Modification of unsaturated polyesters by poly(ethylene glycol) end groups

Schulze, Uwe; Skrifvars, Mikael; Reichelt, Norbert; Schmidt, Hans‐Werner

doi:10.1002/(sici)1097-4628(19970418)64:3<527::aid-app9>3.0.co;2-m

Cited by 32 publications

(13 citation statements)

References 3 publications

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“…The picture should be rounded off with work on the condensation of unsaturated polyesters with poly(ethylene glycol)s [58]. Through the modification, the solubility in styrene could be increased and the tensile strength of the hardened resins improved.…”

Section: Polymers With Special Propertiesmentioning

confidence: 99%

Trends in polymer chemistry 1997 Part 1: Pure research

et al. 1998

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Section: Polymers With Special Propertiesmentioning

confidence: 99%

Trends in polymer chemistry 1997 Part 1: Pure research

et al. 1998

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“…18 The common liquid rubbers used are liquid polybutadiene and liquid butadiene-acrylonitrile with reactive end groups. 19 Block copolymers of UPR containing PEG segments on the polymer main chains were reported by Schulze et al 20 PEG modified unsaturated polyesters are homogeneous systems. The incorporation of flexible polyorganosiloxane segments in the UPR network enhances its flexibility.…”

Section: Introductionmentioning

confidence: 98%

Modification of unsaturated polyesters using polyethylene glycol

Cherian¹,

Thachil²

2007

Plastics, Rubber and Composites

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The fracture toughness and impact resistance of rigid unsaturated polyesters can be modified by various physical and chemical methods. In this study, flexible unsaturated polyesters were prepared by condensation polymerisation of maleic anhydride, phthalic anhydride and propylene glycol in the presence of polyethylene glycol. By this method, copolymers of unsaturated polyesters with polyethylene glycols of different molecular weights were prepared. A two stage process was used for the synthesis, which resulted in segmental structures containing alternating rigid cross-linked segments and linear soft segments displaced regularly in the polymer chain. Properties such as tensile strength, tensile modulus, elongation at break, toughness, impact strength, surface hardness, abrasion resistance and water absorption were tested after the resin was cured in appropriate moulds and compared with those of the control resin. Polyethylene glycols of lower molecular weight (,200) impart flexibility to the polyester chains and increase fracture toughness and impact resistance of rigid unsaturated polyester without seriously affecting other properties. Glass reinforced specimens prepared using the modified resin also show improved toughness and elongation at break.

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“…In order to improve the toughness of normal UP, several modification methods have been studied and reported in the literature. One is to use long‐chain diacids or diols as monomers, such as adipic acid and poly(ethylene glycol) or tung oil . Although this method can achieve modest improvements in toughness, it generally causes serious decreases in the tensile strength and hardness of the resulting materials.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis of silicone‐toughened unsaturated polyester by hydroxyl‐terminated silicone copolycondensation

et al. 2017

J of Applied Polymer Sci

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A facile method is developed to synthesize silicone-toughened unsaturated polyester (SUP-M) by monomer copolymerization of anhydrides and diols with hydroxyl-terminated silicone. The structures and molecular weights of the SUP-M resins were characterized by Fourier transform infrared spectroscopy and gel permeation chromatography, respectively. The gelation time and mechanical properties, including impact strength, flexural strength, and tensile strength, were investigated. The fracture behaviors were studied by scanning electron microscopy, and their glass-transition temperature and storage modulus were measured by dynamic mechanical analysis. The experimental results showed that the impact strength of SUP-M can be obviously improved through copolymerization with a small amount of silicone without decreasing its mechanical properties. The impact strength, flexural strength, and tensile strength of SUP-M-0.5 are as high as 12.5 KJ m 22 , 131 MPa, and 59 MPa, which are increased by 76.1%, 21.2%, and 6.7%, respectively, compared with those of unsaturated polyester. Impacts on SUP-M with low silicone content produce a large number of evenly and regularly distributed continuous narrow crack bands combined with many evenly distributed branching crazes, which are of great benefit in absorbing a large amount of impact energy.

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Modification of unsaturated polyesters by poly(ethylene glycol) end groups

Cited by 32 publications

References 3 publications

Trends in polymer chemistry 1997 Part 1: Pure research

Trends in polymer chemistry 1997 Part 1: Pure research

Modification of unsaturated polyesters using polyethylene glycol

Facile synthesis of silicone‐toughened unsaturated polyester by hydroxyl‐terminated silicone copolycondensation

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