Influence of a phosphorus-based methacrylate monomer on features of thermally curable self-adhesive structural tapes

Kowalczyk, Agnieszka; Kowalczyk, Krzysztof; Weisbrodt, Mateusz

doi:10.1016/j.ijadhadh.2018.07.002

Cited by 11 publications

(5 citation statements)

References 7 publications

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“…A particular kind of the SATs is those with self-adhesive features. They can be prepared, for example, via a UV-photo cross-linking process of reactive acrylate copolymers (obtained in classical free-radical copolymerization process initiated by 2,2′-azobis(isobutyronitryle) and in the presence of organic solvent) compounded with epoxy resin and latent curing agent [ 9 , 10 , 11 , 12 ]. Although the developed method of preparation and modification of SATs gives high results of adhesive and mechanical properties, in recent years a very strong emphasis has been placed on waste-free technologies.…”

Section: Introductionmentioning

confidence: 99%

Free-Radical Bulk-Photopolymerization Process as a Method of Obtaining Thermally Curable Structural Self-Adhesive Tapes and Effect of Used Type I Photoinitiators

2020

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A new fabrication method for thin (120 µm) thermally curable structural self-adhesive tapes (SATs) was demonstrated by utilizing a series of acrylic syrups (ASs) modified using Bisphenol A-based liquid epoxy resin. The acrylic syrups containing poly(butyl acrylate-co-butyl methacrylate-co-glycidyl methacrylate-co-2-hydroxyetyl acrylate-co-4-acryloyloxy benzophenone) were synthesized via free-radical bulk-photopolymerization (FRBP) process. Influence of different type I radical photoinitiators (PIs), i.e., α-hydroxyalkylphenones (HPs), acylphosphine oxides (APOs) and its mixtures (HPs/APOs and APO/APO) on selected physico-chemical features of obtained ASs was studied. It turned out that APO-type PIs are more effective in the FRBP process (NMR studies). Self-adhesive tests of SATs revealed that the monomers’ conversion in ASs have a significant influence on adhesion and tack. Moreover, the polymer structures formed at the UV cross-linking stage of SATs significantly affect the cross-linking degree of SATs during thermal curing (differential scanning calorimetry method). The highest values of overlap shear strength were achieved by SATs based on ASs with monomers’ conversion on the level 50–60%.

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Section: Introductionmentioning

confidence: 99%

Free-Radical Bulk-Photopolymerization Process as a Method of Obtaining Thermally Curable Structural Self-Adhesive Tapes and Effect of Used Type I Photoinitiators

2020

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“…Taking into consideration that the Tg value for ER is ca. −10 °C [42], the second/higher Tg value (Table 3) probably represents a glass transition process of a phase (consisting of a mixture of ER and selected chains of EA-POSS). In this case, it must be noted that the second Tg values for the EA-POSS-based SATs generally increased with increasing Tg value of the incorporated copolymers ( Table 2).…”

Section: Properties Of Thermally Uncured Sats With A-poss-based Epoxymentioning

confidence: 99%

“…We have previously reported that the Bisphenol A-based epoxy resin (ER) and the epoxyacrylate copolymer (EA-0) are miscible components of SAT compositions due to the polarity of the two comonomers, i.e., glycidyl methacrylate and 4-hydroxybutyl acrylate. The ER/EA-0 mixture was characterized by one T g value revealed by the DSC technique [42]. In this research, we modified the epoxyacrylate copolymer with the organic-inorganic A-POSS comonomer; the resulting EA-POSS copolymers were used for preparation of thermally curable pressure-sensitive adhesive films (SATs).…”

Section: Properties Of Thermally Uncured Sats With A-poss-based Epoxymentioning

confidence: 99%

Synthesis of Monoacryloxypropyl-POSS-based Hybrid Epoxyacrylate Copolymers and Their Application in Thermally Curable Structural Self-Adhesive Tapes

