Study on the synthesis, characterization, and kinetic of bulk polymerization of disproportionated rosin (β‐acryloxyl ethyl) ester

Frontal polymerization (FP), a propagating reaction wave driven by exothermic polymerization, is increasingly considered for the rapid fabrication of fiber-reinforced composites. However, the effect of the fibers on the FP reaction has not yet been explored. In this contribution, we demonstrate that thermally conductive continuous elements accelerate FP using an experimental model system and finite-element-based numerical simulations. Furthermore, the degree of acceleration is shown to be affected by the amount of available monomer in the system. These results suggest that thermally conductive carbon fiber reinforcement may facilitate FP for composite manufacturing.

“…The thermochemical model adopted in this numerical study starts with the following cure kinetic model:

\frac{dα}{dt} = A \cdot \exp ((), \frac{- E}{italicRT}) \cdot f ((), α),

f ((), α) = {(1 - α)}^{n},

Section: Computational Modelingmentioning

confidence: 99%

Frontal polymerization accelerated by continuous conductive elements

Goli

Robertson

Agarwal

et al. 2018

“…Acrylic copolymers have been widely utilized for PSAs in the automotive, electronics, and medical pharmaceutical industries because of low‐cost, good resistance to light and oxygen, main products include protective foils, labels, PSA tapes, and medical adhesive products . However, the common acrylic PSAs are composed by multiblock linear copolymers, which have low heat‐resistant properties . In order to improve the heat resistance, the flexibility of acrylic PSAs chains should be restricted under high temperature.…”

Section: Introductionmentioning

confidence: 99%

“…4 However, the common acrylic PSAs are composed by multiblock linear copolymers, which have low heat-resistant properties. 5 In order to improve the heat resistance, the flexibility of acrylic PSAs chains should be restricted under high temperature. In other words, the key to obtain heat-resistant acrylic PSAs is to form enough cohesion strength.…”

Section: Introductionmentioning

confidence: 99%

Heat resistance of acrylic pressure‐sensitive adhesives based on commercial curing agents and UV/heat curing systems

Zhang

Yue

et al. 2018

The development of adhesive tapes that can be applied at high temperature is a major challenge for pressure‐sensitive adhesives (PSAs). To date, the heat resistance of PSAs has not been investigated in sufficient details. In this study, based on the relationship between curing structures and properties, a series of acrylic PSAs with excellent heat resistance were prepared. Commercial zirconium acetylacetonate (ZrACA), desmodur L75 (L75), and N,N,N′,N′‐tetrakis(2,3‐epoxypropyl)‐m‐xylene‐α,α′‐diamine (GA240) were employed as heat‐curing agents. Trimethylolpropane triacrylate (TMPTA) was used as ultraviolet (UV)‐curing agent to form semi‐interpenetration polymer network structures after UV exposure. The influences of different curing agents on the thermal stability, adhesion performance, gel fraction, and viscoelastic of PSAs were explored. The results showed that the PSAs cured by L75, GA240, and TMPTA exhibited excellent heat resistance. Especially, when the content of L75 was 1.0 wt %, the PSAs could be peeled off substrate without residues on substrate surface after treatment at 170 °C for 4 h, while the nonmodified acrylic PSAs possessed residues after treatment from 110 °C. The cured PSAs adhesive performance was evaluated showing maximum 180° peel strength of 16.7 N/25 mm comparable to current PSAs. These resulting PSAs showed high heat resistance and they are suitable for a broad range of special fields. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47310.

“…Nevertheless, even using hydrogenated rosin in the reaction, the low content of unhydrogenated rosin would also retard the polymerization. Although polymerizable side chain can be introduced in rosin ring, its cost is higher . Considering these factors, blending method was used in this study.…”

Section: Introductionmentioning

confidence: 99%

Hydrogenated rosin ester latexes/waterborne polyacrylate blends for pressure‐sensitive adhesives

Zhang

Shang

Sun

et al. 2015

Diethylene glycol ester of hydrogenated rosin (DGE‐HR) emulsion was prepared via phase inversion method and then blended with waterborne (wb) polyacrylate for pressure‐sensitive adhesives (PSAs). The preparation conditions of DGE‐HR emulsion were studied. DGE‐HR emulsion with an average particle size of about 220 nm was obtained. Furthermore, the thermal, adhesive, and viscoelastic properties and the morphology of DGE‐HR/polyacrylate composite were investigated. Thermal analysis indicated that glass transition temperatures (Tg) of the DGE‐HR/polyacrylate blends became higher as the DGE‐HR content increased and DGE‐HR did not have a significant influence on thermal stability of the blend films. Atomic Force Microscopy (AFM) observation revealed that the DGE‐HR particles added had a good miscibility with acrylic particles. Additionally, for these tackified acrylic PSAs, positive correlations between mechanical performance and viscoelastic response at bonding and debonding frequencies were also found. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 42965.