scholarly journals Reactivity of short radicals at the initial stages of radical polymerization of allyl chloride: Chain growth versus addition to fullerene

2021 ◽  
Author(s):  
Diana R. Diniakhmetova ◽  
Rosa Kh. Yumagulova ◽  
Sergey V. Kolesov
Keyword(s):  
Radical Polymerization ◽  
Allyl Chloride ◽  
Chain Growth

Modelling the Complete Molecular Weight Distribution in Chain Growth Polymerizations

2016 ◽  
Vol 1819 ◽  
Author(s):  
Ramiro Infante-Martínez ◽  
Enrique Saldívar-Guerra ◽  
Odilia Pérez-Camacho ◽  
Maricela García-Zamora ◽  
Víctor Comparán-Padilla
Keyword(s):  
Molecular Weight ◽  
Free Radical ◽  
Radical Polymerization ◽  
Molecular Weight Distribution ◽  
Weight Distribution ◽  
Chain Transfer ◽  
Free Radical Polymerization ◽  
Experimental Program ◽  
Chain Growth ◽  
Coordination Polymerization

ABSTRACTThis work shows the development of several models for chain-growth polymerizations that admit the direct calculation of the complete molecular weight distribution of the polymer. The direct and complete calculation implies that no statistical mean values are employed as in the moments method neither numerical approximations like in the minimum-squared based methods. The free radical polymerization of ethylene (LDPE) and the coordination via metallocenes polymerization of ethylene (HDPE) are taken as examples for analysis.In the free radical polymerization case, the conventional scheme for chain-growth polymerization is adopted, with steps for initiation, propagation, chain transfer to small species and the additional step of chain transfer to dead chains [1]. The kinetic parameter are obtained from the open literature. Two kind of reactors were modelled: batch and continuous stirred tank reactor. For this last case, a simulation strategy was considered in which the run started from an initial known population of dead chains. Results show that typical non-linear polymerization profiles for the molecular weight distribution are obtained. For the coordination polymerization of ethylene via metalocenes, the standard coordination model was employed [2]. A two-site catalyst was considered and kinetic parameters reported in the open literature were used. For this study an experimental program in a lab-scale reactor was undertaken in order to obtain modelling data [3]. Results show that the standard model adequately reproduces the experimental data in the kinetic and molecular attributes of the polymer.

scholarly journals Micrometre-long covalent organic fibres by photoinitiated chain-growth radical polymerization on an alkali-halide surface

2018 ◽  
Vol 10 (11) ◽  
pp. 1112-1117 ◽  
Author(s):  
Franck Para ◽  
Franck Bocquet ◽  
Laurent Nony ◽  
Christian Loppacher ◽  
Michel Féron ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Alkali Halide ◽  
Chain Growth

Synthesis of biodegradable thermoplastic copolymers based on starch by atom transfer radical polymerization (ATRP): Monolayer chain growth on starch

2012 ◽  
Vol 65 (3-4) ◽  
pp. 210-218 ◽  
Author(s):  
Peyman Najafi Moghaddam ◽  
Amir Reza Fareghi ◽  
Ali Akbar Entezami ◽  
Mohammad Amin Ghaffari Mehr
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Chain Growth ◽  
Atom Transfer
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