Unsaturated polyesters based on bis(2-hydroxyethyl)terephthalate

Tong, S. N.; Chen, D.S; Chen, C.C; Chung, Li‐Ching

doi:10.1016/0032-3861(83)90036-8

Cited by 37 publications

(20 citation statements)

References 4 publications

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“…The present study is intended to prepare UP and vinyl ester resins from recycled PET waste to use in coating applications. Tong et al 13 found that unsaturated polyesters based on bis(2-hydroxyethyl)terephthalate, maleic anhydride, and ethylene glycol were not compatible with styrene monomer. It was found that the replacement of the ethylene glycol by another type of glycol enhances the compatibility of the products with styrene monomer.…”

Section: Resultsmentioning

confidence: 98%

Mechanical characterization and chemical resistances of cured unsaturated polyester resins modified with vinyl ester resins based on recycled poly(ethylene terephthalate)

Atta

Abdel-Raouf

Elsaeed

et al. 2006

J of Applied Polymer Sci

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Unsaturated polyester resin (UP) was prepared from glycolyzed oligomer of poly(ethylene terephthalate) (PET) waste based on diethylene glycol (DEG). New diacrylate and dimethacrylate vinyl ester resins prepared from glycolysis of PET with tetraethylene glycol were blended with UP to study the mechanical characteristics of the cured UP. The vinyl ester resins were used as crosslinking agents for unsaturated polyester resin diluted with styrene, using free-radical initiator and accelerator. The mechanical properties of the cured UP resins were evaluated. The compressive properties of the cured UP/ styrene resins in the presence of different vinyl ester concentrations were evaluated. Increasing the vinyl ester content led to a pronounced improvement in the compression strength. The chemical resistances of the cured resins were evaluated through hot water, solvents, acid, and alkali resistance measurements.

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Section: Resultsmentioning

confidence: 98%

Mechanical characterization and chemical resistances of cured unsaturated polyester resins modified with vinyl ester resins based on recycled poly(ethylene terephthalate)

Atta

Abdel-Raouf

Elsaeed

et al. 2006

J of Applied Polymer Sci

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“…[24] Molecular weight determination Molecular weights of all synthesized unsaturated polyester resins (UP1-UP12) are determined by end-group analysis. [12] Each UP is analyzed for both acid number (A) and hydroxyl value (B) in mg KOH/g, and the numberaverage molecular weight M -n is then calculated from Eq.…”

Section: Resultsmentioning

confidence: 99%

“…Glycolysis reaction was carried out in a continuously stirred three-necked flask equipped with a condenser. The temperature of the reaction was kept constant at 200 -220 8C for a time of 4 h. [12][13][14][15][16] After completion of the glycolysis reaction, the product is cooled to room temperature, dissolved in a suitable amount of non-polar organic solvent, e. g., CH 2 Cl 2 , CCl 4 or benzene, and shaken vigorously with an equal amount of distilled water in order to get rid of unreacted glycol and remaining catalyst. [17] After phase separation between the two layers, the organic layer (oligomer dissolved in non-polar solvent) is collected and washed several times with distilled water by the same way.…”

Section: Experimental Partmentioning

confidence: 99%

Modified unsaturated polyester resins synthesized from poly(ethylene terephthalate) waste, 1. Synthesis and curing characteristics

Farahat¹,

Abdel‐Azim

Abdel-Raowf

2000

Macromol. Mater. Eng.

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“…The inside surfaces of the plate glass were polished with a releasing agent before assembly. The catalyzed unsaturated polyester was heated at 80 …”

Section: Toughened Resin Via Blending Method the Resins Were Preparementioning

confidence: 99%

Toughened Unsaturated Polyester Block Copolymers

Tong

Chen

1989

Advances in Chemistry

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Block copolymers of unsaturated polyester were prepared by cocondensation polymerization of hydroxyl-or carboxyl-terminated liquid rubbers or polyethylene glycols in the presence of maleic anhydride, phthalic anhydride, and propylene glycol. The resultant unsaturated polyesters were then diluted with styrene monomer and cured by using peroxide and heat. The mechanical properties of the cured block copolymers were determined and compared with those of a control resin or a corresponding toughened physical blend. In addition, the sheet-molding compounds made with these polyesters were obtained and investigated. (1-3). Chemical mod ifications by introducing either long-chain glycols (e.g., diethylene, dipropylene, or triethylene glycol) or long-chain saturated dibasic acids (e.g., adipic acid or sebacic acid) are common practice. However, a significant amount of such long-chain substances is needed to impart a sufficient im provement in toughness. This requirement, in turn, results in a large sacrifice of other mechanical properties. IMPROVEMENT OF THE FRACTURE TOUGHNESS and impact resistance of rigid unsaturated polyester has played an important role in the development of high-performance polymeric composites. Unsaturated polyesters can be modified by numerous chemical and physical methodsAmong physical modifications, the use of dispersed elastomers for en hancement of toughness in unsaturated polyester resins and molding ma terials has frequently been reported (4-17). These elastomers include both solid and liquid rubbers.

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Unsaturated polyesters based on bis(2-hydroxyethyl)terephthalate

Cited by 37 publications

References 4 publications

Mechanical characterization and chemical resistances of cured unsaturated polyester resins modified with vinyl ester resins based on recycled poly(ethylene terephthalate)

Mechanical characterization and chemical resistances of cured unsaturated polyester resins modified with vinyl ester resins based on recycled poly(ethylene terephthalate)

Modified unsaturated polyester resins synthesized from poly(ethylene terephthalate) waste, 1. Synthesis and curing characteristics

Toughened Unsaturated Polyester Block Copolymers

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