Relationships between the morphology, swelling and mechanical properties of poly(dimethyl siloxane)/poly(acrylic acid) interpenetrating networks

Jalili, Kiyumars; Abbasi, Farhang; Oskoee, Siavash Savadi; Alinejad, Z.

doi:10.1016/j.jmbbm.2009.01.002

Cited by 7 publications

(6 citation statements)

References 21 publications

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“…Las estructuras contienen dominios de fase de polimetilmetacrilato sobre una fase continua de poliuretano. Puesto que la densidad de entrecruzamiento de la red de poliuretano se mantuvo constante, el factor que controla el tamaño de los dominios de fase fue la composición PU/PMMA y su compatibilidad termodinámica [18] . Se observa que a medida que se incrementa la composición de polimetilmetacrilato el tamaño de los dominios de las fases se incrementa, lo cual indica que al aumentar la concentración de polimetilmetacrilato disminuye la compatibilidad entre las redes (la fase de polimetilmetacrilato aparece menos dispersa dentro de la matriz de poliuretano al incrementar la cantidad de PMMA).…”

Section: Microscopia Electrónica De Barrido (Sem)unclassified

[No Title Available]

et al. 2011

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Resumen: El aceite de ricino se modificó por transesterificación con pentaeritritol. Paralelamente, se utilizó la reacción de glucosilación con glicerol para dividir el almidón en unidades monosacáridos. El glucósido obtenido reaccionó por transesterificación con el aceite modificado por transesterificación con pentaeritritol. Se determinó el índice de hidroxilo de los poliol-glucósidos en función del contenido de pentaeritritol y almidón utilizados en la síntesis. Se sintetizaron redes interpenetradas de polímero de manera simultánea (SINs) con diferentes relaciones en peso poliuretano/PMMA de 100/0, 90/10, 80/20, 70/30, 60/40 y 50/50. Para la síntesis de la red de poliuretano (PU) se utilizaron los poliol-glucósidos y diisocianato de isoforona (IPDI) o con una relación NCO/OH = 1 y para la síntesis de la red de polimetilmetacrilato (PMMA) se utilizó peróxido de benzoílo como agente iniciador y dimetacrilato de etilenglicol como agente entrecruzante. Los SINs se caracterizaron por sus propiedades fisicomecánicas como resistencia al ataque químico, dureza, resistencia a la tensión y elongación de ruptura. La estabilidad térmica de los SINs se determinó usando análisis termogravimétrico (TGA). La morfología de superficie se determinó usando microscopia electrónica de barrido (SEM) y mostró una morfología de dos fases para todos los SINs. Palabras-clave: Aceite de ricino, almidón, glucosilación, redes interpenetradas de polímero, polimetilmetacrilato (PMMA). Physico-mechanical, Thermal and Morphological Behaviour of Simultaneous Interpenetrating Polymer Networks Based on Polyurethane from Modified Castor Oiland Starch/Poly(Methyl Methacrylate)Abstract: Castor oil was modified by transesterification with pentaerithritol. In a parallel step, starch was divided into monosaccharide units by glycosylation in order to obtain products with high hydroxyl content. The values of hydroxyl index were measured according to the content of pentaerithritol and starch used in the synthesis. Novel simultaneous interpenetrating polymer networks (SINs) of polyurethane (PU) and poly(methyl methacrylate) (PMMA) in different weight ratios of 100/0, 90/10, 80/20, 70/30, 60/40 and 50/50 were prepared based on polyol-glucosides. The polyurethane network was created by reacting the poliol-glucosides with isophorone diisocyanate maintaining a molar ratio NCO/OH = 1. The PMMA network was synthesized using benzoyl peroxide as initiator and ethylene glycol dimethacrylate as the crosslinker. The SINs were characterized in their mechanical properties, such as Shore A hardness, tensile strength and elongation at break. Thermal stability of SINs was measured using thermogravimetric analysis (TGA). Surface morphology measured using scanning electron microscope (SEM) showed two-phase morphology for all the SINs. SINs based on polyurethane from castor oil modified and poly(methyl methacrylate) show limited compatibility at low concentrations of PMMA, but are totally incompatible at higher concentrations of PMMA.

