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Author of Kinetic studies of free radical photopolymerizations with methacrylic monomers Kinetic studies of free radical photopolymerizations with methacrylic monomers by Maria Maura Tellez Rosas 1 edition.
Not in Library. Lists. Synergistic Free Radical Effects in Photoinitiated Cationic Polymerization James V. Crivello Chap DOI: /bkch Publication Date (Print): March 3, The second section discusses kinetic studies of the mechanism of free radical polymerizations. The third section covers cationic photopolymerizations, which along with free radical polymerizations, are being used in many industrial applications.
The fourth section is devoted to recent developments in novel photopolymeriztion chemistry. Photoinitiated Polymerization of Di- and Tetrafunctional Methacrylic Monomers in a SBS Matrix. Kinetic, Mechanistic, and Structural Aspects. Macromolecules32 (16), DOI: /maCited by: Kinetic studies of free radical photopolymerizations with methacrylic monomers.
Author: Rosas, Maria Maura Tellez. ISNI: Awarding Body: Manchester Metropolitan University Current Institution: Manchester Metropolitan University.
lu's 32 research works with citations and reads, including: Rapid Solid-State Photopolymerization of Cyclic Acetal-Containing Acrylates. An improved kinetic model is presented which accounts for radical trapping during the photopolymerization of multifunctional monomers such as diacrylates and dimethacrylates.
Following earlier suggestions, the model assumes that trapping of radicals behaves as a unimolecular first-order reaction. The novel feature is that the trapping rate constant is presumed to increase exponentially.
Photoinitiated Polymerization is divided into five sections. Free radical photopolymerizations command most of the interest and activity within the field and thus is discussed first. The second section discusses kinetic studies of the mechanism of free radical polymerizations.
The third section covers cationic photopolymerizations, which along with free radical polymerizations, are being used. The radical polymerization of methacrylic acid, acrylic acid and acrylamide in aqueous solution has been investigated.
Detailed kinetic models for both acrylic acid, AA, and methacrylic acid, MAA, have been developed applying the program PREDICITM.
Good. Masoud Sobani, Vahid Haddadi-Asl, Seyed-Ataollah Mirshafiei-Langari, Mehdi Salami-Kalajahi, Hossein Roghani-Mamaqani, Khezrollah Khezri, A kinetics study on the in situ reversible addition–fragmentation chain transfer and free radical polymerization of styrene in presence of silica aerogel nanoporous particles, Designed Monomers and Polymers.
Synthesis and Kinetic Studies on the Photochemical Behavior of Polymeric Mesoions from Novel Methacrylic Monomers and of Mesoionic Copolymers with Liquid Crystalline Properties August Absolute kinetic constants for H-transfer reaction with the binder, relative kinetic rate constants for radical–radical coupling, and average lifetimes for the radicals have been calculated.
In the initiation step, primary radicals R • are formed (with a rate constant k d and concentration dependent on efficiency of formation, reaction (1), Scheme ).In the next step, they add to monomer molecules with a rate coefficient k i (reaction (2), Scheme ).The rate of the addition of primary radicals to monomer molecules is usually very high (with k i much higher than k d), so.
A Modeling Investigation of Chain Length Dependent Termination during Multivinyl Free Radical Chain Photopolymerizations: Accounting for the Gel. Macromolecules38 Kinetics and Modeling of Methacrylic Acid Radical Polymerization in Aqueous Solution.
Kinetic studies on the preparation of polycarbonates in solution. Kinetic Studies on the Dilatometric-Free Radical Copolymerization of New Modified Laser Dye Monomer with Methyl Methacrylate and Characterization.
Anandkumar R. Kannurpatti's 11 research works with citations and reads, including: A study of the evolution of mechanical properties and structural heterogeneity of polymer networks formed. Thiol-vinyl photopolymerizations, which are free radical polymerization reactions between thiol (-SH) containing monomers and vinyl containing monomer (-C=C), represents a radical shift in polymerization mechanism that addresses all the disadvantages associated with acrylic polymerizations.
