Synthesis and characterization of acrylic‐based superabsorbents

Askari, Fahimeh; Nafisi, S.; Omidian, Hossein; Hashemi, Seyed Ali

doi:10.1002/app.1993.070501022

Cited by 75 publications

(29 citation statements)

References 2 publications

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“…Termodinamicamente, a dispersão é instável e requer contínua agitação e adição de agentes estabilizantes. A iniciação geralmente é feita termicamente ou quimicamente, com um radical livre de um azocomposto ou percomposto [2,9,10] . No caso do uso de um único componente iniciador, a polimerização pode ser iniciada pela decomposição do iniciador na fase orgânica, na fase aquosa ou em ambas as fases, dependendo da partição do iniciador nas duas fases.…”

Section: Polimerização Inversaunclassified

Uma revisão sobre os processos de polimerização em suspensão

2007

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Resumo: Inúmeros processos podem ser utilizados para produção de materiais poliméricos. Cada processo apresenta características peculiares, que permitem produzir resinas com as mais variadas propriedades, visando a diferentes aplicações do material polimérico final. Os processos de polimerização em suspensão são bastante empregados para produção de resinas poliméricas por apresentarem muitas vantagens, como a facilidade de separação, fácil remoção de calor e controle de temperatura e, principalmente, pelos baixos níveis de impureza e de aditivação no produto final. Por isso, processos de polimerização em suspensão são apropriados para obtenção de produtos para aplicações biotecnológicas e médicas, dentre outras. O objetivo principal deste trabalho é apresentar uma discussão dos aspectos fundamentais inerentes aos processos de polimerização em suspensão, visando a uma compreensão do efeito das principais variáveis de processo sobre o desempenho de polimerizações em suspensão. Mostra-se também que a espectroscopia do infravermelho próximo (NIRS) pode ser muito útil para permitir o monitoramento e o controle em tempo real de processos de polimerização em suspensão, para a obtenção de materiais poliméricos com características especiais. Palavras-chave: Polimerização, suspensão, espectroscopia, infravermelho próximo. A Review on Suspension Polymerization ProcessesAbstract: Several processes can be employed for manufacturing polymer materials. Each process presents some intrinsic features that lead to production of resins with peculiar properties, which define the end-use application of the final polymeric material. Suspension polymerization processes are extensively used because of their many advantages, such as the easy separation of the polymer particles, easy removal of the heat of reaction, easy temperature control and low levels of impurities and additives in the final polymer material. For this reason, suspension polymerization processes are suitable to produce polymer resins for biotechnological and medical applications. The main objective of this work is to discuss the fundamental aspects of suspension polymerization processes, focusing upon the effects of the main process variables on the performance of suspension polymerizations. Additionally, it is shown that near infrared spectroscopy (NIRS) can be useful for monitoring and real time control of suspension processes, allowing for production of polymer beads with controlled morphology.

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Section: Polimerização Inversaunclassified

Uma revisão sobre os processos de polimerização em suspensão

2007

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“…HSHs with tailor-made properties can be achieved by changing the polymerization method, such as, solution or reverse dispersion polymerizations. For example, an inverse suspension polymerization can be utilized to prepare particulate HSHs with narrow or wide particle size distributions [4,5]. Higher molecular weight polymers provide better hydrogels swelling and mechanical properties.…”

Section: Engineered Hydrogelsmentioning

confidence: 99%

Engineered High Swelling Hydrogels

Omidian

Park

2010

Biomedical Applications of Hydrogels Handbook

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High swelling hydrogels (HSHs) are materials with the ability to swell to a large size in an aqueous medium. The swelling feature and mechanical properties of the HSH polymers depend on many factors. Therefore, the HSH properties can be engineered to tailor a hydrogels for a specific application. This chapter begins with the HSH anatomy and its engineering aspects, and continues with the purity of hydrogels and the sources of impurities in HSH polymers. The characterization of HSH polymers includes swelling determination, mechanical properties, and analytical issues, which will be discussed with a focus on both practical and theoretical aspects. Since final hydrogels properties are closely related to the level of its stability, this aspect is discussed by explaining the sources of instability, which potentially threaten the hydrogels properties. The chapter ends with two important groups of hydrogels that have been suggested and engineered for specific applications in pharmaceutical area.

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“…The particle size distribution of above sample was determined according to the literature, 16 and the results were as follows: <50 mesh, 0 wt %; 50-80 meshes, 28 wt %; 80-120 meshes, 50 wt %; 120-150 meshes, 21.6 wt %; >150 mesh, <0.4 wt %.…”

Section: Determination Of Particle Size Distributionmentioning

confidence: 99%

Preparation and adsorption selectivity of rutin molecularly imprinted polymers

Chen

et al. 2011

J of Applied Polymer Sci

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Molecularly imprinted polymer (MIP) for Rutin had been prepared through solution polymerization by redox initiation. The effects of monomers, crosslinker, initiators, polymerization time, and temperature on adsorption selectivity for Rutin were investigated and optimized. The structure and surface morphology of MIP were evaluated by Fourier transform infrared spectroscopy and scanning electron microscopy, respectively. The synthesized MIP under the optimal conditions showed a specific recognition of Rutin from the mixture of Rutin and Isorhamnetin. And the maximal separation degree of Rutin was 5.0. V C 2011 Wiley Periodicals, Inc. J Appl Polym Sci 123: [903][904][905][906][907][908][909][910][911][912] 2012

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Synthesis and characterization of acrylic‐based superabsorbents

Cited by 75 publications

References 2 publications

Uma revisão sobre os processos de polimerização em suspensão

Uma revisão sobre os processos de polimerização em suspensão

Engineered High Swelling Hydrogels

Preparation and adsorption selectivity of rutin molecularly imprinted polymers

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