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Section: Microscopia Electrónica De Barrido (Sem)unclassified

[No Title Available]

et al. 2011

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“…However, the kinetics of the reaction of the formation of the second linear or cross‐linked polymers in first networks is so less investigated 36–38. Sequential full IPNs of poly(2‐hydroxyethyl methacrylate) (PHEMA) or PAAc/PDMS have been widely investigated by Abbasi et al, especially in terms of their biomedical applications 8, 39–42. This work involves the investigation of the effects of monomer concentration on cyclization, a novel multi‐step polymerization method, and the subsequent swelling behavior of the IPNs.…”

Section: Introductionmentioning

confidence: 99%

Silicone‐based hydrogels prepared by interpenetrating polymer network synthesis: Swelling properties and confinements effects on the formation kinetics

Alizadeh

Abbasi

Farahi

et al. 2011

J of Applied Polymer Sci

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In this work, interpenetrating polymer networks (IPNs) of polydimethylsiloxane (PDMS) and poly(acrylic acid) or poly(2‐hydroxyethyl methacrylate) (PHEMA) have been synthesized employing a sequential method. Monomeric AAc or HEMA was introduced into the PDMS network by swelling the polymer in solutions of monomer. The polymerization of monomers was then conducted in the swollen network. The swelling properties of the IPNs were investigated by varying the monomer concentrations in the polymerization and more swelling was observed with low monomer concentrations due to the prevalence of cyclization reactions. Multi‐step polymerization used to achieve IPNs with high hydrogel contents, did not improve their water uptake. The kinetics of acrylic acid polymerization was studied under various conditions. Specifically, in the presence of confinement effects imposed by the PDMS network a considerable drop in the rate of reaction was observed. The cross‐linking density of the PDMS network was also studied how to affect the reaction rate. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

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“…Their observations are explained in Figure 6, with visible morphological changes in scanning electron microscope (SEM) results, and with changes in swelling properties. 45 Figure 6 shows the variation of swelling with time for the IPNs with different PAA concentrations. This plot exhibits two distinct slopes, with a higher slope at concentrations of PAA greater than 25%.…”

Section: Reviewmentioning

confidence: 99%

“…Jalili et al also observed that in the case of IPNs in the solid state, phase inversion occurred at PAA concentrations of about 60 wt %, but in the swollen state, PAA acted together with the absorbed water as a single phase. 45 …”

Section: Reviewmentioning

confidence: 99%

“…SEM micrographs obtained from cross-sections of (a) (magnification 37000) unmodified PDMS, and PDMS/PAA IPNs having a PAA contents of (b) (magnification 37000) 20 wt %, (c) (magnification 33000) 20 wt %, (d) (magnification 37000) 30 wt %, (e) (magnification 37000) 40 wt %, (f) (magnification 37000) 50 wt %, (g) (magnification 37000) 60 wt %, and (h) swelling behavior of PDMS/PAA IPNs. 45 …”

Section: Effect Of Fillersmentioning

confidence: 99%

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Water swellable rubber composites: An update review from preparation to properties

Dehbari

Tang

2015

J of Applied Polymer Sci

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In recent years, water swellable rubber composites have been the subject of many scientific and research investigations as well as many industrial programs. Here, we present an updated overview of the developments in the area of water swellable rubber composites with different kinds of fillers, compatibilizers, and cross-linked agents, in terms of their manufacturing methods, synthesis, chemical, physical, and mechanical properties. Several critical issues and suggestions for future work are detailed, underscoring the roles of material scientists and manufacturing engineers in the bright future of this new material through value addition to enhance its usage and fields of application.

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Relationships between the morphology, swelling and mechanical properties of poly(dimethyl siloxane)/poly(acrylic acid) interpenetrating networks

Cited by 7 publications

References 21 publications

[No Title Available]

[No Title Available]

Silicone‐based hydrogels prepared by interpenetrating polymer network synthesis: Swelling properties and confinements effects on the formation kinetics

Water swellable rubber composites: An update review from preparation to properties

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