The parameter values ([CT]= M, k CTP = cm 3 /(mol s), k trap = cm 3 /(mol s), A trap =, where [CT] is the chain transfer agent concentration; k CTP and k trap are the kinetic constants for chain transfer to polymer and persistent radical accumulation, respectively; and A trap describes the rate and onset of persistent radical.
Axel H.E. Müller, in Comprehensive Polymer Science and Supplements, Other Acrylic Monomers. Kinetic investigations on acrylic monomers other than methacrylates is hampered by a variety of side reactions as well as the other problems described in Section The reactivity of the monomer, as well as the tendency to undergo side reactions, increases with the polarity of the side.
The current study reports on the kinetic analysis of the free-radical polymerization of several seven-membered cyclic ketene acetal monomers and in particular 2-methylene-1,3-dioxepane (MDO) and 5,6-benzomethylene-1,3-dioxepane (BMDO).
Such monomers are known to undergo a complete ring-opening to afford polyester chains by a radical pathway. Kinetic study of free radical bulk copolymerization of styrene-methyl methacrylate H. Khan and B. Wadehra Indian Institute of Petroleum, Dehra Dun, india (Received 6 November ; revised 24 July ) In an attempt to reveal the kinetic mechanism of free radical bulk copolymerization of styrene-methyl methacrylate (SMMA), experiments were conducted in sealed.
These data clearly indicate that the radical–cationic hybrid curing reaction can be performed in the presence of purely iodonium salt but it needs to be performed in air-free conditions.
Similar kinetic behavior was obtained by using EM4Si monomer, with a concomitant epoxy and methacrylic curing, under free air conditions, in the presence of. The kinetic features of the radical copolymerization of the ionic monomers with PEGDM are studied. It is shown that, with a growing fraction of the crosslinking agent in the monomer mixture, Wmax and Г increase regardless of whether the process occurs in bulk or solution.
Vishal Sipani, Alec B. Scranton, Dark‐cure studies of cationic photopolymerizations of epoxides: Characterization of the active center lifetime and kinetic rate constants, Journal of Polymer Science Part A: Polymer Chemistry, /pola, 41, 13, (), (). Kinetic Study of Free-Radical Polymerization of Multifunctional Acrylates and Methacrylates Mei Wen, Li Voon Ng, Jason A.
Payne, Lorraine F. Francis, L. Scriven and Alon V. McCormick Department of Chemical Engineering and Materials Science University of Minnesota, MN Abstract The conversion profiles of ultraviolet-induced polymeri.
Water-soluble, carboxylic acid monomers are known to exhibit peculiar kinetics when polymerized in aqueous solution. Namely, their free-radical polymerization rate is affected by several parameters such as monomer concentration, ionic strength, and pH.
Focusing on methacrylic acid (MAA), even though this monomer has been largely addressed, a systematic investigation of the effects of the above. The present work deals with the photopolymerization of 2-phenylethyl (meth)acrylates and estimation of their kinetic parameters. Formulations were made by independently homogenizing the monomers with photoinitiators of two different classes.
Two different compositions of photoinitiators were used to study the effect of concentration of photoinitiator on cure kinetics. In previous studies of the photopolymerization of methacrylic monomers by DSC, a value of the heat of polymerization equal to kJ/mol ( kcal/mol), was taken as a generic value for methacrylates [9, 12, 14, 15, 25, 31].
A value of kJ/mol has also been taken as a reference value for methacrylates . The Free Radical Polymerization of Methyl Methacrylate to High Conversions Stephen Thomas Balke (Chem.) (Royal Military College) Professor A.
HamielecIIII This dissertation describes an investigation into the free radical batch polymerization of methyl methacrylate to high conversion. The over. A kinetic investigation of the free radical crosslinking copolymerization was carried out using the following monomer systems: styrene/ethylene dimethacrylate, styrene/m‐diisopropenyl‐benzene and styrene/p‐ conversion curves of each individual monomer and the instantaneous composition of the copolymer formed were determined from vapor phase.
