George Seferis

Seferis, George; Keeley, Edmund; Sherrard, Philip

doi:10.1515/9781400884049

Cited by 13 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Bulky, conjugated aromatic substituents, particularly hetero-aromatic substituents, such as carbazole have high refractive indices. Carbazole based polymers [51][52][53][54][55][56] are reported to have good optical properties and ease of processing.…”

Section: Advantages Disadvantagesmentioning

confidence: 99%

Novel way of making high refractive index plastics; metal containing polymers for optical applications

et al. 2009

View full text Add to dashboard Cite

Abstract:Plastics are being preferred in almost all possible applications of materials. Several new applications including optical devices are being developed using plastics replacing conventional materials like inorganic glass etc. For the optical applications, the most important properties of plastics essential for their desired performance include refractive index, Abbe number, optical clarity, etc. The biggest challenge in developing suitable materials for optical applications has always been to meet the criteria of high refractive index along with a high Abbe number. Normally, if the refractive index increases, the Abbe number automatically decreases. The researchers have tried several approaches to deal with this typical challenge without which it is not possible to develop novel optical plastics. Presently the most popularly known optical plastics includes polymers such as polymethacrylates, polyurethanes, polycarbonates, polystyrene and diethylene glycol bis allyl carbonate. The latest material of high refractive index plastics with a refractive index of 1.67 belongs to the polythiourethanes chemistry. Several approaches are being tried world over, to develop materials of high refractive index. One of the approaches being pursued for enhancement of refractive index of existing monomers pertain to the incorporation of metals or metal salts in the matrices. The other commonly tried but difficult to achieve approaches pertain to the preparation of nanoparticles or nanocomposites.

show abstract

Section: Advantages Disadvantagesmentioning

confidence: 99%

Novel way of making high refractive index plastics; metal containing polymers for optical applications

et al. 2009

View full text Add to dashboard Cite

show abstract

“…Their approach involves measurement of a stress vs. strain curve during this cycle, and the results are interpreted in terms of aspects of the energy of separation and a modulus during separation, which is then used as an index of tack. Seferis has further developed the analysis in other publications [25].…”

Section: Measurement Of Pre-preg Tackmentioning

confidence: 99%

Future requirements in the characterization of continuous fiber-reinforced polymeric composites (IUPAC Technical Report)

Moore

Červenka

2002

Pure and Applied Chemistry

View full text Add to dashboard Cite

“…Air permeability defines inter-and/or intra-pores inside the prepreg stack which provide efficient channels for gas venting off. As to quantify air permeability of prepreg, Seferis et al [15][16][17] installed the air permeation equipments in autoclave environment, and the inplane air permeability was obtained based on fallingpressure and steady-pressure methods. Tavares and colleagues 18,19 developed an experimental method to determine the through-thickness air permeability during cure of prepreg stack, and it was used as a tool to optimize sandwich manufacturing techniques.…”

Section: Introductionmentioning

confidence: 99%

Measurement and analysis on in-plane and through-thickness air permeation of fiber/resin prepreg

Xin

et al. 2011

Journal of Reinforced Plastics and Composites

View full text Add to dashboard Cite

Nowadays, zero-bleeding process and out-of-autoclave process are prevailing for aircraft composite structures. For these cases, the prepreg property such as air permeability becomes a crucial element for entrapped air venting off from prepreg stack during cure process. Therefore, the measurement of air permeability is important for the understanding and optimization of autoclave and vacuum-bag processes to obtain void-free composite parts. In this paper, an air permeation measuring system was established to test in-plane and through-thickness air permeabilities of prepreg stack, and the effects of compacting pressure and temperature on the air permeability were investigated. Furthermore, the influences of air permeability of prepreg stack on the void characteristics inside the cured laminates processed by autoclave and vacuum-bag processes were analyzed. The results indicate that the proposed air permeation measuring systems can quantitatively measure the in-plane and through-thickness gas permeabilities of prepreg stack. The compacting pressure and temperature have important effects on air permeability. For the same prepreg system, the in-plane air permeability is two orders of magnitudes higher than the through-thickness one. Finally, void defects are sensitive to the air permeability for vacuum-bag process, especially in the case of thick laminates. It provides an effective way to evaluate the quality of the prepreg for control of void defect and an important guideline for prepreg manufacturers.

show abstract

George Seferis

Cited by 13 publications

References 0 publications

Novel way of making high refractive index plastics; metal containing polymers for optical applications

Novel way of making high refractive index plastics; metal containing polymers for optical applications

Future requirements in the characterization of continuous fiber-reinforced polymeric composites (IUPAC Technical Report)

Measurement and analysis on in-plane and through-thickness air permeation of fiber/resin prepreg

Contact Info

Product

Resources

About