Effect of fiber content on flexural properties of glass fiber-reinforced polyamide-6 prepared by injection molding

Nagakura, Manamu; Tanimoto, Yasuhiro; Nishiyama, Norihiro

doi:10.4012/dmj.2016-252

Cited by 11 publications

(11 citation statements)

References 25 publications

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“…However, all the results proved that nylon 6,6 make the interactions amongst the components stronger and this is proved by the solid-like behaviour of the composite at higher composition of glass fibre. The 30% 50% Glass fibre wt.% results obtained are in good agreement with previous literature concerning fiber reinforced composite (Garcia et al, 2018;Nagakura et al, 2017;Mortazavian and Fatemi, 2015).…”

Section: Resultssupporting

confidence: 92%

“…There are many ejection systems used to eject the material like pin ejection, sleeve ejection, air ejection, which depending upon the nature of the product and mold. Normally the injection molding machine is divided into two parts provided with the mold between injection and clamping unit (Nagakura et al, 2017). The injection unit consists of a screw motor, a barrel, a hopper, a heater band, a stationary plate and aninjection nozzle.…”

Section: Methodsmentioning

confidence: 99%

“…The molten plastic is injected into the mold cavity with the help of a nozzle. A heater band is provided at the nozzle tip known as nozzle heater (Nagakura et al, 2017). The basic purpose of the clamping unit is to grip the mold throughout the injection process.…”

Section: Methodsmentioning

confidence: 99%

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Effect of Reinforced Glass Fibre on the Mechanical Properties of Polyamide

Khan

Mushtaq

2021

Pak. j. sci. ind. res. Ser. A: phys. sci.

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The aim of this study is to enhance the tensile and flexural strength of polyamide (nylon 6, 6) by incorporation of glass fibre. Nylon has high elasticity, strength, toughness and maintain mechanical properties at elevated temperatures. The method employed for enhancement of properties is by the reinforcement of glass fibre. Glass fibre is the most extensively used reinforcement material. It is a lightweight, extremely solid, durable, low cost material that moderafly stiff. The composition of glass fibre was kept at 0 wt.%, 30 wt.% and 50 wt.% in nylon 6,6 blend. Initially, samples were manufactured by injection molding of nylon 6,6 and glass fibre. The pressure and velocity profiles at 0 wt.%, 30 wt.% and 50 wt.% reinforced nylon 6,6 are also compared. The samples thus formed were checked for shrinkage. The samples were tested for their tensile and flexural properties. The mechanical properties of polyamide (nylon 6,6) significantly improves by increasing glass fibre reinforcement.

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Section: Resultssupporting

confidence: 92%

Section: Methodsmentioning

confidence: 99%

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Effect of Reinforced Glass Fibre on the Mechanical Properties of Polyamide

Khan

Mushtaq

2021

Pak. j. sci. ind. res. Ser. A: phys. sci.

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“…[ 5 ] The literature suggests that the nylon surface is more easily colonized by Candida species than that of PMMA,[ 30 ] which could clinically favor the appearance of pathologies, e.g., prosthetic stomatitis. [ 30 ] It has been reported that thermoplastic resins exhibit lower flexural strength,[ 46 47 48 49 ] elasticity modulus,[ 46 ] and hardness[ 47 ] in relation to heat-curing PMMA resin. Even when surface was treated with silica[ 34 46 ] and 4-META/MMA-TBB[ 46 ] resin, thermoplastic resins present great difficulty at bonding to the acrylic reliner, suggesting that relining procedures should only be performed in laboratory.…”

Section: Discussionmentioning

confidence: 99%

Nonmetal clasp dentures: What is the evidence about their use?

Mendoza-Carrasco

Hotta

Sugio

et al. 2020

J Indian Prosthodont Soc

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The aim was to discuss the indications, contraindications, advantages, and disadvantages of Nonmetal clasp dentures (NMCDs), as well as the most relevant properties of its constituent materials. A search was conducted using the keywords: “nonmetal clasp dentures,” “thermoplastic resin,” “flexible resin removable partial denture,” “polyamide,” and “nylon” in databases PubMed/Medline, Lilacs, SciELO, and textbooks between 1955 and 2020. Theses and texts without reliable sources of publication were excluded. Once the analysis instruments were determined, the data were analyzed and discussed. NMCDs present high flexibility, easy adaptation to the abutments, color compatibility and biocompatibility with the oral mucosa, and absence of visible metal clasps. However, they need laboratory relining, grinding, and polishing, do not have criteria for its planning, become rougher and stained over time, and are able to traumatize supporting tissues. The association with metal components seems to be an alternative to increase the success of NMCDs by combining esthetics and biomechanical principles of conventional removable partial dentures. The lack of long-term clinical studies makes the professionals to rely solely on previous experiences or on the manufacturers' recommendations. It suggested that NMCDs must be indicated with caution when not used temporarily.

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“…However, the most effective reinforcement is yet to be determined (18). The glass fiber-reinforcement have showed promising results in previous studies (9,19,20).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of flexural properties and dynamic mechanical analysis of glass fiber-reinforced polyamide resin

Ünver¹,

Yildirim²

2021

eor

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The aim of this study was to evaluate flexural strength, elastic modulus and dynamic mechanical analysis (DMA) of heat-polymerized polymethyl methacrylate resin, polyamide resin and glass fiber-reinforced polyamide resin. Materials and MethodsThree groups were determined according to denture base materials as polymethyl methacrylate resin (H), polyamide resin (P) and glass fiber reinforced polyamide resin (R). Sixteen specimens for each denture base material were prepared with dimensions of 64x10x3.3 mm for three-point bending test. Two specimens for each denture base material were prepared with dimensions of 30x10x3 mm for DMA. Polymethyl methacrylate and polyamide specimens were prepared according to the manufacturer's recommendations. The silane was applied to glass fibers (4.5 mm length) 2% by weight of the polyamide resin, they were placed in polyamide resin cartilages and injected to the mold. The thermal aging procedure was applied to half of specimens of each material (n=8). Flexural strength and elastic modulus of the specimens were determined by three-point bending test at a speed of 5 mm/ min. DMA was performed to 1 specimen from each group to evaluate viscoelastic properties. Data were analyzed with one-way ANOVA, Tukey and Paired t tests. ResultsA statistically significant difference was found in flexural strength and elastic modulus values of denture base materials (p=0.00). The highest flexural strength and elastic modulus values were observed in polymethyl methacrylate group. There was no significant difference between polyamide and glass-fiber reinforced polyamide groups (p=0.497). No significant difference was determined in all threedenture base materials before and after aging procedure. ConclusionThe reinforcement with glass-fibers did not affect the flexural strength and elastic modulus of polyamide resin.

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Effect of fiber content on flexural properties of glass fiber-reinforced polyamide-6 prepared by injection molding

Cited by 11 publications

References 25 publications

Effect of Reinforced Glass Fibre on the Mechanical Properties of Polyamide

Effect of Reinforced Glass Fibre on the Mechanical Properties of Polyamide

Nonmetal clasp dentures: What is the evidence about their use?

Evaluation of flexural properties and dynamic mechanical analysis of glass fiber-reinforced polyamide resin

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