Cationically UV-Cured Epoxy Composites

Atif, Muhammad; Bongiovanni, Roberta Maria; Yang, Jinshan

doi:10.1080/15583724.2014.963236

Cited by 48 publications

(23 citation statements)

References 106 publications

(72 reference statements)

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“…These works mainly considered static thin lms. 1,4,10,17 Due to the limited penetration of UV radiation into organic materials, it is difficult to prepare sample of super thickness or a large quantity of samples by cationic photopolymerization. However, provided that a large quantity of sample is irradiated without curing, it is possible to photolyze all the photoinitiator in it with stirring.…”

Section: Resultsmentioning

confidence: 99%

“…However, cationic photopolymerization exhibits some advantages over free-radical photopolymerization, 1,7,8 such as the absence of air inhibition, a "dark-curing" reaction, low levels of toxicity and irritation, a lower volume shrinkage during photopolymerization and so on. These peculiarities of cationic photopolymerization have attracted scientists' growing interest in researching it.…”

Section: -6mentioning

confidence: 99%

“…1,8,14,[16][17][18][19] However, the diffusion coefficient of these active centres is low, 16,18,20,21 which means that curing thick samples, if it is possible at all, takes a long time or requires a high temperature. What is more, coloured additives like pigment or bres, especially dark colours, further reduce the ability of light to penetrate the solution and the rate of production of active centres, and thus the maximum thickness of dark-coloured samples that can be cured is limited.…”

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confidence: 99%

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Temperature controlled cationic photo-curing of a thick, dark composite

Yang

Nie

et al. 2017

RSC Adv.

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In this research, the cationic photopolymerization of 1,4-butanediol diglycidyl ether was found to have an infinitely long induction period due to the sustained stability of the secondary oxonium ions species at low temperature. Based on this, the system could be separated into two steps: photolysis of the photoinitiator without polymerization under irradiation and polymerization in the dark. Under irradiation, only the secondary oxonium ion species was generated at low temperature, whereas the polymerization could proceed and auto-accelerate at room temperature without irradiation. The two steps could be monitored by a significant change of the temperature. The temperature controlled cationic mechanism resolved the issue of light penetration in colored thick composites. Through temperature control, the infinitely thick and dark material could be prepared by cationic photopolymerization.

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Section: Resultsmentioning

confidence: 99%

Section: -6mentioning

confidence: 99%

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confidence: 99%

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Temperature controlled cationic photo-curing of a thick, dark composite

Yang

Nie

et al. 2017

RSC Adv.

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“…UV cationic epoxy adhesives are primarily composed of epoxy resin and cationic photoinitiator [16][17][18][19][20]. Cycloaliphatic-type epoxy resins are usually selected for UV cationic epoxy adhesives because of faster cationic polymerization rate than that of normal bisphenol A diglycidyl ethertype epoxy resin.…”

Section: Uv Cationic Epoxy Adhesivesmentioning

confidence: 99%

UV and Thermal Cure Epoxy Adhesives

Chen¹,

Li²,

Wang³

et al. 2019

Paint and Coatings Industry

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Typical commercial UV and thermal cure epoxy adhesives have been reviewed and compared. UV cure cationic epoxy adhesives are primarily composed of cycloaliphatic epoxy resin and cationic photoinitiator. UV cationic epoxy adhesives have no surface cure issue and possess low cure shrinkage and good adhesion performance but need post-thermal cure to achieve full adhesion performance in use. Hybrid UV acrylate and thermal cure epoxy adhesives are primarily composed of acrylate monomer, free radical photoinitiator, epoxy resin and curing agent. The hybrid epoxy adhesives combine fast UV curability of acrylate composition and high adhesion performance of thermal cure epoxy composition. A new type initiator free hybrid one-component UV and thermal cure adhesive has been also introduced. It is mainly composed of maleimide compound, acrylic monomer, partially acrylated epoxy resin, epoxy resin and latent curing agent. Its UV cure and thermal cure behaviour have been studied by FT-IR spectroscopy measurement.

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“…Further investigation is needed to cover unexplored areas in the field of photo-induced polymerization [34]. Radicals promote cationic photo-polymerization, since it h a sb e e nd e m o n s t r a t e dt ob eav e r ye f f e c t i v em e t hod for the preparation of well-defined high molecular weight epoxy resin [35].…”

Section: Anionic Polymerizationmentioning

confidence: 99%

Ionizing Radiation-Induced Polymerization

El-Sayyad¹

2018

Ionizing Radiation Effects and Applications

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Ionizing radiation can induce some kinds of reactions, other than polymerization, such as dimerization, oligomerization, curing, and grafting. These reactions occur through a regular radical chain causing growth of polymer by three steps, namely, initiation, propagation, and termination. To understand ionizing radiation-induced polymerization, the water radiolysis must be taken into consideration. This chapter explores the mechanism of water molecules radiolysis paying especial attention to the basic regularities of solvent radicals' interaction with the polymer molecules for forming the crosslinked polymer. Water radiolysis is the main engine of the polymerization processes, especially the "freeradical polymerization." The mechanisms of the free-radical polymerization and crosslinking will be discussed in detail later. Since different polymers respond differently to radiation, it is useful to quantify the response, namely in terms of crosslinking and chain scission. A parameter called the G-value is frequently used for this purpose. It represents the chemical yield of crosslinks, scissions and double bonds, etc. For the crosslinked polymer, the crosslinking density increases with increasing the radiation dose, this is reflected by the swelling degree of the polymer while being immersed in a compatible solvent. If crosslinking predominates, the crosslinking density increases and the extent of swelling decreases. If chain scission predominates, the opposite occurs. A further detailed discussion of these aspects is presented throughout this chapter.

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Cationically UV-Cured Epoxy Composites

Cited by 48 publications

References 106 publications

Temperature controlled cationic photo-curing of a thick, dark composite

Temperature controlled cationic photo-curing of a thick, dark composite

UV and Thermal Cure Epoxy Adhesives

Ionizing Radiation-Induced Polymerization

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