Evaluation of postcuring process on the thermal and mechanical properties of the Clear02™ resin used in stereolithography

Mendes‐Felipe, Cristian; Patrocinio, David; Laza, José Manuel; Ruiz‐Rubio, Leire; Vilas, José Luis

doi:10.1016/j.polymertesting.2018.10.018

Cited by 45 publications

(33 citation statements)

References 25 publications

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“…When it comes to thermostable DSC curves, the literature indicates that it is possible to observe exothermic peaks that would correspond to a cure favoured by the increase in temperature of the sample during said study. These peaks would decrease or even disappear when the degree of cure is increased by the application of some post-curing process of successive DSC cycles to the sample [39,43,44].…”

Section: Thermal Characterisationmentioning

confidence: 99%

Synthesis and Characterisation of Acrylic Resin-Al Powder Composites Suitable for Additive Manufacturing

et al. 2020

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Stereolithography is an additive manufacturing technology commonly used to build either prototypes or final parts. Nevertheless, the manufacture of structural parts has been ruled out owing to the poor mechanical properties of conventional UV-curable resins. Moreover, the inventory of available commercial resins is still limited and they exhibit low thermal and electrical conductivity values. In this work, some composite materials were designed using Al microparticles dispersed within an SLA commercial resin matrix. These composites overcame the difficulties caused by the light scattering effect during the photopolymerisation process in the SLA technology. Dispersion of the filler was characterised by means of SEM/EDX and AFM. The composites exhibited improved thermal and mechanical behaviour in comparison with the pristine resin. The simplicity of the synthesis method used to prepare the composites provides a convenient starting point to explore new ways of designing composites for SLA with improved mechanical and functional properties.

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Section: Thermal Characterisationmentioning

confidence: 99%

Synthesis and Characterisation of Acrylic Resin-Al Powder Composites Suitable for Additive Manufacturing

et al. 2020

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“…Another potential cause of these differences in properties can be assumed based on the mechanics of the SLA fabrication process, namely that structural imperfections exist throughout SLA-fabricated hydrogels, caused by the nature of its layer-by-layer curing process. Through this layer-by-layer curing, localised regions of unreacted monomer are formed which affect the overall strength of the hydrogel [ 16 ]. In theory, the UV chamber exposure would polymerise these pockets of unreacted monomer; however, there is credence lent to this theory by the slightly increased presence of unreacted monomer in SLA samples, as outlined in Section 3.1 .…”

Section: Discussionmentioning

confidence: 99%

“…A common limitation of this layer-by-layer approach to photocuring is the potential to leave areas of the forming design under or over-polymerised, thus affecting the properties of samples prepared by this method. In order to counteract this effect, a post-cure of the polymer is typically carried out [ 16 ]. However, this runs the risk of over-curing already polymerised sections which can be detrimental to the mechanical properties of the polymer [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Stereolithography 3D Printing on the Properties of PEGDMA Hydrogels

2020

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Stereolithography (SLA)-based 3D printing has proven to have several advantages over traditional fabrication techniques as it allows for the control of hydrogel synthesis at a very high resolution, making possible the creation of tissue-engineered devices with microarchitecture similar to the tissues they are replacing. Much of the previous work in hydrogels for tissue engineering applications have utilised the ultraviolet (UV) chamber bulk photopolymerisation method for preparing test specimens. Therefore, it is essential to directly compare SLA 3D printing to this more traditional approach to elucidate the differences in hydrogels prepared by each fabrication method. Polyethyleneglycol dimethacrylate (PEGDMA) is an ideally suited material for a comparative study of the impact that SLA fabrication has on performance, as the properties of traditional UV chamber-cured hydrogels have been extensively characterised. The present study was conducted to compare the material properties of PEGDMA hydrogels prepared using UV chamber photopolymerisation and SLA 3D printing. From the subsequent testing, SLA-fabricated hydrogels were shown to maintain similar thermal and chemical performance to UV chamber-cured hydrogels but had a higher compressive strength and tensile stiffness, as well as increased hydrophilicity. These differences are attributed to the increased exposure to UV light SLA samples received compared to traditionally UV chamber-cured samples.

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“…Wu et al investigate the evolution of mechanical properties during photopolymerisation and build up a model for the finite element analysis of residual stresses and bending strains, see [20]. The experimental investigation of different postcuring processes and their influence on the thermal and mechanical properties of a commercially available photopolymer is the main part of [21]. Calorimetric measurements and thermogravimetric as well as dynamic mechanical analyses are conducted incorporating two different postcuring mechanisms (with and without UV light exposure) and several curing times for printed specimens.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and modelling of the curing behaviour of photopolymers

et al. 2020

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This paper focuses on the experimental investigation and modelling of the crosslinking reaction of photopolymers used in additive manufacturing processes such as digital light processing and stereolithography. Starting with general mathematical concepts for the description of the material behaviour of polymeric materials, the importance of modelling the crosslinking reaction is emphasized. In order to characterise the crosslinking reaction experimentally, photocalorimetric measurements with varying isothermal temperature and light intensity are shown. From the exothermic heat flows measured during the crosslinking reaction, the degree of cure can be determined for each experimental scenario as a function of time. It is shown that the test temperature and light intensity have a significant influence on the crosslinking reaction. A modelling approach for the description of the crosslinking reaction incorporating temperature and light intensity is presented. Moreover, parameter identification and a comparison of the proposed model with the experiments are conducted. The indentified model has an excellent match with experimental data, resulting in a least square error smaller than 3 %. The proposed model and identification method opens up several extensions for the modelling of the material behaviour.

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Evaluation of postcuring process on the thermal and mechanical properties of the Clear02™ resin used in stereolithography

Cited by 45 publications

References 25 publications

Synthesis and Characterisation of Acrylic Resin-Al Powder Composites Suitable for Additive Manufacturing

Synthesis and Characterisation of Acrylic Resin-Al Powder Composites Suitable for Additive Manufacturing

Effect of Stereolithography 3D Printing on the Properties of PEGDMA Hydrogels

Experimental investigation and modelling of the curing behaviour of photopolymers

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