Mechanical and Thermo-Physical Properties of Short Glass Fiber Reinforced Polybutylene Terephthalate upon Aging in Lubricant/Refrigerant Mixture

Pereira, Guilherme Cybis; Rzatki, Felipe Darabas; Mazzaferro, Luca; Forin, Daniel Maldonado; Barra, Guilherme Mariz de Oliveira

doi:10.1590/1980-5373-mr-2016-0339

Cited by 13 publications

(6 citation statements)

References 23 publications

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“…This is because polymer chains are less prone to relaxation mechanisms. The material is less ductile and offers greater resistance and a higher modulus of elasticity, while properties worsen with temperature and presence of liquids [34].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Moduli of Polybutylene Terephthalate Glass Fiber Reinforced in High-Temperature Environments

et al. 2021

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The aim of this work was to show the evolution over time of the dynamic moduli in components made of Polybutylene Terephthalate reinforced with glass fiber when they are held to temperatures close to the glass transition temperature over time. For this purpose, PBT samples reinforced with short, glass fibers of Ultradur® material with 0%, 20%, and 50% in weight content were tested. Dynamic moduli showed an increment with glass fiber content showing a nonlinear behavior with the temperature. The evolution of storage modulus was depicted by means of a modified law of mixtures with an effectiveness factor depending on temperature and fiber content, whereas the evolution over time was obtained with a time–temperature transformation generated with the TTS Data Analysis software of TA-instruments for a given temperature. Storage modulus showed a linear relationship with glass fiber content when components were held to temperatures near to their respective glass transition temperature, obtained from the maximum of loss modulus curve with temperature. In summary, the value and evolution of dynamic moduli of PBT samples improved with glass fiber content, allowing us to increase the durability of components when they are submitted to high-temperature environments.

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Section: Introductionmentioning

confidence: 99%

Dynamic Moduli of Polybutylene Terephthalate Glass Fiber Reinforced in High-Temperature Environments

et al. 2021

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“…SPO‐2 is very similar to SPO‐1, but without free alcohols and/or water. SPO‐2 has also a higher content of esters in the mixture which corresponds to the information of the manufacturer that it contains ester oils 33 . SPO‐3 looks to be mainly an aliphatic, paraffin based oil 34 with a very small content of esters—fatty acid esters 31 are stated as an ingredient by the manufacturer.…”

Section: Resultsmentioning

confidence: 81%

“…SPO-4 consists mainly of aliphatic esters, according to the manufacturer of ester oils. 33 SPO-4 is very similar to SPO-5 which is a food-grade rapeseed oil. SPO-5 shows additionally unsaturated aliphatic structures, very probably from unsaturated acids (e.g., oleic acid, linoleic acid).…”

Section: Physical Properties and Spectroscopic Studies Of Spinning Oilsmentioning

confidence: 89%

“…SPO-2 has also a higher content of esters in the mixture which corresponds to the information of the manufacturer that it contains ester oils. 33 SPO-3 looks to be mainly an aliphatic, paraffin based oil 34 with a very small content of esters-fatty acid esters 31 are stated as an ingredient by the manufacturer. The etching of LF by SPO-3 is not so obvious, but we assume that there are some emulsifiers or other additives in the spinning oil leading to etching of PEG in the LF.…”

Section: Physical Properties and Spectroscopic Studies Of Spinning Oilsmentioning

confidence: 99%

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Screening of spinning oils for melt‐spun lignin‐based carbon fiber precursors

Enengl

Lone

Unterweger

et al. 2022

J of Applied Polymer Sci

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For the improvement of the processing of melt-spun lignin-based fibers, the use of a spinning oil is necessary. The use of spinning oils is standard for the processing of PAN based carbon fiber precursors. Since no commercial spinning preparations for lignin fibers are available on the market, a study on different oils, such as technical oils, food-grade oils or spinning avivages, is performed. A stepwise approach with applied tests (viscosity measurement, fiber etching, melt-spinning, stabilization, carbonization) was developed to eliminate oils which are not suitable. The physical properties of the tested oils are determined and spectroscopic studies of these avivages are performed. Mechanical properties are characterized for as-spun lignin fibers, stabilized lignin-based fibers and lignin-based carbon fibers with and without a spinning preparation. Four of seven tested spinning oils improve the handling during the processing of ligninbased fibers but only two spinning oils lead to good quality carbon fibers and improve even the tensile strength of the resulting carbon fibers.

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“…PBT is a thermoplastic polyester compound, and its monofilament does not easily absorb water. Importantly, it exhibits resistance to heat and chemicals, and its bristles do not splay easily. Therefore, PBT bristles are recommended for extended use.…”

Section: Discussionmentioning

confidence: 99%

Measurement of bristle splaying of toothbrushes using digital imaging and evaluation of plaque removal efficacy over 3 months: A randomized controlled trial (RCT)

Kaneyasu

Shigeishi

Maehara

et al. 2020

Int J Dental Hygiene

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Objective The aim of this study was to develop an objective method to assess the degree of bristle splaying of used manual toothbrushes and to investigate their plaque removal efficacy. Methods A randomized controlled trial targeting Hiroshima University students was performed to assess the plaque removal efficacy of polybutylene terephthalate (PBT) manual toothbrushes. Participants were randomly assigned to the soft toothbrush group (n = 40) or the medium toothbrush group (n = 40). A small number of participants discontinued the intervention for personal reasons in both the medium (n = 6) and soft (n = 2) toothbrush groups. Toothbrushes were collected immediately after first use (T0: baseline), after 1 month of use (T1: month 1), after 2 months of use (T2: month 3) and after 3 months of use (T3: month 6), following the allocation of a new toothbrush. The bristle surface area was measured using digital software. Results The surface area of the bristles was significantly greater at T1, T2 and T3 than at T0 in the medium toothbrush group (n = 34) and soft toothbrush group (n = 38) (P < .001). Importantly, plaque removal efficacy, calculated from a modified plaque control record score and modified patient hygiene performance score, was significantly lower at T2 than at T0 in both groups. Conclusions Our method for evaluation of bristle splaying is considered to be reliable and reproducible. PBT toothbrushes may become less effective after two months of use.

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Mechanical and Thermo-Physical Properties of Short Glass Fiber Reinforced Polybutylene Terephthalate upon Aging in Lubricant/Refrigerant Mixture

Cited by 13 publications

References 23 publications

Dynamic Moduli of Polybutylene Terephthalate Glass Fiber Reinforced in High-Temperature Environments

Dynamic Moduli of Polybutylene Terephthalate Glass Fiber Reinforced in High-Temperature Environments

Screening of spinning oils for melt‐spun lignin‐based carbon fiber precursors

Measurement of bristle splaying of toothbrushes using digital imaging and evaluation of plaque removal efficacy over 3 months: A randomized controlled trial (RCT)

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