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Digitale Medien

Benzoxazole-2-thiol/dibenzoyl peroxide combination as photoinitiator for methyl methacrylate polymerization (1992)

Sengupta, Pranab K. ; Ray, Gour M. Singha

New York : Wiley-Blackwell

Die Makromolekulare Chemie 193 (1992), S. 31-41

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ISSN: 0025-116X

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Benzoxazole-2-thiol (1)/dibenzoyl peroxide (Bz2O2) was used as photoinitiator for the polymerization of methyl methacrylate (MMA) in bulk and in solution. The study of initiator decomposition was conducted spectrophotometrically. Kinetic studies of the photopolymerization indicated the formation of a complex between 1 and Bz2O2 in the stoichiometric ratio 2:1. The initiation is believed to occur via in situ formation of bis(benzoxazol-2-yl) disulfide in the presence of light.

Zusätzliches Material: 8 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/macp.1992.021930103

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Digitale Medien

A dynamic mechanical study on unidirectional carbon fiber-reinforced polypropylene composites (1994)

Sengupta, P. K. ; Mukhopadhyay, D.

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 51 (1994), S. 831-840

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ISSN: 0021-8995

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Fiber-reinforced polymer composites show high specific strength and stiffness. The alignment of reinforcing fibers results in anisotropy of the material. This anisotropic behavior has been studied through dynamic mechanical analysis of unidirectional carbon fiber-reinforced polypropylene (CFRPP) composites measured in both parallel and transverse directions to fiber arrangement. Several parameters such as storage modulus (E′), loss modulus (E″), loss factor or damping factor (tan δ), and complex viscosity (MU*) have been determined over a wide range of frequencies and at a fixed temperature. Relaxation and retardation spectra have been constructed for these composites. Modulus enhancement occurs due to stiffness imparted by the fiber and efficient stress transfer at the interface. Relaxation of the polymer matrix ceases with increase in the volume fraction of the fibers. α′-relaxation is observed for the composite having a 13% volume fraction of fibers and is ascribed to relaxation in the crystalline phase where the additional crystallinity arises out of the transcrystalline growth at the fiber-matrix interface. There exists a good correlation between theroretical curves with the experimental ones. Relaxation and retardation spectra and the dynamic parameters determined for these composites show a good correlation with the volume fraction of fibers as well as the direction of the applied load. © 1994 John Wiley & Sons, Inc.

Zusätzliches Material: 11 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/app.1994.070510506

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Digitale Medien

A Convenient Synthesis of Centperazine, an Antifilarial Candidate Drug (1993)

Sengupta, Sreela ; Sahu, Devi Prasad ; Chatterjee, Sunil Krishna

Weinheim : Wiley-Blackwell

Liebigs Annalen 1993 (1993), S. 437-439

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ISSN: 0170-2041

Schlagwort(e): Centperazine ; Antifilarial drug ; 6H-Pyrazino[1,2-c]pyrimidines ; Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: 7-Ethyl-octahydro-2-methyl-6H-pyrazino[1,2-c]pyrimidin-6-one (centperazine) (1), an antifilarial candidate drug, currently undergoing phase II clinical trials, has been synthesized by a more economically viable alternative route. Condensation of N,N′-dibenzylethylenediamine (2) with 3,4-dibromobutyronitrile (3) gives 2-(1,4-dibenzyl-2-piperazinyl)acetonitrile (4), which, on catalytic reduction, debenzylation, cyclocarbamation and N-alkylation yields the target molecule 1 in 10.1% overall yield.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/jlac.199319930171

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