Synthetic Polymers
Mostrando 13-24 de 152 artigos, teses e dissertações.
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13. Cholesterol improves the transfection efficiency of polyallylamine as a non-viral gene delivery vector
ABSTRACT Cationic polymers such as polyallylamine (PAA) having primary amino groups are poor transfection agents and possess a high cytotoxicity index when used without any chemical modification. In this study, PAA was modified with cholesterol in order to improve transfection efficiency and to reduce cytotoxicity. PAA polymers with molecular weights of 15 a
Braz. J. Pharm. Sci.. Publicado em: 26/10/2017
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14. The influence of natural clay and organoclay vermiculite on the formation process of bionanocomposites with poly (3-hydroxybutyrate-co-3-hydroxyvalerate)
ABSTRACT During the last decades, a lot of research work focused on several biodegradable and biosourced polyesters for the purpose of reducing the non-degradable polymer wastes. These polyesters are particularly considered to be promising polymers for biomedical applications and short life-time products like packaging. As these packagings are rapidly discar
Matéria (Rio J.). Publicado em: 02/10/2017
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15. Sialendoscopy Training: Presentation of a Realistic Model
Abstract Introduction Several surgical training simulators have been created for residents and young surgeons to gain experience with surgical procedures. Laboratory training is fundamental for acquiring familiarity with the techniques of surgery and skill in handing instruments. Objective The aim of this study is to present a novel simulator for trainin
Int. Arch. Otorhinolaryngol.. Publicado em: 2017-03
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16. FILMES BIODEGRADÁVEIS DE AMIDO DE MANDIOCA, PULULANA E CELULOSE BACTERIANA
The largest consumption of plastics in the world is referred to the synthetic polymers, which are not biodegradable and have a non-renewable source, generating a large environmental impact, especially in urban centers. As a result, in the last two decades several polymers obtained from renewable sources (biopolymers) have been studied as potential raw materi
Quím. Nova. Publicado em: 2016-11
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17. Dispersion degree and zeta potential of hematite
Abstract The dispersion degree of the mineral particles in the pulp is especially relevant regarding the performance of the cationic reverse flotation of iron ores. The gangue minerals should remain dispersed while hematite particles should be selectively flocculated. The present study addressed determinations of dispersion degree and zeta potential of hemat
Rem: Rev. Esc. Minas. Publicado em: 2016-06
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18. Eco-Friendly Luminescent Hybrid Materials Based on EuIII and LiI Co-Doped Chitosan
Biopolymer-based materials have been of particular interest as alternatives to synthetic polymers due to their low toxicity, biodegradability and biocompatibility. Among them, chitosan is one of the most studied ones and has recently been investigated for the application as solid state polymer electrolytes. Furthermore, it can serve as a host for luminescent
J. Braz. Chem. Soc.. Publicado em: 2015-12
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19. BIOMATERIAIS: TIPOS, APLICAÇÕES E MERCADO
AbstractThe types of compounds used in the production of biomaterials, namely metals, ceramics, synthetic and natural polymers, as well as composite materials, are discussed in the present work, together with details of their application and evolution from biocompatible to bioactive, biodegradable, and biomimetic clinical products. The chemical structure, th
Quím. Nova. Publicado em: 2015-08
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20. Development of dual-sensitive smart polymers by grafting chitosan with poly (
N -isopropylacrylamide): an overviewAbstract A great deal of research on polymers over the past two decades has been focused on the development of stimuli-responsive polymers to obtain materials able to respond to specific surroundings. In this paper, an overview is presented of the concepts, behavior and applicability of these “smart polymers”. Polymers that are temperatu
Polímeros. Publicado em: 2015-06
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21. The effect of di-(-2-ethyl hexyl) phthalate (Dehp) as plasticizer on the thermal and mechanical properties of pvc/pmma blends
Plasticizers play a key role in the formulation of polymers and in determining their physical properties and processability. This study examines the effect of di(2-ethyl hexyl)phthalate (DEHP) as plasticizer on the thermal and mechanical properties of PVC/PMMA blends. For that purpose, blends of variable composition, from 0 to 100 wt%, were prepared in the p
Polímeros. Publicado em: 2014-08
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22. Evaluation of decomposition kinetics of poly (ether-ether-ketone) by thermogravimetric analysis
The non-isothermal thermogravimetric methods have been used extensively for the determination of kinetic parameters in polymers. The poly (ether ketones) are used as matrix in advanced high performance composites due its high thermal stability, excellent environmental performance and superior mechanical properties. In this work, the non-isothermal decomposit
Mat. Res.. Publicado em: 17/12/2013
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23. Degradation of non-vulcanized natural rubber - renewable resource for fine chemicals used in polymer synthesis
In the current scenario, there is growing interest in the products of degradation of rubber (natural and synthetic) for specific applications in different industry sectors, whose benefits in replacing conventionally used products are mainly related to sustainability. Since the degradation products of rubber can be used in different areas, several research gr
Polímeros. Publicado em: 20/08/2013
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24. Polímeros impressos com íons: fundamentos, estratégias de preparo e aplicações em química analítica
Chemical imprinting technology has been widely used as a valuable tool in selective recognition of a given target analyte (molecule or metal ion), yielding a notable advance in the development of new analytical protocols. Since their discovery, molecularly imprinted polymers (MIPs) have been extensively studied with excellent reviews published. However, stud
Quím. Nova. Publicado em: 2013