The Stokes and anti-Stokes Raman spectra of the pristine and ion-implanted highly oriented pyrolytic graphite ͑HOPG͒ are reported. For all Raman bands, noticeable frequency shifts are observed in the different temperature of samples. The anomalous Raman phenomenon ͑ARP͒ indicates that some modes occurring on the Stokes and anti-Stokes sides have different frequencies for HOPG. The data suggest that the ARP is closely related with the excitation wavelength ͑͒ dependence of Raman bands of the graphite. According to the temperature effect and the ARP, we assign and verify some modes of HOPG, and predict some new results.

The Raman spectra of ion-implanted highly oriented pyrolytic graphite (HOPG) are reported, in which an additional mode at 1083 cm−1 and three doublet structures in the positions of ∼1350, ∼2450, and ∼2710 cm−1 are revealed. Noticeable frequency shifts are observed for all the Raman bands between the spectra excited with different laser powers, which are interpreted as the pure temperature effect and a downshift in the C–C stretching frequency induced by the thermal expansion. Moreover, the pure temperature effect (dω/dT)V without anharmonic contribution is achieved in pristine HOPG. The results suggest that the pure temperature effect without anharmonic contribution plays an important role in the frequency shifts with temperature.

A series of well-defined hybrid block copolymers PMACyPOSS-b-PMMA and PMAiBuPOSS-b-PMMA exhibiting high POSS weight contents have been synthesized by RAFT polymerization and further studied as modifiers for epoxy thermosets based on diglycidyl ether of bisphenol A. The hybrid block copolymers self-assembled within the epoxy precursors into micelles possessing an inorganic core and a PMMA corona. Thanks to the presence of the PMMA blocks that remain miscible until the end of the reaction, curing of the resulting blends afforded nanostructured hybrid organic/ inorganic networks with well-dispersed inorganic-rich nanodomains with diameters on the order of 20 nm. V C 2011 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: [4343][4344][4345][4346][4347][4348][4349][4350][4351][4352] 2011

In this article, the amphiphilic block copolymers containing polyhedral oligomeric silsesquioxane (POSS), namely PMAPOSS-b-PAA and PMAPOSS-b-P(AA-co-St), were synthesized consecutively by reversible addition-fragmentation chain transfer and selective hydrolysis, and characterized by 1 H NMR, 13 C NMR, Fourier transform infrared spectroscopy and gel permeation chromatography. In the presence of the nearly gradient styrene distribution along the hydrophilic block with a feed molar ratio of tert-butyl acrylate (tBA) to St being 10/1, patterned core-corona nanoparticles (NPs) were formed from the mixture of good/selective solvents (THF/ water) by a simple evaporation process at room temperature. With the extending of the co-block length, the self-assembled NPs exhibited phase separation behavior of spheres-dis-persed, onion-like and onion-cluster hierarchical structures in turn. However, while a change in the feed molar ratio occurred, it resulted in the formation of typical core-shell micelles (20/1, tBA/St) and disordered particles (5/1, tBA/St), respectively. Furthermore, the self-assembly behavior of PMA-POSS-b-P(AA-co-St) in DMF was investigated, which showed that it could perform a mixture morphology of well-dispersive sphere micelles and large aggregate of micelles. V C 2012 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 50: [4300][4301][4302][4303][4304][4305][4306][4307][4308][4309][4310] 2012

A simple route to organic–inorganic (O/I) nano‐objects with different morphologies through polymerization‐induced block copolymer self‐assembly is described. The synthetic strategy relies on the chain‐extension of polyhedral oligomeric silsesquioxanes (POSS)‐containing macro‐CTA (PMAiBuPOSS13 and PMAiBuPOSS19) with styrene at 120 °C in octane, a selective solvent of the POSS‐containing block. The polymerization system was proven to afford a plethora of O/I nano‐objects, such as spherical micelles, cylindrical micelles, and vesicles depending on the respective molar masses of the PMAiBuPOSS and polystyrene (PS) blocks. The cooling procedure was also proven to be a crucial step to generate particles with a unique morphology. © 2013 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2013, 51, 4558–4564

No abstract

The organic surfactant template method has been widely used for the preparation of CuO nanorods, nanotubes and nanowires. However, the surfactants in this system have no effect on the properties of the final products because they are flushed away. In this work, we used this method to synthesize a novel type of inorganic-organic hybrid nanowire via the hybridization between CuO and amphiphilic oligomer octadecyl, polyethylene glycol di-butenetrioate (O-B-EG-B). Here O-B-EG-B, as a structure director, was not flushed away but remained in the prepared hybrid nanowires because it was bound around CuO or entrapped in interior CuO. The hybrid nanowires showed CuO cores and P(O-B-EG-B) shells when the concentration of O-B-EG-B was 0.4 mg ml(-1), but exhibited P(O-B-EG-B) cores and CuO shells when the concentration of O-B-EG-B was 4.0 mg ml(-1). We found that the hybrid nanowires with P(O-B-EG-B) cores and CuO shells could sense a slight change in the relative humidity (RH) and respond by rapidly changing their conductivity. The resistance changed by about two orders of magnitude within the humidity range from 5% to 83.8%. Moreover, a humidity sensor based on this type of nanowire not only showed long-term stability but also exhibited excellent reversibility to moisture changes in air.

The facile preparation of novel supramolecular (ABAC)n multiblock copolymers from Hamilton wedge and barbiturate functionalized H-bonding RAFT agents is reported.