Synthesis and curing of new aromatic azomethine epoxies with alkoxy side groups

Choi, E‐Joon; Seo, Jung-Chul; Bae, Hong-Ki; Lee, Jong Keun

doi:10.1016/j.eurpolymj.2003.08.009

Cited by 31 publications

(16 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This may be associated with the lateral chains, which may act like a bound solvent and also facilitate the curing reaction. 26 The values of frequency factor (A) show the same tendency to E a but change much greater than E a as the side chain length increasing (Table III). This indicated that the curing reaction be- Figure 3.…”

Section: -21mentioning

confidence: 71%

Cure Kinetics and Mechanical Properties of Liquid Crystalline Epoxides with Long Lateral Substituents Cured with Anhydride

Liang

Ren

Zheng

et al. 2007

Polym J

View full text Add to dashboard Cite

ABSTRACT:A series of liquid crystalline (LC) epoxy monomers with different length of lateral substituents were cured with anhydrides. The cure kinetics was investigated by DSC technique. From a multi-temperature scan method, the activation energy E a and the frequency factor A were determined and compared for epoxides with different length of lateral substituents. The results showed that as the length of lateral substituent increases, the activation energy E a decreases, but the curing reaction of liquid crystalline epoxides become less active and is controlled by diffusion at the late stage of curing. The phase structures and the mechanical properties of the resulted LC epoxy resins were studied by POM, WAXD, DMA, tensile tests and SEM. A nematic structure is observed. And as the length of lateral substituent increases, the cross-linking densities and glass transition temperature (T g ) of the LC networks decreases. The tensile modulus, together with break strength and elongation at break also decreases as the side chain increasing.

show abstract

Section: -21mentioning

confidence: 71%

Cure Kinetics and Mechanical Properties of Liquid Crystalline Epoxides with Long Lateral Substituents Cured with Anhydride

Liang

Ren

Zheng

et al. 2007

Polym J

View full text Add to dashboard Cite

show abstract

“…In this article, two different methods, i.e., Ozawa and Kissinger, were chosen to analyze experimental results for the thermal degradation kinetics. Main advantages of these methods are simplicity and accuracy to estimate the activation energy ( E ) and frequency factor ( A ) . The activation energy can be determined by Kissinger and Ozawa methods without a precise knowledge of the reaction mechanism.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of polystyrene modified with fluorine atoms: Monomer reactivity ratios and thermal behavior

et al. 2013

View full text Add to dashboard Cite

Homo‐ and copolymers of 4‐fluorostyrene (FSt) and styrene (St) were synthesized with different feed ratios using free radical bulk polymerization with azobisisobutyronitrile (AIBN) as initiator. It yielded series of (co)polymers with various amounts of included FSt, P(St‐co‐FSt) (5–50 mol%) and PFSt. The effect of the initiator concentration on the molecular weights of the homopolymers, that is, PSt and PFSt was investigated. Copolymer compositions were determined by nuclear magnetic resonance spectroscopy. The relative reactivity ratios of both comonomers were determined by applying the conventional linearization methods of Jaacks (J), Finemann–Ross (F–R), inverted Finemann–Ross (IF–R), and Kelen‐Tüdos (K–T). The reactivity ratios values of St and FSt obtained from J plot are 1.06 and 0.84, F–R plot are 1.18 and 1.06, IF–R 1.01 and 0.86, and K–T plot 1.04 and 0.88, respectively. Thermal properties of prepared (co)polymers, that is, glass transition temperature (Tg) and thermal stability, were determined from differential scanning calorimetry and thermogravimetrical measurements. The lack of significant influence of FSt comonomer content on Tg of (co)polymers was observed. Additionally, the thermal degradation kinetics of obtained PSt and PFSt was studied by thermogravimetric analysis. Kinetic parameters such as the thermal decomposition activation energy (E) and frequency factor (A) were estimated by Ozawa model [E(O) and A(O), respectively] and Kissinger model [E(K) and A(K), respectively]. The activation energy and the frequency factor of PFSt (253 kJ/mol) were higher than PSt (236 kJ/mol). The resulting activation energies estimated using the two methods were quite close. POLYM. ENG. SCI., 54:1170–1181, 2014. © 2013 Society of Plastics Engineers

show abstract

“…Two different methods i.e., Ozawa and Kissinger were applied by us to analyze the experimental results for the imidization kinetics. The advantage of these methods includes simplicity and accuracy in estimating the activation energy (E) and frequency factor (A) [27,28]. The activation energy can be determined by Kissinger and Ozawa methods without a precise knowledge of the reaction mechanism.…”

Section: Tablementioning

confidence: 99%

“…According to the integral Ozawa method, the activation energy was determined from the DSC thermograms under different heating rates using Ozawa equation [28,30,31]:…”

Section: Tablementioning

confidence: 99%

Poly(amic acid)s and their poly(amide imide) counterparts containing azobenzene moieties: Characterization, imidization kinetics and photochromic properties

Konieczkowska

Janeczek

Kozanecka-Szmigiel

et al. 2016

Materials Chemistry and Physics

View full text Add to dashboard Cite

Synthesis and curing of new aromatic azomethine epoxies with alkoxy side groups

Cited by 31 publications

References 26 publications

Cure Kinetics and Mechanical Properties of Liquid Crystalline Epoxides with Long Lateral Substituents Cured with Anhydride

Cure Kinetics and Mechanical Properties of Liquid Crystalline Epoxides with Long Lateral Substituents Cured with Anhydride

Synthesis of polystyrene modified with fluorine atoms: Monomer reactivity ratios and thermal behavior

Poly(amic acid)s and their poly(amide imide) counterparts containing azobenzene moieties: Characterization, imidization kinetics and photochromic properties

Contact Info

Product

Resources

About