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961.
962.
Janus Graft Block Copolymers: Design of a Polymer Architecture for Independently Tuned Nanostructures and Polymer Properties
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Dr. Zi‐Hao Guo An N. Le Dr. Xunda Feng Youngwoo Choo Bingqian Liu Danyu Wang Zhengyi Wan Yuwei Gu Julia Zhao Vince Li Prof. Chinedum O. Osuji Prof. Jeremiah A. Johnson Prof. Mingjiang Zhong 《Angewandte Chemie (International ed. in English)》2018,57(28):8493-8497
The graft‐through synthesis of Janus graft block copolymers (GBCPs) from branched macromonomers composed of various combinations of homopolymers is presented. Self‐assembly of GBCPs resulted in ordered nanostructures with ultra‐small domain sizes down to 2.8 nm (half‐pitch). The grafted architecture introduces an additional parameter, the backbone length, which enables control over the thermomechanical properties and processability of the GBCPs independently of their self‐assembled nanostructures. The simple synthetic route to GBCPs and the possibility of using a variety of polymer combinations contribute to the universality of this technique. 相似文献
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Julia Pretula Krzysztof Kaluzynski Stanislaw Penczek 《Journal of polymer science. Part A, Polymer chemistry》2014,52(11):1614-1621
This is the second part of the article with a subtitle “… The First Synthesis” published by us previously. For this, second part, we have chosen copolymers with low proportion of (‐b‐) units, as well as random copolymers with substantial proportions of (‐b‐) units. This is in contrast to the part I, in which we mostly described alternating copolymerization. In this article, radical copolymerization of tetraethyl vinylidene phosphonate (B) with several vinyl/ethylenic monomers (M2), namely acrylamide, methacrylamide, methyl methacrylate, n‐butyl acrylate, n‐butyl methacrylate, and styrene has been described and reactivity ratios of monomers as well as the average length of the comonomer blocks (n) have been determined (r1 = 0). It has been found, that (as it should be) there is a proportionality between r2 (=km2M2/km2B) and n. Moreover, there is a proportionality between r2 (or n) and the comonomer (M2) “reactivity,” defined as the rate constant of M2 addition to the styrene radical. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52, 1614–1621 相似文献
965.
966.
Julia C. Tai Jenn-Huei Lii Norman L. Allinger 《Journal of computational chemistry》1989,10(5):635-647
The molecular mechanics calculations reported earlier for nitrogen heterocycles have now been extended to include the title compounds, and related molecules. It is in general possible to calculate these structures with an accuracy that compares favorably with experiment. 相似文献
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Journal of the Operational Research Society - 相似文献