Effect of polyester backbone structure on the cured products properties

Tawfik, S. Y.; Asaad, J. N.; Sabaa, Magdy W.

doi:10.1016/s0142-9418(03)00008-4

Cited by 27 publications

(11 citation statements)

References 5 publications

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“…One possible reason to explain this result could be the difference in crosslink densities, as the number of unsaturated bonds was higher in PCLF530 than PCLI530. Another reason may be due to the fact that the double bonds of the fumaric acid present in the backbone structure were more susceptible to self‐crosslinking or crosslinking with NVP than the double bonds of itaconic acid present in the backbone structure under the studied condition 32. By increasing the thickness of the infiltrating solution, the compressive strength increased about 128 and 22% in samples infiltrated with PCLF530 and PCLI530, respectively.…”

Section: Resultsmentioning

confidence: 99%

Hydroxyapatite scaffolds infiltrated with thermally crosslinked polycaprolactone fumarate and polycaprolactone itaconate

Sharifi

Shafieyan

Mirzadeh

et al. 2011

J Biomedical Materials Res

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In this work, two unsaturated derivatives of polycaprolactone (PCL), polycaprolactone fumarate (PCLF), and polycaprolactone itaconate (PCLI), have been synthesized and used as an infiltrating polymer to improve the mechanical properties of brittle hydroxyapatite (HA) scaffolds. PCLF and PCLI were first synthesized through polyesterification of the low molecular weight PCL diols with fumaryl chloride and itaconyl chloride respectively, and then characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, gel permeation chromatography, and differential scanning calorimetry analysis. HA scaffolds were sintered using a foam replication technique, with porosity of about 60%. Polymer-HA composites were obtained by infiltrating the HA scaffolds with PCLF and PCLI solution (12.5 and 30 w/v in dichloromethane) followed by thermal crosslinking. The polymer infiltrated HA scaffolds were characterized by scanning electron microscopy, porosimetry, and gravimetrical analysis. The polyesterification reaction of PCL diols with fumarate chloride was more efficient than itaconyl chloride and dependent upon the molecular weight of the initial PCL precursor; the resultant PCLF demonstrated a degree of substitution of 1.2, 4.2, and 2.7 times higher than PCLIs. Polymer infiltration improved the compressive strength of the HA scaffolds, and based upon the type of macromer (PCLF or PCLI) and also their concentration in infiltrating solution (12.5 or 30 w/v %) compressive strength increased about 14-328%. In all studied samples, the reinforcement effect of PCLF infiltration was higher than PCLI. The macromers and their corresponding infiltrated HA scaffolds did not show any significant cytotoxicity toward human primary osteogenic sarcoma cell (G92 cell lines), in vitro.

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Section: Resultsmentioning

confidence: 99%

Hydroxyapatite scaffolds infiltrated with thermally crosslinked polycaprolactone fumarate and polycaprolactone itaconate

Sharifi

Shafieyan

Mirzadeh

et al. 2011

J Biomedical Materials Res

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“…The unsaturated polyester resins based on the reaction of maleic anhydride (0.5 mole), phthalic anhydride (0.25 mole), and sebasic acid (0.25 mole) with each of 1,6‐hexanediol (PE L , 1.05 mole) and with 1,4‐cyclohexanediol (PE C ) were prepared by melt condensation method 12…”

Section: Methodsmentioning

confidence: 99%

Effect of glycol and filler types on some polymeric composite properties

Asaad

Abd‐El‐Messieh

2008

J of Applied Polymer Sci

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Two unsaturated polyesters based on maleic anhydride, phthalic anhydride, and sebasic acid with each of linear 1,6-hexanediol (PE L ) and cyclic 1,4-cyclohexanediol (PE C ) were prepared. Their structures were characterized by IR and 1 H NMR spectra. Their composites were prepared by mixing different ratios (60, 70, and 80%) with talc and kaolin with polyester/styrene mixture. The effect of linear and cyclic glycols and the effect of filler type and concentration of these composites were studied in terms of their electrical properties and the hardness before and after aging. The thermal behavior of styrenated polyesters and their composites was studied using thermogravimetric analysis. It has been found that both fillers increase the thermal stability and decrease the weight loss. The permittivity e 0 and the dielectric loss e 00 were measured in the frequency range 100 Hz up to 100 kHz at room temperature 258C 6 1. The polyester composite samples containing 70% filler lead to good electrical properties in addition to its resistance to thermal aging. The hardness value was increased by increasing the filler content before and after aging. The polyester composites based on cyclic glycol and loaded with 80% kaolin gave the highest hardness values.

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“…The curing of this polyester backbone by the unsaturated acid constituent in combination with a vinyl component creates a three-dimensional structure [3]. Inorganic particulates as fillers are widely used in polymer compounds to improve physical properties and to reduce the final cost.…”

Section: Introductionmentioning

confidence: 99%