Viscoelastic behavior and toughness of the DGEBA epoxy resin with 1,2-diaminocyclohexane: effect of functionalized poly(dimethylsiloxane), diglycidyl ether, PDMS-DGE, pre-reacted with 1,2-diaminocyclohexane

Arcos-Casarrubias, Jose Antonio; Vázquez‐Torres, Humberto; Granados-Olvera, Jorge Alberto; Cedeño, A.; Cervantes‐Uc, José Manuel

doi:10.1007/s00289-021-03607-y

Cited by 6 publications

(7 citation statements)

References 58 publications

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“…Infrared spectroscopy was used to monitor the curing reaction of DGEBA_DETA and epoxy/organoclay nanocomposites in the MIR and NIR regions throughout the curing cycle. In the epoxy‐amine system, the reduction in the band intensity at 916 cm −1 assigned to the COC group of the epoxide ring is expected as a result of the curing reaction 48–50 . In the infrared spectrum of the DGEBA_DETA, the band at 916 cm −1 is intense until 24 h at 25°C, and its intensity decreases after heating at 100°C (Figure 1); however, it is still noticeable.…”

Section: Resultsmentioning

confidence: 98%

“…In the epoxy-amine system, the reduction in the band intensity at 916 cm À1 assigned to the COC group of the epoxide ring is expected as a result of the curing reaction. [48][49][50] In the infrared spectrum of the DGEBA_DETA, the band at 916 cm À1 is intense until 24 h at 25 C, and its intensity decreases after heating at 100 C (Figure 1); however, it is still noticeable. Thus, to induce a whole curing reaction, the DGEBA_DETA and the epoxy nanocomposites were post-cured at 150 C for 1 h. After the post-curing, the band at 916 cm À1 in the DGEBA_DETA spectrum is no longer noticeable.…”

Section: Epoxy/organoclay Nanocomposite Curing Reactionmentioning

confidence: 99%

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The role of organoclay in the diffusion of epoxy‐amine oligomers and in the cross‐linking density of the resulting network

Baruel

Dutra

Diniz

et al. 2022

J of Applied Polymer Sci

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Epoxy nanocomposites are promising for adhesive applications due to their high performance. In this work, an organoclay (PO), prepared by cationic exchanging using a quaternary phosphonium salt or a silylated PO (SPO) was added to an epoxy‐amine resin‐based adhesive to reduce its dripping. PO and SPO were dispersed in the epoxy network on a nanometric scale, mainly in an intercalated structure. A liquid‐to‐gel transition occurs at 4–6 wt% PO due to forming a continuous organoclay network throughout the epoxy volume, eliminating its dripping. The PO addition accelerates the curing reaction initially, and cured nanocomposites with over 3 wt% PO show a drastic reduction in the glass transition temperature (Tg). Moreover, a broadening of the secondary relaxation observed by DMA indicates an interaction between the epoxide‐amine oligomers with the silicate surface. This interaction, associated with forming a continuous organoclay network at 4–6 wt% PO, reduces the epoxy‐amine oligomers diffusion, resulting in their partial curing and consequent Tg decreasing. EPOXY_SPO nanocomposites show Tg values similar to or higher than that observed for the epoxy‐amine network attributed to the forming of covalent bonds between the glycidyloxypropyl end groups in the SPO surface and the hardener amine.

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Section: Resultsmentioning

confidence: 98%

Section: Epoxy/organoclay Nanocomposite Curing Reactionmentioning

confidence: 99%

The role of organoclay in the diffusion of epoxy‐amine oligomers and in the cross‐linking density of the resulting network

Baruel

Dutra

Diniz

et al. 2022

J of Applied Polymer Sci

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“…These peaks prove that monomer 1 and monomer 2 were successfully bridged with PDMS. 30 The disappearance of the peaks at 1638 and 910 cm −1 in the ME-PDMS membrane indicates the curing of ME-PDMS.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…28 The proton signal of Si−O−CH 3 is located at 3.47 ppm, and the proton signal at 0.08 ppm is associated with Si−CH 3 . 30 The proton signal of −CH− of the epoxide group is at 3.11 ppm. 32 Furthermore, the proton signal of PDMS itself is mainly at 0.08 ppm.…”

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confidence: 99%

Photopolymerized Fabrication Method for PDMS Pervaporative Membranes

Li,

Yang,

Zhan

et al. 2023

Ind. Eng. Chem. Res.

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The polydimethylsiloxane (PDMS) membrane can be considered the benchmark of alcohol-selective membranes, and its preparation method by photopolymerization shows a great potential on the industrial scale. However, a single photopolymerization system by a free radical or cation is still a challenge to simultaneously have a high reaction speed and oxygen insensitivity. In this work, we proposed a free radical/cationic hybrid membrane-forming system toward PDMS. Both methacrylate groups and epoxy groups were introduced into the PDMS chain by the covalent bonding of 3-methacryloxypropylmethyldimethoxysilane and 3-glycidyloxypropyl(dimethoxy)methylsilane with PDMS. This hybrid system can be quickly cured by a free radical reaction which weakens the oxygen inhibition by a cationic reaction. Furthermore, the transport structure of membranes is effectively controlled by the difference in the reactivity between methacrylate and epoxy groups, where the formed molecular weight and viscosity of the prepolymer are changed from 62,860 to 108,198 g mol −1 and 1.53 to 2.26 Pa s, respectively, and the free volume of membranes is tuned from 5.567 to 6.253%. By optimization, the pervaporation performance of the membrane includes a 1-butanol separation factor of 37.9 and a total flux of 1179 g m −2 h −1 as evaluating 1.5 wt % 1-butanol/water solutions at 55 °C, which has a high superiority coupled with the fast reaction speed and oxygen insensitivity.

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“…For example, linear epoxy-functionalized and amine-functionalized polydimethylsiloxanes (PDMS) are frequently used to toughen epoxy thermosets, whose toughness-related properties were improved but whose mechanical properties decreased because of phase separation. [6][7][8] On the other hand, polysilsesquioxanes have special structures: for example, cage-like, ladder-like, and hyperbranched. Polysilsesquioxanes can be further functionalized by attaching a variety of functional organic groups, providing the resultant polymer nanocomposites with excellent properties.…”

Section: Introductionmentioning

confidence: 99%

Bio-based epoxy functionalized MQ silicone resins: from synthesis to toughened epoxy composites with good mechanical properties, thermal resistance and transparency

Zheng

Cai

et al. 2022

Polym. Chem.

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Viscoelastic behavior and toughness of the DGEBA epoxy resin with 1,2-diaminocyclohexane: effect of functionalized poly(dimethylsiloxane), diglycidyl ether, PDMS-DGE, pre-reacted with 1,2-diaminocyclohexane

Cited by 6 publications

References 58 publications

The role of organoclay in the diffusion of epoxy‐amine oligomers and in the cross‐linking density of the resulting network

The role of organoclay in the diffusion of epoxy‐amine oligomers and in the cross‐linking density of the resulting network

Photopolymerized Fabrication Method for PDMS Pervaporative Membranes

Bio-based epoxy functionalized MQ silicone resins: from synthesis to toughened epoxy composites with good mechanical properties, thermal resistance and transparency

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