The effects of gas assisted injection molding on the mechanical properties of medical grade thermoplastic elastomers

Hosseini, Ali Masih; Chotenovsky, David; Farrell, Karen Stoll; Farrell, Scott A.; Sparrey, Carolyn J.

doi:10.1016/j.polymertesting.2014.06.003

Cited by 5 publications

(5 citation statements)

References 17 publications

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“…TPEs are employed in industrial applications such as automobile parts and adhesive; and in medical applications namely transdermal patches, surgical films and gaskets, dental and orthodontics materials, and medical devices. [3][4][5][6] Even though TPEs have diverse ranges of applications, the limitations of TPEs are poor mechanical properties 7 and nonbiodegradable. 8 Thus, additives are required in TPE formulation to enhance their physical properties and promote biodegradability.…”

Section: Introductionmentioning

confidence: 99%

“…Medical application accounted for 8% of the market share of TPE in 2021. TPEs are employed in industrial applications such as automobile parts and adhesive; and in medical applications namely transdermal patches, surgical films and gaskets, dental and orthodontics materials, and medical devices 3–6 . Even though TPEs have diverse ranges of applications, the limitations of TPEs are poor mechanical properties 7 and nonbiodegradable 8 .…”

Section: Introductionmentioning

confidence: 99%

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Non‐isocyanate polyurethane‐acrylate as UV‐ and thermo‐responsive plasticizer for thermoplastic elastomer

Lam,

Lee,

Pichika

et al. 2024

J of Applied Polymer Sci

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A UV‐ and thermo‐responsive polyurethane‐acrylate prepolymer was synthesized from palm olein (POo) via a non‐isocyanate route. The process included epoxidation of POo, carbonation of epoxidized palm olein (EPOo) into polycyclic carbonate in a solvent‐free and mild condition (100°C, 1 atm), followed by reacting with ethylene diamine and acrylic acid. The chemical structure of the non‐isocyanate polyurethane‐acrylate (NIPUA) prepolymer was elucidated by 1H and 13C nuclear magnetic resonance (NMR) and Fourier transform‐infrared spectroscopy (FTIR), while weight average molecular weight of NIPUA was determined by gel permeation chromatography (GPC). The NIPUA (0–20 wt%) was incorporated with thermoplastic elastomer (TPE) as a plasticizer and cured under UV light and thermal stimulations. The cured NIPUA/TPE films were characterized by FTIR, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and tensile strength test. Under UV and thermal stimulations, the NIPUA/TPE demonstrated enhanced tensile properties (elongation at break >1280%, Young's modulus ~25 MPa), thermal properties (lower Tg), lower water contact angle, and shortened curing time as compared with the blank TPE. The 20 wt% NIPUA/TPE films exhibited susceptibility to enzymatic biodegradation and noncytotoxic to HEK 293 cells in vitro, demonstrated it's potential as a UV‐ and thermo‐responsive plasticizer for TPE in manufacturing of medical devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Non‐isocyanate polyurethane‐acrylate as UV‐ and thermo‐responsive plasticizer for thermoplastic elastomer

Lam,

Lee,

Pichika

et al. 2024

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…The process is displayed in Figure 1B. In contrast, the short‐shot method has higher requirements on process control than the overflow method, but has better performance in reducing material, energy consumption, and equipment loss 4–8 …”

Section: Introductionmentioning

confidence: 99%

“…In contrast, the short-shot method has higher requirements on process control than the overflow method, but has better performance in reducing material, energy consumption, and equipment loss. [4][5][6][7][8] Considering that FAIM process has an excellent performance for plastic pipe fittings, numerous scholars have carried out related studies. [9][10][11] Liu et al 12,13 studied the influence of mold design and process parameters on the nonuniformity of wall thickness of headlight lampshade parts through simulation and experiment.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of fluid‐assisted injection molding of pipe fittings with different angles by short‐shot method

Huang

Wang

et al. 2022

Engineering Reports

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Based on the self‐assisted injection experimental platform, experimental studies on gas‐assisted injection molding (GAIM), and water‐assisted injection molding (WAIM) of 2 curved pipe fittings by adopting short‐shot method were carried out. UDF model was constructed for numerical simulation analysis. The influence rules of auxiliary medium and bending angle on the terminal morphology, inner wall surface quality at bending angle, medial and lateral residual wall thickness, variation range, and residual wall thickness deviation rate of short‐shot fluid assisted injection molding (SSFAIM) bending samples were compared. Meanwhile, the influence mechanism was investigated. The following experimental findings were obtained. SSFAIM had secondary penetration, while water produced multiple penetrations. There are multiple vacuum shrinkage pores in the unpenetrated area at the end of the SSWAIM sample, as well as serious shrinkage depressions on the surface. The shape of the penetration front of water is arc‐shaped with many penetration holes. The shape of the penetration front of the gas at the end of the SSGAIM sample is “pointy.” Compared with the SSWAIM sample, the residual wall thickness of SSGAIM has a narrow distribution range when the bending angle is 0°. With the increase of the bending angle, the “foaming” phenomenon of the inner wall surface quality at the bending angle of the SSGAIM sample becomes less and less obvious. Moreover, the deviation of the inner and outer residual wall thickness of SSGAIM is more obvious than that of SSWAIM due to the increase of bending angle.

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“…In parallel to the intensive studies on the real flow fields in conventional injection moldings (CIM), understanding the complex flow fields in injection molding technologies with a second fluid injection, such as gas‐assisted injection molding (GAIM), water‐assisted injection molding (WAIM) and multimelt multi‐injection molding (MMMIM) has also been of great interest in that it promotes the “structuring” processing of polymers. Their main feature can be summarized as below.…”

Section: Introductionmentioning

confidence: 99%

Description of second flow field via the deformation of polystyrene phase in high‐density polyethylene matrix

Zhang

Xia

et al. 2016

J of Applied Polymer Sci

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Real flow field has been critical in all kinds of injection molding, not only for understanding morphological evolution, but also for tailoring polymer physical property. Since the relaxation of PS phase in the HDPE matrix is successfully retarded by introduction of additional gas cooling, here, the second flow field in gas‐assisted injection molding is first calculated with the classical models for predicting the shapes of dispersed droplets in immiscible blend. The results indicate high gas penetration pressure facilitates strong second flow field. Gas penetration time is inversely proportional to the triggered flow intensity, which can be used for the qualitative comparison of the flow fields under various conditions. Importantly, the flow field can be designed by tailoring melt advancing rate, such as the penetration power and/or the penetration resistance of second fluid, which contributes to realizing the optimum coupling between external fields and chain architectures. Besides, this work opens a window for the understanding of real flow field under various processing conditions. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43374.

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The effects of gas assisted injection molding on the mechanical properties of medical grade thermoplastic elastomers

Cited by 5 publications

References 17 publications

Non‐isocyanate polyurethane‐acrylate as UV‐ and thermo‐responsive plasticizer for thermoplastic elastomer

Non‐isocyanate polyurethane‐acrylate as UV‐ and thermo‐responsive plasticizer for thermoplastic elastomer

Experimental analysis of fluid‐assisted injection molding of pipe fittings with different angles by short‐shot method

Description of second flow field via the deformation of polystyrene phase in high‐density polyethylene matrix

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