Kowalczyk

Gziut

2019

Polymers

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New organic-inorganic hybrid copolymers (EA-POSSs) based on butyl acrylate, glycidyl methacylate, hydroxybutyl acrylate, acryloiloxybenzophenone and acryloxypropylheptaisobutyl-POSS (A-POSS) were prepared via free-radical solution polymerization (FRP) and applied as a component of thermally curable structural self-adhesive tapes (SATs). The EA-POSS with 0.25, 0.5 or 1 mol % of A-POSS exhibited significantly higher dynamic viscosity (ca. +104%), Mw (+61%) and polydispersity (+109%; measured using gel permeation chromatography) as well as lower T g value (−16 • C) in relation to the A-POSS-free copolymer (EA-0). Differential scanning calorimetry (DSC) measurements (one glass transition process) confirmed statistic chain structure of the EA-POSS materials. Replacement of EA-0 by the EA-POSS copolymers in a SATs recipe caused simultaneous improvement of their self-adhesive features, i.e., adhesion (+70%), tack (+21%) and cohesion (+1590%). Moreover, the POSS-based copolymers improved the shear strength of thermally cured Al/SAT/Al overlap joints; the best mechanical resistance (before and after accelerated ageing tests) was observed for the sample containing 0.5 mol % of A-POSS (an increment range of 50-294% in relation to the A-POSS-free joints). Thermogravimetric analysis (TGA) revealed markedly improved thermal stability of the A-POSS-based SATs as well.

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“…A UV/heat dual-curable epoxy–acrylate adhesive containing the mentioned core-shell particles exhibits outstanding water resistance [ 15 ]. Applications of epoxyacrylate copolymers (based on BA, GMA, and 2-hydroxyethyl acrylate) prepared by a conventional radical polymerization process in an organic solvent [ 16 , 17 , 18 , 19 ] or by bulk photopolymerization [ 20 ] are also known. In the latter case, the acrylate-type modifier was used in the form of a prepolymer also called acrylic syrup (i.e., a solution of the copolymer in the unreacted monomers).…”

Section: Introductionmentioning

confidence: 99%

Epoxy-Based Structural Self-Adhesive Tapes Modified with Acrylic Syrups Prepared via a Free Radical Photopolymerization Process

et al. 2021

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New modifiers (i.e., acrylic syrups; ASs) of epoxy-resin-based thermally curable structural self-adhesive tapes (SATs) were prepared via a free radical bulk polymerization (FRBP) of n-butyl acrylate, butyl methacrylate, glycidyl methacrylate, and hydroxybutyl acrylate. In the process, two kinds of UV-photoinitiators (i.e., monoacylphosphine oxide/Omnirad TPO and bisacylphosphine oxide/Omnirad 819) and various mixing speed of the monomers mixture (200–1000 rpm) were applied. The TPO-based syrups exhibited a lower copolymers content (10–24 wt%), dynamic viscosity (<0.1 Pa·s), molecular weights (Mn and Mw, and polydispersity (1.9–2.5) than these with Omnirad 819. Additionally, the higher mixing speed significantly reduced monomers conversion and viscosity of ASs as well as molecular weights of the acrylate copolymers. These parameters influenced the properties of thermally uncured (e.g., adhesion) and thermally cured SATs (shear strength of aluminum/SAT/aluminum overlap joints). Better self-adhesive features were observed for SATs-TPO (based on ASs with lower monomers conversion, Mn and Mw); however, a slightly higher shear strength was noted for the thermally cured SAT-819 (ASs with higher monomers conversion, Mn and Mw). An impact of polydispersity of the acrylate copolymers as well as crosslinking degree of thermally cured SATs on the mechanical strength was also revealed.

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Influence of a phosphorus-based methacrylate monomer on features of thermally curable self-adhesive structural tapes

Cited by 11 publications

References 7 publications

Free-Radical Bulk-Photopolymerization Process as a Method of Obtaining Thermally Curable Structural Self-Adhesive Tapes and Effect of Used Type I Photoinitiators

Free-Radical Bulk-Photopolymerization Process as a Method of Obtaining Thermally Curable Structural Self-Adhesive Tapes and Effect of Used Type I Photoinitiators

Synthesis of Monoacryloxypropyl-POSS-based Hybrid Epoxyacrylate Copolymers and Their Application in Thermally Curable Structural Self-Adhesive Tapes

Epoxy-Based Structural Self-Adhesive Tapes Modified with Acrylic Syrups Prepared via a Free Radical Photopolymerization Process

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