Curing kinetics and properties of epoxy resin–fluorenyl diamine systems

Liu, Wenbin; Qiu, Qihao; Wang, Jun; Huo, Zichun; Sun, He

doi:10.1016/j.polymer.2008.08.004

Cited by 133 publications

(107 citation statements)

References 44 publications

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“…The appropriate tool to study the problem is the thermal analysis, in particular the conventional or temperaturemodulated differential scanning calorimetry (DSC). The DSC study can be carried out in a dynamic [9,[31][32][33][34][35][36][37][38] or isothermal mode [22,[39][40][41].…”

Section: Introductionmentioning

confidence: 99%

A quantitative approach to dynamic and isothermal curing of an epoxy resin modified with oligomeric siloxanes

Murias

Byczyński

Maciejewski

et al. 2015

J Therm Anal Calorim

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The reactivity of a system comprising commercial epoxy resin Epidian Ò 6 (E6) and triethylenetetramine (Z-1) hardener was studied. The system was modified with two low-molecular siloxane modifiers: 1,3-bis(glycidyloxypropyl)-1,1,3,3-tetramethyldisiloxane (DS1) and 1,3-bis(aminopropyl)-1,1,3,3-tetramethyldisiloxane (DS2). The modifiers replaced 10 mass% of E6 or Z-1, respectively. The systems E6/DS2 and DS1/Z-1 were also studied. Enthalpy of curing was determined for all systems in isothermal conditions and dynamically, i.e., in the range of 0-250°C with linearly increasing temperature at the rate of 2, 5, 10, and 20°C min -1 . The activation energy of curing was determined using isoconversional methods by Friedman and Kissinger-Akahira-Sunose. The epoxy systems containing siloxane modifiers had generally lower activation energies than the reference E6/Z-1 system. The time to gelation measurements were taken using the temperaturemodulated differential scanning calorimetry.

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Section: Introductionmentioning

confidence: 99%

A quantitative approach to dynamic and isothermal curing of an epoxy resin modified with oligomeric siloxanes

Murias

Byczyński

Maciejewski

et al. 2015

J Therm Anal Calorim

View full text Add to dashboard Cite

show abstract

“…Therefore, elucidation of the reaction mechanism of epoxy curing still attracts great interest for both fundamental and applied chemistry areas. Meanwhile, in the curing reaction of epoxy resins, amino resins are widely used as hardeners but the curing mechanism is still not completely revealed [4][5][6]. Yong Lv et al [7] studied the curing kinetics of a diglycidyl ether of bisphenol A with a methanol etherified amino resin, but they did not discuss the origin of proton, which is important to methanol etherified amino resin.…”

Section: Introductionmentioning

confidence: 99%

Curing kinetics, mechanism and chemorheological behavior of methanol etherified amino/novolac epoxy systems

Zhao¹,

Zhang²,

Sun³

et al. 2014

Express Polym. Lett.

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Abstract. The curing kinetics and mechanism of epoxy novolac resin (DEN) and modified epoxy novolac resin (MDEN) with methanol etherified amino resin were studied by means of differential scanning calorimetry (DSC), Fourier transforminfrared (FT-IR) spectroscopy and chemorheological analysis. Their kinetics parameters and models of the curing were examined utilizing isoconversional methods, Flynn-Wall-Ozawa and Friedman methods. For the DEN mixture, its average activation energy (E a ) was 71.05 kJ/mol and the autocatalytic model was established to describe the curing reaction. The MDEN mixture exhibited three dominant curing processes, termed as reaction 1, reaction 2 and reaction 3; and their E a were 70.05, 106.55 and 101.91 kJ/mol, respectively. Besides, E a of reaction 1 was similar to that of DEN mixture, while E a of reactions 2 and 3 corresponded to that of the etherification reaction between hydroxyl and epoxide group. Moreover, these three dominant reactions were n th order in nature. Furthermore, their curing mechanisms were proposed from the results of DSC and FTIR. The chemorheological behavior was also investigated to obtain better plastics products via optimizing the processing schedules.

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“…There are two active functional groups (primary NH 2 groups) in organic diamine, which can be enabled to react with many other compounds to give out different derivatives. For example, they can react with epoxy resin to supply of polymer in higher performance [1][2][3][4][5][6][7][8] , as well as with aldehyde, acyl chloride and anhydride to give out schiff base, amide and amic acid, respectively [9][10][11] . At the same time, they can also complex with metal ions and be used as catalyst in many reactions, such as Henry reaction, Machel addition reaction, aldol reaction and asymmetric oxidative coupling reaction [12,13] .…”

Section: Introductionmentioning

confidence: 99%