Effect of reactive polyurethane on toughness of unsaturated polyester resin

Min, Kyung‐Eun; Hwang, Yeong-Geun; Choi, Gwan-Young; Kim, Ho-Gyum; Kim, Woo‐Sik; Lee, Dong‐Ho; Park, Lee-Soon; Seo, Kap-Ho; Kang, Inn‐Kyu; Jun, Il-Ryun; Lim, Jeong-Cheol; Song, Hwan‐Jin

doi:10.1002/app.10169.abs

Cited by 2 publications

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“…However, up to now there is no proof of these advantages in the literature besides the use of thermoplastic PU as a low-profile/-shrinkage additive. 17,18 Furthermore, spring-in of composite parts manufactured with PU resin has not yet been investigated.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of the spring-in of angled brackets manufactured using different resins and fiber textiles

Bernath

Groh

Exner

et al. 2019

Journal of Composite Materials

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Process-induced distortion of composite structures often leads to a violation of tolerances, making the assembly of components difficult and expensive. It therefore can inhibit a cost-effective mass production of high-performance composite structures. Process-induced distortion is often introduced by curved regions of a part due to spring-in. Main drivers are chemical shrinkage of the resin and thermal expansion of both fiber and resin during cooling after demolding. Both contribute to residual strains and consequently lead to distortion of the manufactured part. The spring-in phenomenon has been already addressed in many studies. However, variations in manufacturing and specimen properties inhibit a detailed comparison of the results. Hence, it is difficult to isolate major influencing parameters. Here we show spring-in results of specimens that were manufactured using the very same experimental setup and laminate configuration but different resin and fiber types. It is therefore possible to identify the interaction of the curing temperature and the maximum achievable glass transition temperature of the individual resins as a major influencing factor. Furthermore, it is shown that the properties of the investigated resins do not differ largely in terms of thermal expansion and chemical shrinkage. Moreover, the latter was measured using two different techniques to enable a comparison. Numerical spring-in prediction revealed good accuracy throughout the investigated specimen configurations. Limitations found are the influence of the sewing of fiber textiles and the sensitivity of the model to gradual changes of the layup. Moreover, different homogenization techniques are compared with regard to spring-in prediction accuracy.

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of the spring-in of angled brackets manufactured using different resins and fiber textiles

Bernath

Groh

Exner

et al. 2019

Journal of Composite Materials

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show abstract

“…[1][2][3] The application of UPR is severely affected because of its large volume shrinkage rate (up to 7-10%) and brittleness in the curing process. 4,5 In recent years, natural fibre as a renewable green resource with its low cost, low density and biodegradability can be used as automotive and building-up materials of UPR replacing glass fibre. [6][7][8] The application of natural fibers as reinforcements in composite materials requires a strong adhesion between the fibre and UPR.…”

Section: Introductionmentioning

confidence: 99%

Synergistically modified unsaturated polyester resin with polyester urethane and montmorillonite: microstructure and properties

Cai

Pan

Zhang³

et al. 2006

Polymers for Advanced Techs

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Microstructure, reacting degree and main properties of synergistically modified unsaturated polyester resin (UPR) with polyester urethane (PU) and organically-modified montmorillonite (OMT) are studied in this paper by scanning electron microscopy (SEM), X-ray diffraction (XRD), FT-IR, contact angle and mechanical properties. The research shows good compatibility of PU with natural fibre and that the contact angle of modified UPR and natural fibre is decreased. Nanocomposites are made using OMT and the impact section of synergistically modified UP composites with PU and OMT shows the toughness breaking. With the increased addition of PU and OMT, the impact strength is increased, the flexural modulus and the cured shrinkage rate are decreased. The testing of mechanical properties shows that when the content of PU is 5% and that of OMT is 1%, the impact strength is increased 80% or above, the decrease of flexural modulus is less than 20% and the cured shrinkage rate is less than 4%. A PU and OMT system was found to have a synergistic effect on the toughness of UPR.

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Effect of reactive polyurethane on toughness of unsaturated polyester resin

Cited by 2 publications

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Experimental and numerical study of the spring-in of angled brackets manufactured using different resins and fiber textiles

Experimental and numerical study of the spring-in of angled brackets manufactured using different resins and fiber textiles

Synergistically modified unsaturated polyester resin with polyester urethane and montmorillonite: microstructure and properties

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