13. Mass Variation Rate, in Acidic Environment, of Polyhydroxybutyrate and Chitosan matrices with Potential Application as Controlled Drug Delivery System

Polymers such as the biocompatible polyhydroxybutyrate (PHB) and the polysaccharide chitosan (Chi), a pH-sensitive polymer, have been studied for drug delivery applications and scaffolds production. In this work, matrices of PHB and Chi were produced by compression molding (SPHB-Chi) and loaded with a broad-spectrum biocide chlorhexidine (CHX) (SPHB-Chi-CHX)

Mat. Res.. Publicado em: 30/09/2019

14. Development and in vitro/in vivo evaluation of thermo-sensitive in situ gelling systems for ocular allergy

Ocular allergy is one of the most common disorders of the eye surface. Following diagnosis this condition is typically treated with preparations containing antihistamines. However, anatomy of the eye and its natural protective mechanisms create challenges for ocular drug delivery. Rapid elimination of antihistamine substances due to short residency times fol

Braz. J. Pharm. Sci.. Publicado em: 23/09/2019

15. Influence of coupling agents on the adhesion force of dissimilar overmolded polymers: a digital image correlation analysis

ABSTRACT The increase in the technical and functional requirements of plastic items has led the development of multimaterials. To achieve a good performance in the adhesion of dissimilar materials, in this case, polypropylene and coconut fiber composites, it is fundamental to understand the phenomena related to the specific interface. This work aims to evalu

Matéria (Rio J.). Publicado em: 16/09/2019

16. Stabilization effect of kraft lignin into PBAT:Thermal analyses approach

ABSTRACT Sterically hindered phenols are an important class of synthetic antioxidants for polymers, commonly incorporated to inhibit polyolefins or polyesters oxidation. However, synthetic antioxidants use is under restricted regulation due to their potential health risk and environmental impacts. Thus, great interest has been attracted to the phenol-based n

Matéria (Rio J.). Publicado em: 16/09/2019

17. Adding value to polystyrene waste by chemically transforming it into sulfonated polystyrene

ABSTRACT Polystyrene (PS), one of the most used polymers in everyday life, has a low recycling rate due to its inexpensive virgin resin. In order to make polystyrene waste (WPS) recycling advantageous, it is possible to change it chemically, introducing heteroatoms in the polymer chain thus transforming the waste into a material with more added value. In thi

Matéria (Rio J.). Publicado em: 16/09/2019

18. The role of bondline thickness on mechanical properties of bio-based polyurethane

ABSTRACT Bio-based adhesives have been largely applied on several applications in many industrial areas, including automotive and laminated food packaging. Polyurethanes (PU) occupy a leading position among the most used bio-based polymers due to their large range of properties and application versatility. Recent works reported that PU obtained from castor o

Matéria (Rio J.). Publicado em: 16/09/2019

19. Avaliação do efeito do agente compatibilizante (PP-g-MA) em misturas PP/Amido termoplástico

RESUMO O crescente desperdício de materiais plásticos no meio ambiente juntamente com a preocupação com a futura escassez do petróleo tem aumentado o interesse por polímeros biodegradáveis, como o amido. Nos últimos anos, o amido tem sido utilizado em misturas com diferentes polímeros sintéticos. Essas misturas têm sido compatibilizadas por meio d

Matéria (Rio J.). Publicado em: 16/09/2019

20. Estudo da substituição do nylon por compósito de polipropileno com fibra de vidro

RESUMO Peças fabricadas com polímeros de alto desempenho têm sido substituídas por materiais similares, sendo produzidas com uma composição de polipropileno (PP), que tem um custo mais baixo. Uma das composições mais comumente utilizadas é a junção do polipropileno com fibras, resultando na formação de um novo material, com características dife

Matéria (Rio J.). Publicado em: 16/09/2019

21. Avaliação morfológica de fibras eletrofiadas de policaprolactona em função do tipo de solvente

RESUMO Recentemente, estratégias da engenharia tecidual para o tratamento de feridas e queimaduras prevê o uso de biomateriais nanoestruturados capazes de facilitar a regeneração da pele e a cura das feridas. Um dos processos utilizados para a obtenção deste tipo de biomaterial é a eletrofiação. Por meio deste processo é possível formar filmes com

Matéria (Rio J.). Publicado em: 16/09/2019

22. Desenvolvimento e caracterização de membranas de quitosana / Cissus Verticillata (L.) Nicolson & C.E. Jarvis

RESUMO Os polímeros, devido às suas diversas aplicações e funcionalidades, estão entre os excipientes mais utilizados para a obtenção de formas farmacêuticas, ganhando destaque a quitosana. O objetivo deste trabalho foi desenvolver e avaliar comparativamente membranas de quitosana com diferentes concentrações da espécie vegetal Cissus verticillata

Matéria (Rio J.). Publicado em: 16/09/2019

23. Synthesis and Characterization of Modified Polystyrene with Oleic Acid and an Allyl Ester Derivative

Polystyrene (PS) is one of the most widely used polymers in the world, having a wide applicability. PS can be used in pure or modified forms, and the commercial materials most used for modifications are non-renewable and have high costs. For this reason, studies have been carried in order to evaluate renewable components application such as vegetable oils, f

Mat. Res.. Publicado em: 05/09/2019

24. Numerical Simulation of Atom-Transfer Radical Polymerization of tert-butyl Methacrylate

Block copolymers based on tert-butyl methacrylate (tBMA) have many uses, such as thermo‐responsive polymers, amphiphilic copolymers, and many applications in the medical field. Atom-transfer radical polymerization (ATRP) is the main technique to produce these controlled macromolecular architectures. This paper provides a simplified kinetic modeling and com

Mat. Res.. Publicado em: 02/09/2019