Blisters

About: Blisters is a research topic. Over the lifetime, 980 publications have been published within this topic receiving 16229 citations.

Study of adherence loss for paint films coated onto polymeric substrates by induced blistering

Abstract: A paint coated onto polymeric materials does not blister necessarily. This phenomenon is produced by humidity during natural and accelerated ageing and appears in the form of blisters of various sizes and densities. The substrate studied is polyamide 66. Polyurethane and polyacrylic paints were used. The study involved microanalytical and microstructural techniques (scanning electron microscopy, infrared spectroscopy) as well as macroscopic techniques (water analysis, gravimetry, porosimetry, three-point bend test). Blisters result essentially from organic residues which originate from the substrate and migrate to the paint/substrate interface via an osmotic mechanism as the substrate becomes saturated with water. This study deals with variations of polymer substrate fabrication. Performance improvements can be realized by lowering the amount of mineral fillers in the polymer substrate, by increasing the substrate thickness, and by increasing the mould temperature.

Erosion resistance of different types of beryllium to the plasma impact

Abstract: The comparative study of morfology change of different kinds of beryllium after being subjected to the periphery plasma (nc ≤ 1013 cm−3, Te. ≃ 15 eV) of a pulse reflex discharge is carried out. It was shown that the probability of arcing is much lower for samples made of ingot as compared to samples made of the hot pressed beryllium. The latter samples differ also by high number of blisters that can be divided in two groups: every large blister with a doubled boundary (the mean diameter size is D = 0.8 μm) has a pore, and small blisters (D -0.3 μm) have no pores at all.

Effect of Film Thickness on Coated Film Degradation by Scanning Acoustic Microscope and Nanoindentation Tester

Abstract: The effect of film thickness from 33 to 211 μm on the degradation of pigmented long oil alkyd resin paint film coated on a steel plate in a 3% NaCI solution was investigated by use of a scanning acoustic microscope (SAM) and a nanoindentation tester. The growth speed and progress pattern of blisters observed by SAM were classified as three types. In the case of a type A blister, at first a lower Young's modulus (E) area generated partially, a lot of fine blisters initiated in the area at the initial stage that connected with each other and became large. In the case of a type B blister, the initiation time of blistering was long, and the blisters grew rapidly and became large once they appeared. In the case of a type C blister, the initiation time of blistering was long, and blisters grew slowly if they appeared. The blister of 33 μm film showed type A, the blister of 47 μm film showed type A or type B, the blisters of 119, 154, and 211 mm film showed type B and/or type C blistering. Furthermore, type A initiated before the immersion time of maximum E peak value (T EP ), and type B and type C initiated after T EP .

Sudden onset of generalized blisters.

Abstract: An 86-year-old man presented with painful generalized bullous eruptions. His medical history was unremarkable and he was not taking regular medications. The lesions appeared approximately 8 hours after taking two 25-mg doses of diclofenac, which was prescribed for low back pain. He initially noticed itching over both hands and feet, followed by a burning sensation and the subsequent development of generalized purplish lesions. He reported history of a similar though less severe eruption 4 months earlier at similar sites following diclofenac ingestion. A clinical examination revealed multiple well-circumscribed, round to oval, purplish patches, erosions, and blisters on his trunk and feet (Figure). Crusting over the lips and dusky red erosions and plaques on the penis, scrotum, and lower limbs were also noted (Figure). He denied fever or other constitutional symptoms. Quiz at jama.com Figure. Lesions observed on patient.

Multiple itchy blisters and painful erosions on the hands.

Abstract: A 52-year-old man was referred to us for recurrent, itchy blisters and painful erosions localized on his hands. He worked as an administrative employee in a company. Comorbidities included hypertension, type 2 diabetes and hepatic steatosis. In addition, the patient was under immunosuppressive therapy with cyclosporine (2 mg/kg/day) and prednisone (25 mg/ day); this started after a heart transplantation performed eight years before. The lesions appeared during summer and persisted despite application of topical corticosteroids and barrier creams. Patch tests with common contact allergens were negative. Physical examination revealed multiple tense vesiculobullae of variable sizes (0.7–3.0 cm in diameter) and erosions on both hands. The lesions involved the palms, interdigital webs and dorsal aspects of the hands (Figure 1). The mucosae and other skin areas were spared. Two punch biopsies were taken from the border of a blister and from perilesional skin for histopathological and direct immunofluorescence examination, respectively. Multiple itchy blisters and painful erosions on the hands Case for Diagnosis