Miscellaneous Plastics Materials

Brydson, J.A.

doi:10.1016/b978-0-7506-1864-9.50036-3

Cited by 66 publications

(99 citation statements)

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“…18,19 They used the permeant gases N 2 , O 2 , CO 2 , and H 2 S (at 30°C), with a dataset of 22 polymers ranging from low permeability ones such as Mylar (PET) to highly permeable ones such as the elastomers natural rubber (NR) and polyisobutene (PIB) ( Table I). Although the P values ranged over three orders of magnitude, nevertheless, the mean value of the ratio P(O 2 )/P(N 2 ) was 3.8 (8), while for P(CO 2 )/P(N 2 ), it was 24(7), and for P(H 2 S)/P(N 2 ), it was 22(7) (Fig. 1).…”

Section: Stannett-szwarc Correlationmentioning

confidence: 99%

“…In the case of polymers, permeation is important in a whole host of technical processes: dialysis, osmosis, reverse osmosis, pervaporation, ultrafiltration, and other membrane-separation processes; the dyeing of fibers and textiles; the behavior of barrier materials (balloons, geomembranes, gloves, packaging, tires, and so forth); the design of controlled drug-release systems; and the migration of plasticizers and other additives in polymers. [1][2][3][4][5][6][7][8] In the present context, permeation refers to the process in which the permeant gas (or vapor) G passes through a layer (membrane, film, sheet, etc.) of the polymer (the permeate).…”

Section: Introduction General Features Of Permeation Through Polymersmentioning

confidence: 99%

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?Transition-site? model for the permeation of gases and vapors through compact films of polymers

Molyneux¹

2000

J. Appl. Polym. Sci.

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Section: Stannett-szwarc Correlationmentioning

confidence: 99%

Section: Introduction General Features Of Permeation Through Polymersmentioning

confidence: 99%

?Transition-site? model for the permeation of gases and vapors through compact films of polymers

Molyneux¹

2000

J. Appl. Polym. Sci.

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“…As propriedades do PVC podem variar de um polímero extremamente flexível a um polímero extremamente rígido [1,2].…”

Section: Introductionunclassified

Compósitos de PVC rígido e fibras de bananeira: Efeito do tratamento da fibra

2014

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RESUMOO interesse de compósitos de fibras naturais com polímeros termoplásticos vem crescendo a cada ano. As fibras naturais apresentam vantagens como baixa massa específica, baixa abrasividade, baixo custo, são biodegradáveis e autossustentáveis, pois são de origem natural e de fonte renovável. Dentre as resinas termoplásticas viáveis para o emprego de fibras de bananeira destaca-se a resina de poli (cloreto de vinila) -PVC por sua versatilidade em relação a sua formulação, pois há a necessidade da incorporação de aditivos durante o seu processamento, tornando-a adaptável a múltiplas aplicações. O objetivo do presente trabalho foi estudar a influência do tipo de tratamento das fibras de bananeira (FB) nas propriedades do PVC rígido (PVCr). Propriedades mecânicas, estabilidade térmica e absorção de água dos compósitos PVC/FB foram avaliados em relação ao efeito dos tratamentos alcalino, com anidrido maleico e acetilação das fibras de bananeiras. Os compósitos foram obtidos em misturador aberto de dois rolos seguido de injeção dos corpos de provas. Os resultados indicam que o tratamento com anidrido maleico e a acetilação apresentam melhor resistência ao impacto e menor absorção de água do que o tratamento alcalino. As propriedades térmicas não apresentaram alterações significativas com a adição de fibras de bananeiras tratadas e não tratadas. Palavras-chave: poli (cloreto de vinila); fibras de bananeira; tratamento superficial. ABSTRACTThe interest in natural fiber composites with thermoplastic polymers is growing every year. Natural fibers have advantages such as low density, low abrasion, low cost, are biodegradable and self-sustainable, since they are natural and renewable source. Among the thermoplastic resins viable for employment fiber banana stands out poly (vinyl chloride) -PVC for its versatility compared to its formulation, because there is the need to incorporate additives during processing, making adaptable to multiple applications. The objective of this work was to study the influence of type of banana fibers (FB) treatment in the properties of rigid poly (vinyl chloride) (PVC). Mechanical properties, thermal stability and water absorption of composite PVC/FB were evalueted for the effect of alkaline treatments, with maleic anhydride and acetylation of banana fibers. The composites were obtained in two-roll open mixer followed by injection of test samples. The results indicate that treatment with maleic anhydride and acetylation exhibit better impact resistance and lower water absorption than the alkaline treatment. The thermal properties did not change significantly with the addition of banana fibers treated and untreated.

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“…The degradation of the polymer was thought to be the cause of these events. The polymer in the epoxy grout is a polyacrylate or poly (methyl methacrylate), which is widely used as a reactive adhesive [36]. The third reaction commences with dehydration, decomposition and expansion of the cementing material at approximately between 400-575 0 C (C), in which a steady endothermic reaction and a small weight loss were seen.…”

Section: B Morphology Microstructure and Phase Characteristicsmentioning

confidence: 99%

The development and characteristics of a hand-held high power diode laser-based industrial tile grout removal and single-stage sealing system

Lawrence

Minami

Schmidt

et al. 2002

Journal of Laser Applications

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As the field of laser materials processing becomes ever more diverse, the high power diode laser (HPDL) is now being regarded by many as the most applicable tool. The commercialisation of an industrial epoxy grout removal and single-stage ceramic tile grout sealing process is examined through the development of a hand-held HPDL device in this work. Further, an appraisal of the potential hazards associated with the use of the HPDL in an industrial environment and the solutions implemented to ensure that the system complies with the relevant safety standards are given. The paper describes the characteristics and feasibility of the industrial epoxy grout removal process. A minimum power density of approximately 3 kW/cm 2 was found to exist, whilst the minimum interaction time, below which there was no removal of epoxy tile grout, was found to be approximately 0.5 s. The maximum theoretical removal rate that may be achievable was calculated as being 65.98 mm 2 /s for a circular 2 mm diameter beam with a power density of 3 kW/cm 2 and a traverse speed of 42 mm/s. In addition, the characteristics of the single-stage ceramic tile grout sealing are outlined. The single-stage ceramic tile grout sealing process yielded crack and porosity free seals which were produced in normal atmospheric conditions. Tiles were successfully sealed with power densities as low as 550 W/cm 2 and at rates of up to 420 mm/min. In terms of mechanical, physical and chemical characteristics, the single-stage ceramic tile grout was found to be far superior to the conventional epoxy tile grout and, in many instances, matched and occasionally surpassed that of the ceramic tiles themselves.

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Miscellaneous Plastics Materials

Cited by 66 publications

References 0 publications

?Transition-site? model for the permeation of gases and vapors through compact films of polymers

?Transition-site? model for the permeation of gases and vapors through compact films of polymers

Compósitos de PVC rígido e fibras de bananeira: Efeito do tratamento da fibra

The development and characteristics of a hand-held high power diode laser-based industrial tile grout removal and single-stage sealing system

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