Unsaturated Polyester for Large Castings

Abdel‐Azim, Abdel‐Azim A.; Nasr, E. S.; Farhat, M.

doi:10.1295/polymj.26.423

Cited by 18 publications

(6 citation statements)

References 11 publications

(7 reference statements)

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“…These high‐performance composites offer excellent chemical resistance, weather‐ability, high strength to weight ratio and ease of fabrication. UP can be synthesized for this purpose from virgin material65–68 or from recycled products of PET waste 69–76. UP synthesized from PET waste is also applied in making polymer concretes and polymer mortars77–84 and was more recently applied for synthesizing modified UP with improved curing thermal profiles85 and improved mechanical properties 86.…”

Section: Recycling Of Pet a Promising Endeavormentioning

confidence: 99%

New Motivation for the Depolymerization Products Derived from Poly(Ethylene Terephthalate) (PET) Waste: a Review

Nikles

Farahat

2005

Macro Materials & Eng

232

138

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Summary: Over the last several decades, the process of recycling polymer waste has been attracting the attention of many scientists working on this issue. Polymer recycling is very important for at least two main reasons: firstly, to reduce the ever increasing volumes of polymer waste coming from many sources: from daily life packaging materials and disposables and secondly, to generate value‐added materials from low cost sources by converting them into valuable materials similar, to some extent, to virgin materials. Poly(ethylene terephthalate) (PET) occupies the top of the list of polymers to be recycled due to its easy recycling by different ways, which, in accordance, give variable products that can be introduced as starting ingredients for the synthesis of many other polymers. PET can by recycled by hydrolysis, acidolysis, alkalolysis, aminolysis, alcoholysis and glycolysis. Glycolysis is the breakdown of the ester linkages by a glycol, resulting in oligomers or oligoester diols/polyols with hydroxyl terminal groups. Oligoesters coming from the glycolysis of PET waste have been well known for a number of decades to be utilized as a starting material in the manufacture of polyurethanes, unsaturated polyesters and saturated polyester plasticizers. But, as a current motivation, we are reporting on a new application for these oligoester diols/polyols by converting the hydroxyl terminals into acrylate/methacrylate groups. These new acrylated/methacrylated oligoesters have been tested as UV curable monomers and gave promising results from the point of view of their curability by UV and their mechanical properties. The new motivations open the potential for the market to apply the depolymerization products of PET waste for UV curable coatings, useful for wood surfaces, paints and other applications.Recycling of PET polymer by different chemical routes.magnified imageRecycling of PET polymer by different chemical routes.

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Section: Recycling Of Pet a Promising Endeavormentioning

confidence: 99%

New Motivation for the Depolymerization Products Derived from Poly(Ethylene Terephthalate) (PET) Waste: a Review

Nikles

Farahat

2005

Macro Materials & Eng

232

138

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“…This in turn is reflected in T max and t max . It is well known that, as the number of curable double bond along the unsaturated polyester chain increases, the curing reaction becomes more exothermic and proceeds faster [27,28]. Mita and Kambe studied structural effects of unsaturated polyester resins on their curing behavior [29].…”

Section: Determination Of the Curing Exothermsmentioning

confidence: 99%

Synthesis and characterization of some degradable polyesters

Raouf¹

2006

Materials Research Innovations

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Three series of biodegradable unsaturated polyesters containing hydroxybenzoic acid with different ratios and maleic anhydride as a site of unsaturation were synthesized in the presence of several aliphatic acids. Their chemical structures were confirmed via IR and 13 CNMR spectroscopy. Curing exotherms of the unsaturated polyesters with styrene so prepared were determined at several temperatures. Effects of hydroxybenzoic acid content and the percentage of maleic anhydride on the synthesis, structure, curing and mechanical properties and hydrolytic degradation are reported.

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“…So, the net result of this variation is an increase of the number of curable double bonds along the unsaturated polyester chains. It is well known [25][26][27][28][29][30] that the curing reaction gets faster and more exothermic with increasing double bond intensity per each unsaturated polyester chain. Horie et al [27] studied the effect of the chemical structure of unsaturated polyester resins on their curing behavior and reported that the final degree of curing under isothermal conditions increases remarkably with increasing amount of fumarate/maleate unsaturations per polyester chain.…”

Section: The Effect Of Ma Concentrationmentioning

confidence: 99%

“…This effect of the varying MA concentration on the curing behavior of unsaturated polyester resins is consistent with our data obtained previously on unsaturated polyesters synthesized from virgin materials. [29,30] The effect of PHBA concentration…”

Section: The Effect Of Ma Concentrationmentioning

confidence: 99%