Reaction-induced phase separation in poly(butylene terephthalate)-epoxy systems: 2. Morphologies generated and resulting properties

Oyanguren, Patricia Angelica; Frontini, Patricia María; Williams, Roberto J. J.; Vigier, G.; Pascault, J. P.

doi:10.1016/0032-3861(96)89408-0

Cited by 50 publications

(37 citation statements)

References 6 publications

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“…The scatter obtained in the measurements of the Young's modulus of the epoxy resin and the blends with a 5 and 10% of thermoplastic content was so high that the moderate increase observed in the average value of the blend with 20% is not reliable. The value of the Young's modulus of the epoxy resin is in agreement with the flexural values reported by previous researchers,15, 23–25 and the tensile module reported by Grillet et al26 Even so, the tendency of the Young's modulus with the PS‐ co ‐PA content obtained from the tensile tests differs with that measured via DMTA experiments in this very system by Prolongo et al20 There, the storage modulus in the glassy state increased from 2.55 GPa for the pure epoxy resin to 2.75 GPa for the blends with 20 wt % of PS‐ co ‐PA. The discrepancy in the values obtained by these two methods is due to the inherent difficulty of measuring the Young's modulus.…”

Section: Resultssupporting

confidence: 91%

Fracture properties of epoxy/poly(styrene‐co‐allylalcohol) blends

Salazar

Prolongo

Rodrı́guez

2007

J of Applied Polymer Sci

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ABSTRACT:The epoxy/polystyrene system is characterized by a poor adhesion between the constituent phases, which determines its mechanical properties. The adhesion can be improved via blends based on epoxy resin and random copolymers, poly(styrene-co-allylalcohol) (PS-co-PA). In this work, the influence of PS-co-PA content and the good adhesion between the phases on the tensile properties and the fracture toughness achieved through instrumented Charpy tests have been investigated. The tensile strength and the deformation at break showed an increase in the PS-co-PA content while the Young's modulus remained the same. The tensile fracture surfaces revealed that the improvement of these magnitudes was mainly due to a crack deflection mechanism. Also, the fracture toughness of the blends was superior to that of the pure epoxy resin. The main operating toughening mechanism was crack deflection. The fractographic analysis showed that $ 80% of the particles were broken, and the crack tended to divert from its original path through the broken PS-co-PA particles. The remaining particles were detached from the epoxy resin, and the holes left suffered plastic deformation. Analytical models were used to predict successfully the toughness due to these mechanisms.

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Section: Resultssupporting

confidence: 91%

Fracture properties of epoxy/poly(styrene‐co‐allylalcohol) blends

Salazar

Prolongo

Rodrı́guez

2007

J of Applied Polymer Sci

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“…The use of engineering thermoplastic polymers [1][2][3][4][5] to enhance and balance the mechanical properties of epoxy resins has been investigated as an alternative to liquid rubber toughening [6] since the 1980s. The application of engineering thermoplastics like polyether ether ketone (PEEK) [1], polyether sulphone (PES) [2], polyether imide (PEI) [3,4], and polybutylene terephatlate (PBT) [5] can enhance the toughness of epoxies with less marked reduction of their other properties.…”

Section: Introductionmentioning

confidence: 99%

“…The application of engineering thermoplastics like polyether ether ketone (PEEK) [1], polyether sulphone (PES) [2], polyether imide (PEI) [3,4], and polybutylene terephatlate (PBT) [5] can enhance the toughness of epoxies with less marked reduction of their other properties. The primary shortcoming is the increase in viscosity that limits the content of the modifier.…”

Section: Introductionmentioning

confidence: 99%

Epoxy/PCL nanocomposites: Effect of layered silicate on structure and behavior

Rotrekl¹,

Matějka²,

Kaprálková³

et al. 2012

Express Polym. Lett.

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Abstract. The effect of clay-induced morphological transitions on the structure formed in the course of reactively induced phase separation (RIPS) and its impact on the properties of epoxy/polycaprolactone (PCL) nanocomposites were studied. The effect of organophilized montmorillonite on the behavior of epoxy containing 5-30% PCL was strongly dependent on the epoxy/PCL system composition. With a supercritical 20% PCL content, the increasing amounts of clay led to changes in the morphology that produced phase inversion, causing radical changes in the mechanical behavior. The main effect of the clay, which was located preferentially in the epoxy, was to influence the significant dynamic asymmetry (and thus the phase behavior). The simultaneous pinning effect of the clay on the phase separation changed the composition and parameters of the coexisting phases. The evaluation of the structure-properties relationship indicated the significant potential for nanoclays to control the behavior of thermoplastic-modified epoxy systems.

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“…[4] Epoxies constitute one of the most important classes of thermosetting resins in use. They have been mixed with a great variety of thermoplastics, including some semicrystalline polymers, such as poly(methylene oxide) (POM), [5] poly(butylene terephthalate) (PBT), [6,7] and mostly, with POE. [8 -11] The influence of the curing agent on the miscibility and on the crystalline morphology was Full Paper: Blends of diglicidyl ether of bisphenol-A, DGEBA, and poly(e-caprolactone), PCL, were cured with 4,49-diaminodiphenyl sulfone, DDS, and analyzed by differential scanning calorimetry, DSC, in order to study the effect of curing on the miscibility and crystallization behavior of the crystallizable component.…”

Section: Introductionmentioning

confidence: 99%