Research Article
Method of Increasing the Fracture Toughness of Unsaturated Polyester with the Addition of Vinyl Ester as a Material for Automotive Body
Nusyirwan Nusyirwan*
,
Hayatul Fikri,
Xhycho Vachanidyo
Issue:
Volume 9, Issue 1, June 2024
Pages:
1-9
Received:
2 January 2024
Accepted:
10 January 2024
Published:
2 April 2024
Abstract: Unsaturated polyester is the polymer material most widely used for matrix composites in the field of construction engineering, including for ships, automotive components and other engineering fields. The weakness of this polymer is that it is brittle and brittle and is unable to withstand cracking loads due to having cross-linked molecules that easily link together. The study to improve it was mixing with vinyl ester which succeeded in making the polyester crack resistant which was tested using a CTM machine and the fracture was observed using an SEM microscope. The test results showed that the polyester polymer mixed with 30% vinyl ester showed the highest increase in fracture strength, which was equal to K1c = 1.67 N.mm0.5 compared to pure polyester, only K1c = 0.77 N.mm0.5 can increase (216 %). Increasing the mixture content of 30% vinyl ester in polyester will change the brittle nature of unsaturated polyester to become more resilient because the vinyl ester molecules break the bonds of the polyester molecular chains.
Abstract: Unsaturated polyester is the polymer material most widely used for matrix composites in the field of construction engineering, including for ships, automotive components and other engineering fields. The weakness of this polymer is that it is brittle and brittle and is unable to withstand cracking loads due to having cross-linked molecules that eas...
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Research Article
Practical Technology of Toughening Epoxy Resin (II): Modification Effects of Special Engineering Plastics on Epoxy Resin
Issue:
Volume 9, Issue 1, June 2024
Pages:
10-22
Received:
12 April 2024
Accepted:
27 April 2024
Published:
17 May 2024
Abstract: The effects of Special engineering plastics (SEP) such as polyether ether ketone (PEEK), polyimide (PI), thermoplastic polyimide (TPI), polyphenylene sulfide (PPS), polysulfone (PSF), liquid crystal polymer (LCP), polyaromatic (PAR) on the mechanical, thermal and electrical properties of epoxy resins were studied in this paper. The engineering plastics with rigid and active elements produce differential phase in the epoxy curing process, which can absorb energy under stress, prevent micro-crack diffusion, and improve the mechanical properties of epoxy resin, including tensile, compression and impact strength. SEP with better heat resistance than epoxy resins are beneficial for improving the heat resistance of epoxy resins. During the epoxy curing process, strong intermolecular forces are generated between SEP and epoxy resin, which further enhances the heat resistance of modified epoxy resins. Better insulation of epoxy resin are achieved by adding engineering plastics with fine insulation equipment. PSF with poor dispersion aggregates to form a weak interface layer, which first fails under stress, and its main mechanical properties slightly decrease. The dispersion of pulp like LCP in epoxy resin is poor, and there is no significant improvement in the mechanical properties of epoxy resin. PAR are difficult to form a homogeneous phase in epoxy resin and cannot be used for epoxy resin modification research.
Abstract: The effects of Special engineering plastics (SEP) such as polyether ether ketone (PEEK), polyimide (PI), thermoplastic polyimide (TPI), polyphenylene sulfide (PPS), polysulfone (PSF), liquid crystal polymer (LCP), polyaromatic (PAR) on the mechanical, thermal and electrical properties of epoxy resins were studied in this paper. The engineering plas...
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