Evaluation of the Exothermicity of Free Radical Photopolymerization through a RT-FTIR and PhotoDSC Study

Brito, M. de; Courtecuisse, François; Allonas, Xavier; Croutxé‐Barghorn, Céline

doi:10.2494/photopolymer.23.765

Cited by 3 publications

(2 citation statements)

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“…). The higher conversion of a , b , and c can be attributed to the exotherm generated by the FRP, which delayed the gel point, thus allowing the photopolymerization to proceed further . Indeed, the heat evolved during the photopolymerization process increases the temperature of the medium, a fact which appears to be quite noticeable in thick composite samples where thermal dissipation is less pronounced than for films.…”

Section: Resultsmentioning

confidence: 99%

Full control of polymer properties during the two‐stage on‐demand free‐radical photopolymerization of fiber‐reinforced polymers

Pierrel

Ibrahim

Croutxé‐Barghorn

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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The effect of a two‐step free‐radical photopolymerization of an acrylate resin on the polymer properties in the presence of glass fibers is studied. It is found that a first irradiation leading to a partial conversion is effective for the fabrication of a preimpregnated glass‐fiber composite, which can be further processed and fully polymerized through a second irradiation. DMA analysis evidences the formation of a first relatively soft polymer embedding unreacted double bonds during the preirradiation. Further process allows the completion of the photopolymerization together with a reinforcement of the polymer network. This obviously affects the final mechanical properties of the photocomposite. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2019, 57, 1440–1447

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Section: Resultsmentioning

confidence: 99%

Full control of polymer properties during the two‐stage on‐demand free‐radical photopolymerization of fiber‐reinforced polymers

Pierrel

Ibrahim

Croutxé‐Barghorn

et al. 2019

J. Polym. Sci. Part A: Polym. Chem.

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“…The main experimental method used in this study was differential scanning calorimetry (DSC). Isothermal DSC (photo-DSC) is one of the two methods (along with FTIR) most widely used for investigation of photopolymerization kinetics [22,23]. It reflects very accurately the influence of various factors on the kinetics at any reaction stage (on kinetic curves) and enables measurements at a wide temperature range.…”

Section: Introductionmentioning

confidence: 99%

Methacrylate-based polymer blends containing oligomeric 1,2-polybutadienes

Marcinkowska

Andrzejewska

2013

J Therm Anal Calorim

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Partly miscible polymer blends with semi-IPNs structure built from polydimethacrylate networks and hydroxyl-terminated liquid polybutadienes with predominant 1,2-structure (LBH) were prepared by photopolymerization method. Photopolymerization kinetics of dimethacrylate-LBH mixtures were monitored by DSC technique under isothermal conditions. Kinetic curves and related parameters, like polymerization rate and degree of double bond conversion were determined as functions of dimethacrylate structure, LBH molecular mass, and its content in the mixture as well as polymerization temperature. The photopolymerization kinetics and activation energy for the polymerization rate were discussed taking into account the phase separation occurring during the curing reaction. The extent of phase separation (based on T g 's measurements) depended on LBH content and dimethacrylate chemical structure. The effect of LBH content on hardness of polymer blends was also examined.

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Radiation Chemistry

Allonas

Croutxé‐Barghorn

Bögl³

et al. 2012

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Radiation‐Induced Polymerization 1.1. Introduction 1.2. Mechanisms 1.2.1. Initiation Processes 1.2.2. Free‐Radical Polymerization 1.2.3. Cationic Polymerization 1.2.4. Characterization Methods 1.3. UV and Visible‐Light Curing 1.3.1. Photoinitiators 1.3.2. Monomers and Oligomers 1.3.3. Additives 1.3.4. Typical Formulations 1.3.5. Equipment 1.3.6. Applications 1.3.7. Health, Safety, and Environment 1.4. High‐Energy‐Particle‐Induced Photopolymerization 1.4.1. Equipment and Definitions 1.4.2. Electron‐Beam Processes 1.4.3. Health, Safety, and Environment 1.5. Conclusion and Outlook 2. Irradiation of Foods and Feeds 2.1. Introduction 2.2. Capabilities of Food and Feed Irradiation 2.2.1. Prolongation of Shelf Life 2.2.2. Quarantine Measures 2.2.3. Control of Pathogenic Organisms 2.3. History 2.4. Effects of Food Irradiation 2.4.1. Induced Radioactivity 2.4.2. Chemical and Sensory Changes 2.4.3. Changes in Nutritive Value 2.4.4. Effects on Microorganisms 2.4.5. Toxicological Consequences 2.5. Regulations on the Irradiation of Foods and Feeds 2.5.1. The European Community 2.5.2. Federal Republic of Germany 2.5.3. Other Countries 2.5.4. International Organizations 2.5.5. Consumers 2.6. Industrial Irradiation of Foods and Feeds 2.6.1. Irradiation Plants 2.6.2. Costs 2.6.3. Present Level of Use 2.7. Inspection of Irradiated Foods

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Evaluation of the Exothermicity of Free Radical Photopolymerization through a RT-FTIR and PhotoDSC Study

Cited by 3 publications

References 5 publications

Full control of polymer properties during the two‐stage on‐demand free‐radical photopolymerization of fiber‐reinforced polymers

Full control of polymer properties during the two‐stage on‐demand free‐radical photopolymerization of fiber‐reinforced polymers

Methacrylate-based polymer blends containing oligomeric 1,2-polybutadienes

Radiation Chemistry

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