Study of step‐growth polymerizations using epoxy‐carboxy reaction, 4. Study of the epoxy‐carboxy reaction carried out in the melt on high molecular weight models

Madec, Pierre‐Jean; Maréchal, Ernest

doi:10.1002/macp.1983.021840212

Cited by 24 publications

(5 citation statements)

References 4 publications

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“…A solvent extraction method was used to separate PS- g -PBT copolymers from blend constituents of PBT and PS. The specimen prepared by either SOM or MB was dissolved into a mixed solvent of phenol and OCB (50/50 v/v) at 50 °C for 2 h. Madec and Marechal reported that the noncatalyzed reaction rate constant, k , of octadecanoic acid and 1-dodecyloxy-2,3-epoxy propane in OCB at 121 °C is 4.2 × 10 -6 kg mol -1 s -1 . Therefore, very little, if any, reaction occurred between the unreacted PBT and PS-GMA in phenol/OCB at 50 °C.…”

Section: Methodsmentioning

confidence: 99%

The Effect of the Amount of in Situ Formed Copolymers on the Final Morphology of Reactive Polymer Blends with an In Situ Compatibilizer

Jeon

Kim

1998

Macromolecules

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The effect of the amount of in situ formed graft copolymers on the blend morphology was investigated for immiscible polymer blends of poly(butylene terephthalate) (PBT) and polystyrene (PS) having various amounts of poly(styrene-ran-glycidyl methacrylate) (PS-GMA) as an in situ compatibilizer. Two different blending methods were used to prepare the blends: a melt blending (MB) and a solution blending followed by an oscillatory shearing at a molten state (SOM). The molecular weight of in situ PS-g-PBT copolymers formed from the reaction between PS-GMA and PBT in the blend was determined by using high-temperature gel permeation chromatography (GPC). The concentration of in situ formed graft copolymers of PS-g-PBT in the blends [C copolymer (blend)] prepared by either MB or SOM was determined by solvent extraction followed by Fourier transform infrared spectroscopy (FTIR) analysis. On the basis of the GPC and FTIR results, we concluded that the PS-g-PBT in the blends has 1.3−2 PBT chains grafted onto a PS-GMA chain. From FTIR analysis and the morphology of the blends investigated by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), we found that the interfacial areal density (Σ) of in situ formed PS-g-PBT is ∼0.1 chains/nm2 for the blends prepared by SOM regardless of the amounts of PS-GMA added initially in the blend. However, although C copolymer (blend) in the blend prepared by MB was similar to that prepared by SOM, the dispersed domain size of the former was larger than that of the latter, especially for blends with a large amount of PS-GMA (20 wt %). This suggests that at least some parts of in situ graft copolymers in the blend prepared by MB are located in the matrix phase as micelles with sizes of 20−50 μm.

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Section: Methodsmentioning

confidence: 99%

The Effect of the Amount of in Situ Formed Copolymers on the Final Morphology of Reactive Polymer Blends with an In Situ Compatibilizer

Jeon

Kim

1998

Macromolecules

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“…28 Based on previous studies, [29][30][31][32] the possible interactions between ELO, DCAs and DMAP are proposed as shown in Scheme 1. 28 Based on previous studies, [29][30][31][32] the possible interactions between ELO, DCAs and DMAP are proposed as shown in Scheme 1.…”

Section: Ft-ir Analysismentioning

confidence: 99%

New insights into the curing of epoxidized linseed oil with dicarboxylic acids

et al. 2015

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The effect of systematically increasing chain length of a series of linear α, ω-dicarboxylic acids (DCAs) from C6 to C18 diacids and a cyclic diacid, Pripol 1009F, on thermal and mechanical properties of the resultant epoxy thermosets derived from epoxidized linseed oil (ELO) are reported. Different techniques including differential scanning calorimetry (DSC), solvent extraction, FT-IR, NMR, dynamic mechanical analysis (DMA), tensile tests and thermogravimetric analysis (TGA) are used in this study. The results indicated that the obtained epoxy resins were highly crosslinked polymers with only a small fraction of low molecular weight soluble materials. The glass transition temperature (Tg), tensile strength, Young's modulus, elongation at break and toughness decreased while the thermal stability increased with respect to increasing chain length of DCAs. Interestingly, strain hardening was only observed for adipic acid (C6) sample for which the best mechanical properties observed.A systematic study of the synthesis and characterization of epoxy thermosets derived from ELO cured with different DCAs in the presence of DMAP at 160 o C for 1 h.

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“…Several alternative synthetic strategies such as creation of the molecular asymmetry by incorporating of noncoplanar groups in the main chain, attaching the bulky pendant groups, for instance, the introduction of substituents (alkyl or alkoxy groups) in the ortho-position of the aromatic ring or insertion of aliphatic flexible spacers between aromatic rings within the main chain are approached. 18 Siloxane moiety had also inserted as a flexible spacer, either in the amine or carbonyl component, resulting in polyazomethines with improved solubility [19][20][21][22][23][24][25] because of high flexibility of the siloxane bond and weak intermolecular interactions between dimethylsiloxane units. 4,17 The inclusion of polyazomethines in rotaxane architecture is another strategy approached to improve their processability.…”

Section: Introductionmentioning

confidence: 99%

“…4,17 The inclusion of polyazomethines in rotaxane architecture is another strategy approached to improve their processability. 18 Siloxane moiety had also inserted as a flexible spacer, either in the amine or carbonyl component, resulting in polyazomethines with improved solubility [19][20][21][22][23][24][25] because of high flexibility of the siloxane bond and weak intermolecular interactions between dimethylsiloxane units.…”

Section: Introductionmentioning

confidence: 99%

Neural network modeling of the preparation process of a siloxane‐organic polyazomethine

Macsim

Drăgoi

Cazacu³

et al. 2015

J of Applied Polymer Sci

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Although apparently simple, the polycondensation reaction leading to polyazomethine is difficult to control because of its equilibrium character, the conversion degree being influenced by a series of parameters. The reaction between a siloxanediamine, 1,3bis(3-aminopropyl)tetramethyldisiloxane, and terephthalaldehyde was performed here in solution (in tetrahydrofuran) without byproducts removal and in absence of any catalyst or pH modifier. Different conditions (co-monomers ratio, dilution, and temperature), considered as input parameters for the process modeling, were varied according to a pre-established experimental program. The viscosity of the reaction mixture was chosen as output parameter, being monitored with a Haake Viscotester 7 Plus-L. The process modeling was performed using a hybrid combination of artificial neural networks and differential evolution algorithm, the last one having the role of developing the neural model in an optimal form. The simulation results showed that the methodology provides accurate results, the model predictions being in close correlation with the experimental data.

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Study of step‐growth polymerizations using epoxy‐carboxy reaction, 4. Study of the epoxy‐carboxy reaction carried out in the melt on high molecular weight models

Cited by 24 publications

References 4 publications

The Effect of the Amount of in Situ Formed Copolymers on the Final Morphology of Reactive Polymer Blends with an In Situ Compatibilizer

The Effect of the Amount of in Situ Formed Copolymers on the Final Morphology of Reactive Polymer Blends with an In Situ Compatibilizer

New insights into the curing of epoxidized linseed oil with dicarboxylic acids

Neural network modeling of the preparation process of a siloxane‐organic polyazomethine

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