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Lee, I. H.,Amaladass, P.,Choi, I.,Bergmann, V.,Weber, S. L.,Choi, T. L. Royal Society of Chemistry 2016 Polymer chemistry Vol.7 No.7
<P>A unique hierarchical evolution from single-line nanocaterpillars to multi-line nanocaterpillars and then to multi-line nanocaterpillars bearing a few long-chain branches was demonstrated by in situ nanoparticlisation of fully conjugated poly(2,5-dihexyloxy-1,4-phenylene)-block-poly(3-methylthiophene) (PPP-b-P3MT). PPP-b-P3MTs of various block ratios were successfully synthesised by the Grignard metathesis polymerization method; moreover, these block copolymers underwent spontaneous self-assembly during the polymerization owing to the solvophobicity or strong p-p interactions of the core block, i.e. P3MT. These in situ generated PPP-b-P3MT NPs were quite different from the previously reported NPs generated from poly(2,5-dihexyloxy-1,4-phenylene)-block-polythiophene (PPP-b-PT). AFM and TEM images revealed that PPP-b-P3MTs formed single-to multi-line nanocaterpillars, whereas PPP-b-PTs only formed shorter single-line nanocaterpillars. On the basis of PXRD and UV-vis data, we speculated that this interesting morphology of multi-line nanocaterpillars, resembling duplex DNA, arose from different packing modes and crystallinity as well as improved solubility of the P3MT core compared with the NPs containing the PT core.</P>
Lee, In-Hwan,Amaladass, Pitchamuthu,Choi, Tae-Lim The Royal Society of Chemistry 2014 Chemical communications Vol.50 No.59
<P>1D nanocaterpillar structures were spontaneously formed during the synthesis of fully conjugated poly(2,5-dihexyloxy-1,4-phenylene)-<I>block</I>-polythiophene due to the strong π–π interactions between the polythiophene blocks. With the elongation of the polythiophene block, nanostructures evolved from nanospheres to nanocaterpillars and their length and height increased with good control.</P> <P>Graphic Abstract</P><P>1D nanocaterpillar structures were spontaneously formed during the synthesis of fully conjugated poly(2,5-dihexyloxy-1,4-phenylene)-<I>block</I>-polythiophene due to the strong π–π interactions between the polythiophene blocks. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c4cc02787f'> </P>
Lee, In-Hwan,Amaladass, Pitchamuthu,Yoon, Ki-Young,Shin, Suyong,Kim, Yong-Jae,Kim, Inhye,Lee, Eunji,Choi, Tae-Lim American Chemical Society 2013 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.135 No.47
<P>Nanostar and nanonetwork crystals were prepared from fully conjugated poly(3-(2-ethylhexyl)thiophene)-<I>block</I>-polythiophene (P3EHT-<I>b</I>-PT) via a simple INCP process. The structural conformation of the nanocrystals was investigated in detail, revealing that with an increase in the block length of PT, the morphology of the nanocrystals changed from nanospheres to nanorods, nanostars, and to nanonetworks.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jacsat/2013/jacsat.2013.135.issue-47/ja409206p/production/images/medium/ja-2013-09206p_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ja409206p'>ACS Electronic Supporting Info</A></P>