Silicone rubber-hydrogel composites as polymeric biomaterials IX. Composites containing powdery polyacrylamide hydrogel

Hron, Petr; Šlechtová, Jaroslava; Smetana, Karel; Dvořánková, Barbora; Lopour, P.

doi:10.1016/s0142-9612(97)00039-2

Cited by 34 publications

(20 citation statements)

References 8 publications

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“…Silicone rubber has been prepared by anionic copolymerization 6) of 500 g octamethylcyclotetrasiloxane with 1 g of 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasiloxane, 1.36 g of potassium hydroxide dispersion in octamethylcyclotetrasiloxane (concentration 0.0015 wt.-% KOH, Lučební závody Kolín) as an initiator, and 0.25 g of decamethyltetrasiloxane (purity 97.6 wt.-%, Lučební závody Kolín) as a transferring agent. Before the beginning of the polymerization, the reaction mixture had been purged with nitrogen.…”

Section: Chemicals Rubber and Hydrogelmentioning

confidence: 99%

“…Polymerization was carried out in a stirred glass kettle (800 mL, 45 rpm) at 170 . Slightly crosslinked polyacrylamide has been synthesized by the radical precipitation copolymerization 6) of 122 g acrylamide (Fluka AG, Switzerland, purum) with 5.7 g of N,N'-methylenebisacrylamide (Fluka AG, Switzerland, used without purification), and 1.85 g of 2,29-azoisobutyronitrile as initiator in acetone (1750 mL). Polymerization was performed at 60 8 C in a 3 L stirred autoclave equipped with a duplicator, and a U-shaped mixing blade.…”

Section: Chemicals Rubber and Hydrogelmentioning

confidence: 99%

“…After 4 h, the reaction had been essentially complete. Powdery polyacrylamide hydrogel was filtered off from the slurry obtained, thoroughly washed with acetone, and dried in vacuo (60 8 C, 0.5 kPa) 6) . The specific surface area of the powdery polymer was 72 m 2 g - 1 6) .…”

Section: Chemicals Rubber and Hydrogelmentioning

confidence: 99%

“…The specific surface area of the powdery polymer was 72 m 2 g - 1 6) . The content of extractable compounds was determined as 0.089 wt.-% 6) .…”

Section: Chemicals Rubber and Hydrogelmentioning

confidence: 99%

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Shape memory of composites based on silicone rubber and polyacrylamide hydrogel

Hron¹,

Šlechtová

1999

Angew. Makromol. Chem.

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The shape memory of hydrophilic composite materials based on silicone rubber and slightly crosslinked polyacrylamide, which is a non‐ionic hydrogel, has been studied. Before the shape memory testing, it was necessary to determine the glass transition temperature (Tg) of the slightly crosslinked polyacrylamide as well as the mechanical properties of the composites at temperatures above Tg of a crosslinked polyacrylamide. Afterwards, the shape memory of the composite material was tested by performing a set of simple experiments based on deformation and heating of test pieces, their subsequent cooling and deformation force removing, and their repeated heating or water swelling, during which the residual elongation was measured and calculated. The composite material shaped in this way resumes its original shape if it is again heated above Tg of the crosslinked polyacrylamide or allowed to swell in distilled water. There exists a limiting concentration of hydrogel phase (approx. 30 phr), which is limited by good dispersion and good contact of hydrogel particles within the silicone matrix, under which the shape memory does not occur, and above which it exists.

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Section: Chemicals Rubber and Hydrogelmentioning

confidence: 99%

Section: Chemicals Rubber and Hydrogelmentioning

confidence: 99%

Section: Chemicals Rubber and Hydrogelmentioning

confidence: 99%

“…The specific surface area of the powdery polymer was 72 m 2 g - 1 6) . The content of extractable compounds was determined as 0.089 wt.-% 6) .…”

Section: Chemicals Rubber and Hydrogelmentioning

confidence: 99%

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Shape memory of composites based on silicone rubber and polyacrylamide hydrogel

Hron¹,

Šlechtová

1999

Angew. Makromol. Chem.

