Bases of the axiomatic theory of addition polymerization

Author(s):  
V. V. Shamanin



2008 ◽  
Vol 136 ◽  
pp. 175-190 ◽  
Author(s):  
M.A. Jothi Rajan ◽  
T. Mathavan ◽  
T.S. Vivekanandam ◽  
S. Umapathy ◽  
V. Ganesan ◽  
...  

Polymers are prepared by various methods. The method of preparation plays an important role in deciding many of the physical properties of polymers. In this work Poly (Methyl Acrylate), PMA, is synthesized by free radical addition polymerization in the presence a monomer, an initiator under the influence of ultrasound. Methyl Acrylate (E-Merck, India) of proper strength is mixed with aqueous sodium peroxodisulphate solution of known strength and the time of passage of ultrasound is varied in steps of 30 minutes and 10 samples of solid PMA are obtained for 10 different periods of passage of ultrasound. Solid PMA samples are purified and air-dried under clean environment. TGA, DTA measurements are done on all the 10 PMA samples. The thermal stability of PMA with the change in the time of passage of ultrasound is discussed quantitatively. The thermal stability of PMA, synthesized sonochemically shows better results over the thermal method of synthesis. However in this paper we report the measurements made on PMA samples synthesized at 30 and 300 minutes sonication periods respectively.



2012 ◽  
Vol 45 (7) ◽  
pp. 718-726 ◽  
Author(s):  
Maxim Bermeshev ◽  
Boris Bulgakov ◽  
Dmitry Demchuk ◽  
Marina Filatova ◽  
Lyudmila Starannikova ◽  
...  


2013 ◽  
Vol 457-458 ◽  
pp. 65-71
Author(s):  
Jing Ru Jia

The polyfunctional organic compounds 2- hydroxymethyl -1,4- butanediol (trihydric alcohol) and toluene diisocyanate -2, 4- diisocyanate (TDI) were taken as the raw materials in this study. A polyurethane dendrimer was synthesized by utilizing the difference in the reaction activity of two isocyanate groups of TDI at different temperatures. The polymerization process conditions were studied. The addition polymerization of para-position NCO groups occurred at 50 °C, and that of ortho NCO groups occurred at 90 °C. According to the structure of the dendrimer synthesized, methyl orange was used as the guest molecule. Consequently, the aqueous methyl orange showed a phase transfer. With the increase of dendrimer concentration, the transfer rate of methyl orange increased.





1964 ◽  
Vol 29 (6) ◽  
pp. 819 ◽  
Author(s):  
Herbert L. Costner ◽  
Robert K. Leik
Keyword(s):  


1995 ◽  
Vol 52 (4) ◽  
pp. 4549-4552 ◽  
Author(s):  
Wei-Jou Chen ◽  
Shu-Hsia Chen


2010 ◽  
Vol 19 (4) ◽  
pp. 151-157 ◽  
Author(s):  
Enrique Saldívar-Guerra ◽  
Ramiro Infante-Martínez ◽  
Eduardo Vivaldo-Lima ◽  
Antonio Flores-Tlacuahuac


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