Advanced Materials Research Vols. 396-398

Abstract: Enzymatic polycondensation of benzyl-2,2-bis(methylol) propionate and sebacic acid has been performed using lipase Novozyme-435 as the catalyst, subsequently enzymatic ring-opening polymerization was reacted by adding ε-caprolactone as the monomer in the same system. Then atom transfer radical polymerization (ATRP) from the macroinitiator combining α-bromoester of styrene was catalyzed by CuCl/2,2’-Dipyridyl to obtain the block copolymer successfully. The polymers obtained in different conditions were analyzed by 1HNMR and GPC.

Abstract: In order to finish some special operations, the chaotic vibrating motor with two-level partial blocks is constructed. Mechanism principles are designed and dynamics of mechanical model is analyzed by using Lagrange method. Based on the initial sensitivity, non-repetition and complexity of phase-trajectory, many characteristics of chaotic vibration are verified in the vibrating system. It is found the vibrating system with wide power spectrum can achieve some special properties like transient high-intensity, super high-intensity and large vibrating amplitude. It is important to overcome some work barriers and solve some technological bottlenecks of vibrating machinery.

Abstract: Solid-state photocycloaddition reactions between di-2-pyrones (1a-d) with benzophenone (2a) gave the corresponding oxetane derivatives (3a-d; 1:2 adducts) with high site- and regioselectivity across the C5-C6 and C5′-C6′ double bonds in 1 via the triplet excited state of 2a. The reactions were inferred by MO methods to be initiated by electrostatic interaction between the C6 position of 1a-d and the carbonyl oxygen of 2a at their ground states, and the solid-state interaction may be enhanced by electron density at carbonyl oxygen of the triplet 2a. The transition state (TS) analysis of the [2+2] cycloaddition reactions also suggested some triplet complex, and the high regioselectivity. The hydrogen-bonding interaction between 2a and 1a-d and the triplet reaction mechanism were also explained by the IR analyses and the quenching experiments, respectively.

Abstract: The poly (2-methoxy-5-(2-ethylhexyl oxy)-1, 4-phenylenevin- ylene) (MEH-PPV) was used as a secondary electron donor material in the poly (3-octylthiophene) (P3OT): graphene bulk-heterojunction photovoltaic cell. The XRD investigation of the active layer showed a well-organized intraplane structure with lamellae oriented normal to the substrate. The mechanism of charge transfer in the multi-donor PV cell was investigated; it shows that efficient energy transfer takes place from MEH-PPV to P3OT. The reason for the increase in the open-circuit voltage which dues to the band structure of BHJ where the energy level change of the highest occupied molecular orbital of the MEH-PPV: P3OT as multi-donor. The hybrid devices showed the energy conversion efficiency of the multi-donor BHJ solar devices with moderate amount of MEH-PPV. The surface roughness investigation indicated the morphology of the hybrid active layer film.

Abstract: A serial of novel star-shaped 2,4,6-trisubstituted 1,3,5-triazine (s-triazine) dendrimers were synthesized via step-by-step nucleophilic substitution starting from 2,4,6-trichloro-1,3,5-triazine, and were characterized by ¹H, ¹³C NMR, FT-IR and ESI-MS spectra. The crystal structures for 2b, 2d and 4c have been determined by X-ray diffraction analysis, which indicate that there are hydrogen bonding and short contact interactions existing in intermolecules result in forming three-dimensional network architecture. D NMR experiments demonstrate that symmetrical trialkylamino-s-triazine shows correlated rotations of its N(2-ethoxy-2-oxoethyl) groups, while unsymmetrical 2-R-4,6-bis(dialkylamino)-s-triazines display two non-equivalent N(2-ethoxy-2-oxoethyl) groups, issued from the restricted rotation about the created C(s-triazine)-N bonds, and was conformed by crystallographic data.

Abstract: One new Ruthenium and one known Iron bimetallic carbonyl clusters containing triphos (1,1,1-tris(diphenylphosphinomethyl)ethane) ligand have been prepared as catalyst to study the reduction of amide to amine. All clusters were characterized by elemental analysis, 1HNMR, 31PNMR and IR spectroscopy. The reduction of N,N-dimethylbenzamide and N,N-diethyl-(3-methyl) benzamide catalyzed by Ru and Fe carbonyl clusters were investigated at 100 ~ 110 °C for 24 ~ 28h, polymethylhydrogensiloxane (PMHS) as reduction agent. The products were analysized using GC-MS, IR and UV-vis spectroscopy and an excellent yield (97%) of N,N-diethyl- (3-methyl)benzamine was obtained when using 3 mol% of bimetallic ruthenium carbonyl cluster as catalyst. The data of IR and UV-vis show that the frameworks of clusters are not changed remarkably during the reaction.

Abstract: Some 4-substituted-2-aminothiazoles were prepared starting from aromatic ketones and thiourea in the presence of powered iodine. Then treating 4-substituted-2-aminothiazole with substituted benzaldehyde gave corresponding 2-aminothiazole derives Schiff bases in good yield.

Abstract: Rock mass is an irregular and disordered geological body. Quantitative study on rock fracture has always been an important part in the long-term research of rock mechanics. It has taken the soft rock roadway as a carrier which is located in the Mine of Gaojialiang in Ordos area. Fractal geometry is adopted in the quantitative analysis of the wall rock crack in the soft rock roadway. As the result shows, the distributions of wall rock crack in the soft rock roadway are fractal. Fractal dimension D reveals the properly distributed statistical characteristic values and D value curves with different depths determine the ranges of loose ring, which provides reliable theoretical basis for the loose ring theory.

Abstract: 1, 3-propanediol (1, 3-PD) is biologically synthesized by glycerol dehydratase (GDHt) and 1, 3-propanediol dehydrogenase (PDOR). In present study, the gldABC gene, encoding GDHt from Klebsiella pneumoniae and the yqhD gene, encoding PDOR isoenzyme from E.coli BL21 were cloned and co-expressed in E.coli JM109 using plasmid pSE380. The over-expressed recombinant enzymes were purified by nickel-chelate chromatography combined with gel filtration to study the properties. Optimal temperature and pH of recombinant GDHt with specific activity of 85.8 U/mg were 45 °C and 9.0; and optimal temperature and pH of recombinant YqhD with specific activity of 80.0 U/mg were 37 °C, 7.0. The microbial conversion of 1,3-PD from glycerol by this recombinant E. coli strain was studied and the production of 1,3-PD was about 28.0 g/l.

Abstract: Removed due to plagiarism. Original work "The sampling of ignitable liquids on suspects hands", published in Forensic Science International in 2010