Journal ArticleDOI
Kinetics and mechanism of thermal polymerization of hexafluoropropylene under high pressures
A. A. Zharov,I. A. Guzyaeva +1 more
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TLDR
In this paper, the basic kinetic parameters of thermal polymerization of hexafluoropropylene, namely, general rate constants, degree of polymerization, and their temperature and pressure dependences in the range of 230-290 °C and 2-12 kbar (200-1200 MPa) were determined.Abstract:
The basic kinetic parameters of thermal polymerization of hexafluoropropylene, namely, general rate constants, degree of polymerization, and their temperature and pressure dependences in the range of 230–290 °C and 2–12 kbar (200–1200 MPa) were determined. The activation energy (E
act = 132±4 kJ mol−1) and activation volume (ΔV
0
≠ = −27±1 cm3 mol−1) were calculated. The activation energy of thermal initiation of polymerization was estimated. The reaction scheme based on the assumption about a biradical mechanism of polymerization initiation was proposed.read more
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Synthesis and antiproliferative activity of conformationally restricted 1,2,3-triazole analogues of combretastatins in the sea urchin embryo model and against human cancer cell lines.
Dmitry V. Demchuk,Alexander V. Samet,N. B. Chernysheva,Vladimir I. Ushkarov,Galina A. Stashina,Leonid D. Konyushkin,Mikhail M. Raihstat,S. I. Firgang,Alex Philchenkov,M P Zavelevich,Ludmila M. Kuiava,Vasyl F. Chekhun,Dmitry Yu. Blokhin,Alex S. Kiselyov,Marina N. Semenova,Victor V. Semenov +15 more
TL;DR: Compound 10ad' induced G2/M cell cycle arrest and apoptosis in human T-leukemia Jurkat cells via caspase 2/3/9 activation and downregulation of the antiapoptotic protein XIAP has been evaluated as another possible cell death mode.
Journal ArticleDOI
Perfluorinated polymers as materials of membranes for gas and vapor separation
TL;DR: In this paper, the authors considered gas permeation parameters of highly and modestly permeable perfluorinated polymers: their free volume estimated via different methods, peculiarity of sorption thermodynamics of these materials and possibilities to use them in several gas separation processes.
Journal ArticleDOI
Gas transport and free volume in hexafluoropropylene polymers
TL;DR: In this article, synthesis and physicochemical properties of two novel perfluorinated polymers: poly(hexafluoropropylene) (PHFP) and the copolymer of hexafluorsopropyl polypropylene (90 wt.), copoly-HFP-PFMVE (10 wt.) are reported.
Journal ArticleDOI
Gas diffusion characteristics as criteria of nonequilibrium state of amorphous glassy polymers
TL;DR: In this paper, three amorphous glassy polymers (polyetherimide Ultem-1000, polyhexafluoropropylene and poly(3,4-bis(trimethylsilyl)tricyclonon-7-ene) were subjected to different physical treatments (biaxial stretching, removal of residual solvent (drying), annealing, aging, etc.).
Journal ArticleDOI
Gas permeation, diffusion, sorption and free volume of poly(2-trifluoromethyl-2-pentafluoroethyl-1,3-perfluorodioxole)
Nikolay A. Belov,Roman Nikiforov,E. V. Polunin,Yu. E. Pogodina,I. Zavarzin,V.P. Shantarovich,Yu. P. Yampolskii +6 more
TL;DR: In this article, a homopolymer based on perfluoro(2-methyl-2-ethyl-dioxole) was synthesized at 50-60°C and high pressure (10 kbar).
References
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Journal ArticleDOI
Organic synthesis at high pressure
TL;DR: In this article, the authors recommend that all synthetic chemists should always consider pressure as one of the routine variables available to them, along with temperature, solvent, reaction time, catalysts, and so forth.
Book
Organic Synthesis at High Pressures
澄 松本,R. M. Acheson +1 more
TL;DR: The application of nucleophilic substitution reaction in organic synthesis is discussed in this paper, where basic principles and Mechanisms Apparatus and Operation Application of Nucleophilic Substitution Reactions at Saturated Carbon and Carbonyl Group are discussed.
Journal ArticleDOI
Radiation-induced polymerization of hexafluoropropylene at high temperature and pressure
TL;DR: In this paper, the radiation-induced polymerization of hexafluoropropylene was studied in the pressure and temperature ranges of 4,500-15,000 atm and 100-230°C, respectively.