Apparent activation energies for the photopolymerizations have been determined from rate versus temperature data. A Photocalorimetry-Based Kinetic Study, ACS Omega, /acsomega Studies on the kinetics of free‐radical bulk polymerization of multifunctional acrylates by dynamic differential scanning calorimetry, Journal of Applied.
Kinetic studies of novel (meth)acrylic monomers. ACS National Meeting Book of Abstracts. UU ; Kinetics and mechanism of thiol-ene photopolymerizations with and without photoinitiators.
ACS National Meeting Book of Abstracts. UU Publications from Measurement of the dissolved oxygen concentration in acrylate monomers with a novel photochemical method, L. Gou, C. Coretsopoulos, and Alec B. Scranton. Reduction of oxygen inhibition in free-radical photopolymerization., L.
Gou, C. Coretsopoulos, and Alec B. Scranton A Photochemical Method to Eliminate Oxygen Inhibition in Photocured Systems, L. Gou and. α‐Alkylacrylic acids (RAA's) bearing n‐alkyl groups were found to homopolymerize with slower rates than acrylic and methacrylic acids to number‐average molecular, weight (M̄ n) of 10 4 or above.
When the α‐substituent was a branched alkyl group, the polymerization rate and M̄ n decreased further. Reactivities of RAA's in copolymerization were interpreted by steric and resonance. Drawe, P. Kinetic of the Radical Polymerization of Ionic Monomers in Aqueous Solution: Spectroscopic Analysis and Modelling.
Ph.D. Thesis, University of Göttingen, Göttingen, Germany, [Google Scholar] Barth, J.; Buback, M. SP-PLP-EPR Study into the Termination Kinetics of Methacrylic Acid Radical Polymerization in Aqueous Solution. Radical chain polymerization is a chain reaction consisting of a sequence of three steps: initiation, propagation, and termination.
The initiation step is considered to involve two reactions. The first is the production of free radicals by any one of a number of reactions. Author: Jean-Pierre Fouassier Publisher: Springer Science & Business Media ISBN: Size: MB Format: PDF, ePub, Docs Category: Technology & Engineering Languages: en Pages: View: Get Book.
Book Description: Volume three deals specifically with the role of monomers and resins in radiation curing. The nature of the backbone of ologomers leads to the ultimate physical. The aim of this study was to analyze the way in which a mechanistic kinetic model can take into account the effect of the linear polymer on the free-radical polymerization rate.
This is relevant for a kinetic description in the initial solution before phase separation, and in each one of the individual phases generated after phase separation.
Kinetic study of acrylic acid solution polymerization Kinetic study of acrylic acid solution polymerization Scott, Robert A.; Peppas, Nikolaos A. The kinetics of aclylic acid (AA)solution polymerizations were characterized under various polymerization conditions using differential scanning calorimetry.
The AA polymerization rate R, decreased with increasing pH over all pH. Radical polymerization of captodative (cd) substituted 2-acetamidoacrylic acid (1) was studied kinetically at 40°C. The rate constants of propagation (kp) and termination (kt) of 1 were estimated.
Living radical photopolymerizations for microfluidic devices: Synthesis of a novel methacrylic monomer iniferter and its application in surface photografting on crosslinked polymer substrates.
Modifying photocrosslinked networks with living free radical initiators. ACS National Meeting Book of Abstracts. DD .monomer photopolymerizations, a complete understanding of the kinetics and structural evolution is lacking.
Our lack of fundamental understanding of these systems is due, in part, to the insoluble, crosslinked network that forms, which renders analysis of the molecular weight distribution (MWD) of the backbone kinetic chains difﬁcult [9–12].The kinetic studies dealing with polymerizations of these classes were summarized and some problems in the kinetic studies were pointed out.
1. Introduction The kinetics of free radical polymerizations has been studied in detail kinds of monomer, modes of the addition of monomer to the propa.