These interactions affected the molecular weight of the prepared nanocomposites. At low concentrations the SiO(2) nanoparticles acted as chain extenders, increasing the molecular weight of PBSu, while at higher loadings they resulted in extended branching and crosslinking reactions, leading to gradually decreased molecular weights. Silica nanoparticles acted as nucleating agents, increasing the crystallization rate of PBSu. However, the degree of crystallinity was slightly reduced. Tensile strength and Young’s modulus were significantly increased with increasing SiO(2) content. The presence of the nanoparticles resulted in reduced PLX4032 mouse enzymatic hydrolysis rates compared

to pure PBSu, attributed to the smaller available organic surface, due to the incorporation of SiO(2), and to the existence of branched and crosslinked macromolecules. Dynamic mechanical and rheological properties were also extensively studied. (C) 2010 Wiley Periodicals, Inc. J Appl Polym Sci 119: 2010-2024, 2011″
“Excitation power dependent photoluminescence (PL) spectroscopy was employed to determine the thermal degradation of InGaN quantum wells (QWs) structure with different Si doping in well region. At a low excitation power density, PL intensity of undoped InGaN

well was significantly decreased, while those of interfacial and full Si-doped InGaN well were slightly Vorinostat in vitro reduced by rapid thermal annealing (RTA) process. However, Buparlisib ic50 PL measurement with high excitation power density showed that PL intensities of InGaN QWs regardless of Si doping were almost similar with/without RTA process. In addition, x-ray diffraction results indicated that Si-doping in well could improve the interfacial quality of InGaN QWs. Therefore, we suggest that Si doping suppress the generation of nonradiative recombination centers by thermal degradation at weaker localization states which could be easily filled by low excitation carriers. (C) 2010 American Institute of Physics. [doi:10.1063/1.3511712]“
“Phosphate tri (2,6,7-trioxa-1-phosphabicyclo [2.2.2] octane-1-oxo-4-methanol)

phosphate (trimer) and its microcapsules with MUF resin shell, respectively, were synthesized. Their structures were characterized by NMR, IR, and SEM analysis. Epoxy resins (EP) were modified with trimer, and its microcapsules to get the flame retardant EP, whose flammability and burning behavior were characterized by UL 94 and limiting oxygen index (LOI). About 20% of the trimer microcapsules were doped into EP to get 30.2% of LOI and UL 94 V-0. Thermal properties of the flame retardant EP were investigated with thermogravimetry (TG) and differential thermogravimetry (DTG). Weight loss behavior and thermal stability were characterized. For EP containing the trimer microcapsules, compared with EP containing trimer, incorporating melamine group into EP decreased weight loss and the maximum weight loss rate, increased the char yield and thermal stability.