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