Thermal Stability of Imidized Epoxy Blends Initiated by <i>N</i>-Benzylpyrazinium Hexafluoroantimonate Salt

A novel polyhedral oligomeric silsesquioxane (POSS) containing a mercaptopropyl group [mercaptopropyl polyhedral oligomeric silsesquioxane (MPOSS)] was synthesized via the hydrolytic condensation of g-mercaptopropyl triethoxysilane in an ethanol solution catalyzed by concentrated hydrochloric acid and was used to modify epoxyamine networks by a cocuring reaction with diglycidyl ether of bisphenol A (DGEBA). The structure, morphology, and thermal and mechanical properties of these MPOSS/DGEBA epoxy nanocomposites were studied and investigated with thermogravimetric analysis/differential thermal analysis (TGA-DTA), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). From SEM analysis, we observed that the miscibility between epoxy and POSS occurred at a relatively high POSS content, which characterized this mixture as a polymer nanocomposite system. The impact test showed that MPOSS reinforced the epoxy effectively, and the SEM study of the impact fracture surface showed that the fibrous yielding phenomenon observed was an indication of the transition of the brittle stage to a ductile stage and correlated well with the large increases in the impact strength; this was in agreement with the in situ reinforcing and toughening mechanism. The TGA-DTA analysis indicated that the MPOSS/DGEBA epoxy hybrids exhibited lower thermostability at a lower temperature but higher thermostability and higher efficiency in char formation at an elevated temperature. Differential scanning calorimetry showed that the glass transition temperature (T g ) of the MPOSS/epoxy hybrids were lower than that of the neat epoxy.

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“…43,44 In addition, temperatures obtained for mass losses of 10, 15, and 50 wt % (T 10 , T 15 , and T 50 , respectively) were also determined.…”

Section: Thermal Stabilitymentioning

confidence: 99%

Epoxy nanocomposites containing mercaptopropyl polyhedral oligomeric silsesquioxane: Morphology, thermal properties, and toughening mechanism

Shi

Chen

et al. 2008

J of Applied Polymer Sci

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“…Therefore, epoxy resins were cured with reactive polyimides 2-4 , polyamic acid 5 , and imido-modified curing agents 6 to introduce imide structure into epoxy resin. The thermal stability of the above mentioned imido epoxy resins was significantly leveled up both in the initial decomposition temperature (IDT) and the integral procedural decomposition temperature (IPDT) 7 . On the other hand, epoxy resins modified with maleimide compounds also received attractive attentions, due to the similar curing conditions and processing properties of the epoxy resins and maleimides.…”

Section: Introductionmentioning

confidence: 99%

Reactivity Studies of Maleimide Epoxy Resin With Long Chained Amines

Lakshmi

Shivananda

Mahendra

2011

J. Chil. Chem. Soc.

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After phenylmaleimido group was successfully incorporated into bisphenol-A type epoxy resins (B-13 ) to result in compound possessing both oxirane ring and maleimide reactive groups. The cured maleimide epoxy samples are obtained by thermally curing of the maleimide epoxy (MIE) compounds with aliphatic long chained amines such as Tetraethylenepentamine (TEPA), Bishexamethylenetriamine (BHMT), 2-methyl pentamethylenediamine (2-MPMDA) and 2,2,4-trimethy diamines (2,2,4-TMDA) exhibited excellent thermal stability and good chemical (acid/alkali/solvent) and water absorption resistance. Morphological studies by the SEM technique further confirmed the phase homogeneity net work of the cured systems.

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“…Generally, modifying epoxy resin with polyamides or imido compounds [3] provide a convenient approach of enhancing the thermal stability of epoxy resins. Therefore, epoxy resins were cured with reactive polyimides [4], polyamic acid [5], and imido-modified curing agents [6] to introduce imide structure into epoxy resin. The thermal stability of the above mentioned imido epoxy resins was significantly levelled up both in the initial decomposition temperature (IDT) and the integral procedural decomposition temperature (IPDT) [7].…”

Section: Introductionmentioning

confidence: 99%

<b>Preparation and reactivity studies of maleimidophenyl glycidylether with amines</b>

Lakshmi

Shivananda

Mahendra

2011

Bull. Chem. Soc. Eth.

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ABSTRACT ABSTRACT. The hybrid thermosetting maleimido epoxy compound 4-(N-maleimidophenyl) glycidylether (N-MPGE) was prepared by reacting N-(4-hydroxyphenyl) maleimide (HPM) with epichlorohydrin by using benzyltrimethylammonium chloride as a catalyst. The resulting compound possessed both the oxirane ring and maleimide group. The curing reaction of N-MPGE with amines as curing agents such as tetraethylenepentamine (TEPA), bishexamethylenetriamine (BHMT), 2-methyl pentamethylenediamine (2-MPMDA) and 2,2,4-trimethy diamines (2,2,4-TMDA) was studied. The cured samples exhibited good thermal stability and excellent chemical (acid/alkali/solvent) and water absorption resistance. Morphological studies by the SEM technique further confirmed the phase homogeneity network of the cured systems. KEY WORDS KEY WORDS KEY WORDS

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Thermal Stability of Imidized Epoxy Blends Initiated by N-Benzylpyrazinium Hexafluoroantimonate Salt

Cited by 96 publications

References 8 publications

Epoxy nanocomposites containing mercaptopropyl polyhedral oligomeric silsesquioxane: Morphology, thermal properties, and toughening mechanism

Epoxy nanocomposites containing mercaptopropyl polyhedral oligomeric silsesquioxane: Morphology, thermal properties, and toughening mechanism

Reactivity Studies of Maleimide Epoxy Resin With Long Chained Amines

<b>Preparation and reactivity studies of maleimidophenyl glycidylether with amines</b>

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