Thermal properties of thermoset polymers

Vengatesan, M. R.; Varghese, Anish; Mittal, Vikas

doi:10.1016/b978-0-08-101021-1.00003-4

Cited by 16 publications

(11 citation statements)

References 218 publications

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“…However, cross-linking of thermoset materials often leads to decreased crystallinity or fully amorphous materials with linear degradation rates and predictable mechanical strength loss. Furthermore, thermoset polyesters can offer enhanced performance in combination with improved thermal stability, chemical resistance, and structural integrity [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

Review on the Impact of Polyols on the Properties of Bio-Based Polyesters

et al. 2020

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Bio-based polyol polyesters are biodegradable elastomers having potential utility in soft tissue engineering. This class of polymers can serve a wide range of biomedical applications. Materials based on these polymers are inherently susceptible to degradation during the period of implantation. Factors that influence the physicochemical properties of polyol polyesters might be useful in achieving a balance between durability and biodegradability. The characterization of these polyol polyesters, together with recent comparative studies involving creative synthesis, mechanical testing, and degradation, have revealed many of their molecular-level differences. The impact of the polyol component on the properties of these bio-based polyesters and the optimal reaction conditions for their synthesis are only now beginning to be resolved. This review describes our current understanding of polyol polyester structural properties as well as a discussion of the more commonly used polyol monomers.

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Section: Introductionmentioning

confidence: 99%

Review on the Impact of Polyols on the Properties of Bio-Based Polyesters

et al. 2020

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“…Conventional thermosets are highly attractive in today’s market due to their excellent characteristics, including thermal stability, chemical resistance, and excellent mechanical properties [ 1 , 2 , 3 ]. Some of the most used thermoset resins correspond to unsaturated polyester, epoxy resin, phenolic resin, and isocyanates, which are derived from petroleum-based resources [ 4 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Bio-Based UV-Cured Epoxy Vitrimer from Castor Oil

et al. 2023

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Vitrimers brought new properties in thermosets by allowing their reshaping, self-healing, reprocessing, and network rearrangement without changing structural integrity. In this study, epoxidized castor oil (ECO) was successfully used for the straightforward synthesis of a bio-based solvent-free vitrimer. The synthesis was based on a UV-curing process, which proceeded at low temperatures in the absence of any solvents, and within a short time. Real time Fourier-transformed infrared spectroscopy and photo-DSC were exploited to monitor the cationic photocurable process. The UV-cured polymer networks were able to efficiently undergo thermo-activated bond exchange reactions due to the presence of dibutyl phosphate as a transesterification catalyst. Mechanical properties, thermal resistance, glass transition temperature, and stress relaxation were investigated as a function of the amount of transesterification catalyst. Mechanical properties were determined by both DMTA and tensile tests. Glass transition temperature (Tg) was evaluated by DMTA. Thermal stability was assessed by thermogravimetric analysis, whilst vitrimeric properties were studied by stress relaxation experiments. Overall, the ECO-based vitrimer showed high thermal resistance (up to 200 °C) and good mechanical properties (elastic modulus of about 10 MPa) and can therefore be considered as a promising starting point for obtaining more sustainable vitrimers.

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“…In contrast with thermoplastics, thermosetting materials do not melt when heated, instead they tend to burn and degrade. The crosslinked nature of thermosetting materials results in high strength, stiffness, and hardness compared to thermoplastic polymers [ 3 , 18 , 19 , 20 ]. This is one of the substantial differences between the traditional casting patterns obtained by injection molding of refractory wax, and the novel casting patterns made by vat photopolymerization 3D printing techniques.…”

Section: Introductionmentioning

confidence: 99%

Large Scale Vat-Photopolymerization of Investment Casting Master Patterns: The Total Solution

Sameni

Ozkan

Karmel³

et al. 2022

Polymers

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The material properties and processing of investment casting patterns manufactured using conventional wax injection Molding and those manufactured by vat photopolymerization can be substantially different in terms of thermal expansion and mechanical properties, which can generate problems with dimensional accuracy and stability before and during ceramic shelling and shell failures during the burn-out of the 3D printed casting patterns. In this paper and for the first time, the monofunctional Acryloyl morpholine monomer was used for 3D printing of casting patterns, due to its thermoplastic-like behavior, e.g., softening by heat. However, the hydrophilic behavior of this polymer led to an incorporation of up to 60 wt% of Hexanediol diacrylate, to control the water absorption of the network, which to some extent, compromised the softening feature of Acryloyl morpholine. Addition of a powdered wax filler resulted in a delayed thermal decomposition of the polymer network, however, it helped to reduce the thermal expansion of the parts. The dimensional accuracy and stability of the wax-filled formulation indicated an excellent dimensional tolerance of less than ±130 µm. Finally, the 3D printed patterns successfully went through a burn out process with no damages to the ceramic shell.

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Thermal properties of thermoset polymers

Cited by 16 publications

References 218 publications

Review on the Impact of Polyols on the Properties of Bio-Based Polyesters

Review on the Impact of Polyols on the Properties of Bio-Based Polyesters

Sustainable Bio-Based UV-Cured Epoxy Vitrimer from Castor Oil

Large Scale Vat-Photopolymerization of Investment Casting Master Patterns: The Total Solution

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