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“…These are high temperatures specific to sterilization, used to make products for the food, pharmaceutical and medical industries. Items made of silicone elastomers (silicone rubber) are preferred in medicine because they do not contain substances such as antioxidants and other restricted ingredients [9][10][11][12]. This paper presents the development of polymer nanocompounds based on silicone rubber, reinforced with TiO 2 nanoparticles filled with chalk (CaCO 3 ), with stearin as plasticizer and crosslinked with dicumyl peroxide (PD), which were characterized in terms of physicomechanical and chemical properties by immersion in specific environments for the pharmaceutical and food industries (alcohol, distilled water, cooking oil -sunflower oil) according to standards in force and structurally analysed by FT-IR.…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Nanocompound Based on Silicone Rubber. Part I – Obtaining and Characterisation

Niţuică¹,

Sönmez²,

Georgescu³

et al. 2017

LFJ

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ABSTRACT. The purpose of this paper is to develop an antibacterial polymer nanocompound based on silicone rubber reinforced with TiO 2 nanoparticles and with added crosslinkers -dicumyl peroxide. The antibacterial nanocompound polymer was developed by vulcanization on a laboratory roll mill, so as to be further processed by means of molding using the electric press, with preset parameters for optimum processing. The antibacterial polymer nanocompound obtained was characterized in terms of physical-mechanical properties in normal condition and after accelerated aging at 70°C for 168 hours; it was also characterized in terms of immersion in specific environments for the food and pharmaceutical industries according to standards in force, and structurally by FT-IR. The new advanced material based on silicone elastomer (silicone rubber) helps to improve product quality, protects human health, sterilizes products against bacteria and microbes and last but not least protects the environment, but also increases the turnover of domestic and international companies. Following physical-mechanical and chemical characterization of polymer nanocompounds, two variants were selected (P 5 and P 6 ) which have potential applications in food and pharmaceutical industries. KEY WORDS: silicone rubber, polymer nanocompound, vulcanization, antibacterial nanocompound NANOCOMPOUND ANTIBACTERIAN PE BAZĂ DE CAUCIUC SILICONIC. PARTEA I -OBŢINERE ŞI CARACTERIZAREREZUMAT. Scopul acestei lucrări este obţinerea unui nanocompound polimeric antibacterian pe bază de cauciuc siliconic, ranforsat cu nanoparticule de TiO 2 şi adaosuri de agenţi de reticulare -peroxid de dicumil. Nanocompoundul polimeric antibacterian s-a realizat prin vulcanizare pe un valţ de laborator, astfel încât să poată fi prelucrat prin metode de formare (în matriţă) în presa electrică, la parametri de procesare optimi prestabiliţi. Nanocompoundul polimeric antibacterian obţinut a fost caracterizat din punct de vedere fizico-mecanic în stare normală şi după îmbătrânire accelerată la temperatura de 70°C, timp de 168 h; din punct de vedere al imersiei în medii specifice domeniilor alimentar şi farmaceutic, conform standardelor în vigoare; şi structural prin spectroscopie FT-IR. Noul material avansat, pe bază de elastomer siliconic (cauciuc siliconic), contribuie la îmbunătăţirea calităţii produselor, protecţiei sănătăţii omului, sterilizarea antibacteriană şi antimicrobiană a produselor obţinute şi nu în ultimul rând la protecţia mediului, dar şi la creşterea cifrei de afaceri a agenţilor economici autohtoni şi internaţionali. În urma caracterizării fizico-mecanice şi chimice a nanocompoundurilor polimerice obţinute, s-au selectat două variante de nanocompounduri (P 5 şi P 6 ) ce au potenţiale aplicaţii în industria alimentară şi farmaceutică. CUVINTE CHEIE: cauciuc siliconic, nanocompound polimeric, vulcanizare, nanocompound antibacterian NANOCOMPOSITE ANTIBACTÉRIEN À BASE DE CAOUTCHOUC DE SILICONE. PARTIE I -OBTENTION ET CARACTÉRISATIONRÉSUMÉ. Le but de cet article est d'obte...

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Structure Properties Interrelations of Silicones for Optimal Design in Biomedical Prostheses

Tarantili

2014

Concise Encyclopedia of High Performance Silicones

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Silicone rubber-hydrogel composites as polymeric biomaterials IX. Composites containing powdery polyacrylamide hydrogel

Cited by 34 publications

References 8 publications

Shape memory of composites based on silicone rubber and polyacrylamide hydrogel

Shape memory of composites based on silicone rubber and polyacrylamide hydrogel

Antibacterial Nanocompound Based on Silicone Rubber. Part I – Obtaining and Characterisation

Structure Properties Interrelations of Silicones for Optimal Design in Biomedical Prostheses

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