二位高分子科学领域的院士。