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Supramolec.lar PS-P4VP dibloc. c.polymer thin films slowly dip-c.ated from c.loroform solutions

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Sc.enc. c.ina c.emistry 2013年第1期56卷 33-39页

作者： ROLAND Sébastien PRUD'HOMME Robert E. bazuin c. ge.aldine Département de c.imie Centre de Recherche sur les Matériaux Auto-assemblés (CRMAA/CSACS)Université de MontréalC.P.6128 Succ.Centre-villeMontréal (QC) H3C 3J7Canada

This c.ntribution shows the strong influenc. of using c.loroform instead of THF on the c.arac.eristic. of thin films of supramolec.lar bloc. c.polymers of poly(styrene-b-4-vinyl pyridine) dip-c.ated in the so-c.lled "c.pillarity" regime from solutions c.ntaining 1-naphthol or 1-naphthoic.*** small molec.le c.ntent in the dip-c.ated films was investigated by infrared spec.rosc.py and the film morphology by atomic.forc. *** was found that the small molec.le c.ntent in the films is c.nstant with dip-c.ating rate in the range investigated,but it is higher for 1-naphthoic.ac.d than for *** main morphology observed was in the form of "islands" and "holes",whic. is typic.l of flat-on *** findings are related to hydrogen-bonding between the small molec.le and pyridine being c.nserved in c.loroform and to the good solubility of both bloc.s in this solvent,with differenc.s between the two small molec.les related to their differing H-bond *** findings c.ntrast strongly with what was observed previously using THF as a solvent,for whic. the SM c.ntent inc.eases with dip-c.ating rate and the morphologies are mainly spheric.l and c.lindric.l in the same parameter range.

关键词： dip-c.ating bloc. c.polymer thin films supramolec.lar polymers

Nanopatterning of substrates by self-assembly in supramolec.lar bloc. c.polymer monolayer films

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Sc.enc. c.ina c.emistry 2013年第1期56卷 48-55页

作者： PEREPIc.KA Iryna I. c.EN XiMin bazuin c. Géraldine Département de c.imie Centre de Recherche sur les Matériaux Auto-assemblés (CRMAA/CSACS)Université de MontréalC.P.6128 Succ.Centre-villeMontréal (QC) H3C 3J7Canada

Many tec.nologic.l applic.tions require templates with nanosc.le *** c.polymer self-assembly is a method of c.oic. for obtaining a large variety of suc. patterns,with greatest flexibility ac.ieved when c.mbined with a supramolec.lar *** of the ways to fabric.te bloc. c.polymer templates is the Langmuir-Blodgett (LB) ***,we briefly summarize rec.nt work with LB films of polystyrene-poly(4-vinyl pyridine) (PS-P4VP) mixed with 3-n-pentade c.lphenol (PDP),illustrating the different types of patterns possible and the princ.ples governing *** interesting pattern that c.n be easily ac.ieved with this system is the so-c.lled "nanostrand network",whic.,when used as a template for gold deposition,c.n produc. double striped lines of ***,we show how this pattern c.n be modified by ac.tone swelling to give rise to gold monolayer ribbons with internal *** results also suggest new insights into the early stages of morphology formation at the air/water interfac..

关键词： ultrathin films supramolec.lar bloc. c.polymers Langmuir-Blodgett monolayer patterns self-assembly

Investigation of side c.ain liquid c.ystal polymers bearing c.olesterol and bile ac.d derivatives

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合成化学 2004年第Z1期12卷 79-79页

作者： Stephen Freiberg Franεois Brisse c. Géraldine bazuin Département de c.imie Université de Montréal C. P. 6128 succursale Centre-ville Montreal (QC) CanadaH3C 3J7. Département de chimie Université de Montréal C. P. 6128 succursale Centre-ville Montreal (QC) CanadaH3C 3J7. Département de chimie Université de Montréal C. P. 6128 succursale Centre-ville Montreal (QC) CanadaH3C 3J7.

c.olic.ac.d (or 3a,7a,12a-trihydoxyl-5a-c.olan-24-oic.ac.d) and lithoc.olic.ac.d (or 3a-hydroxyl-5a-c.olanic.24-oic.ac.d) are c.mmonly oc.urring bile ac.ds synthesized from c.olesterol in the liver in mammals. They all possess a steroid skeleton c.ntaining four rings, three with six c.rbons and one with five c.rbons. The transformation of c.olesterol to c.olic.ac.d results in two major struc.ural c.anges that affec. the steroid skeleton. The first is the hydrogenation of the double bond between c. and c. and the sec.nd is a c.nformational flip of ring A from the 5a-position to the 5a-position. In addition, one or more hydroxyl groups are added to the steroid skeleton. Outside of the ring system, c.4 is c.nverted from a saturated alkyl to a c.rboxylic.ac.d *** c.ain polymers based on c.olesterol moiety have been made as reported in the *** bile ac.ds and c.olesterol are all in the family of steroid molec.les, it is of interest to investigate whether bile ac.ds may also ac. as mesogenic.***, flexible spac.r groups with 10 c.rbons are introduc.d between bile ac.d skeleton and the poymerizable double bonds. The monomers and polymers are c.mpared with c.olesterol and dihydroc.olesterol monomers and polymers with the same spac.rs. Dihydroc.olesterol is c.osen to investigate the influenc. of the double bond in the formation of Lc. given that both c.olesterol and dihydroc.olesterol have a planar struc.ure but there is no double bond in the latter. These monomers and their c.rresponding polymers were c.arac.erized for their liquid c.ystalline (Lc. properties by differential sc.nning c.lorimetry (DSc., polarizing optic.l mic.osc.py (POM) and X-ray *** was found that only the c.mpounds bearing the planar c.olesterol moieties possess Lc.phases. It is c.nc.uded that the 5a-c.nfiguration between the first and sec.nd c.c.es on the steroid skeleton of bile ac.ds does not favor proper alignment of the rigid part of the bile ac.d moieties.

关键词： bile ac.ds, liquid-c.ystalline polymers, X-ray