Two series of banana‐shaped liquid crystalline (LC) H‐bonded complexes HPm/CBn (i.e., bent‐core H‐bonded side‐chain homopolymer HP mixed with bent‐core covalent‐bonded small molecule CB) and CPm/HBn (i.e., bent‐core covalent‐bonded side‐chain homopolymer CP mixed with bent‐core H‐bonded small molecular complex HB) with various m/n molar ratios were developed. The bent‐core covalent‐ and H‐bonded structural moieties were homopolymerized in the banana‐shaped LC H‐bonded complexes HPm/CBn and CPm/HBn, respectively. The influences of m/n molar ratios (polymeric moieties vs. small molecular moieties) on the mesomorphic and electro‐optical properties of both banana‐shaped LC H‐bonded complexes HPm/CBn and CPm/HBn were investigated. The polar smectic phases could be achieved and stabilized by smaller contents of polymeric dopants in banana‐shaped LC H‐bonded complexes, such as HP1/CB10, HP1/CB15, CP1/HB10, and CP1/HB15, which possessed tunable spontaneous polarization (Ps) values according to the molar ratios of m/n, that is, lower Ps values obtained in H‐bonded complexes HPm /CBn and CPm / HBn with higher ratios of H‐bonded moieties (larger m/n molar ratios), respectively. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 764–774, 2010

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Two conjugated surfactants of monomer TF and polymer PTF with pendant thiol groups are synthesized for surface modifications of gold nanorods (GNRs). Cetyltrimethylammonium bromide (CTAB)‐GNRs (without surface‐modification) in aqueous solutions are prepared, and the original CTAB surfactant is replaced with TF and PTF due to their thiol‐gold grafting reactions. Surface‐modified TF‐GNRs and PTF‐GNRs in THF are obtained. UV‐visible spectra provide the grafting evidence of TF and PTF. Compared with TF‐GNRs, the PTF‐GNRs show better solubility and stability against aggregations of nanorods in THF. TEM and XPS confirm the existence of binding bonds between the sulfur groups of PTF and the gold surface in PTF‐GNRs. Compared with polymer surfactant (PTF), the faster PL emission decay in PTF‐GNRs match well with the PL quenching of PTF‐GNRs. Surface modifications are verified by UV‐visible, TEM, XPS, PL and lifetime measurements.

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