Results 1 to 10 of about 1,128 (134)
Polymer Testing, 2021 Nitrocellulose (NC) is a polymer of great interest in the aerospace and paint/coating fields. However, there are gaps regarding quantitative analysis. Fast and accurate methodologies for the quality control of raw materials are limited. In this context, the determination of the nitrogen content in NC and the contents of different acrylic/styrene ...
Milton Faria Diniz
exaly +4 more sources
Quantification by FT-IR (UATR/NIRA) of NBR/SBR blends [PDF]
Polimeros, 2018 Abstract Rubber blends are important materials in automotive industry, as well as in other sectors. However, there are implications when suitable use of a polymer in an artifact is not made. In the automotive area, for example, the use of an elastomer without the fuel resistance requirement would result in component degradation, potential fuel leakage,
Lidia Mattos Silva Murakami +2 more
exaly +6 more sources
Characterization of additives in NR formulations by TLC-IR (UATR) [PDF]
Polimeros, 2018 Abstract It is a well-established fact that rubber accelerator is essential to provide solution in different sectors. However, there is a reversal process which can reduce the material performance. Sulfur accelerators donors and organic peroxides have been presented as a solution to the problem.
Lidia Mattos Silva Murakami +2 more
exaly +5 more sources
UATR and NIRA evaluation in the quantification of ATBC in NC blends [PDF]
Polimeros, 2018 Abstract The paint industry requires rapid and accurate methodologies of raw materials qualitiy controls. For example, the evaluation of the suitable ratio of binary mixtures of polymer/plasticizer such as nitrocellulose (NC)/acetyl tributyl citrate (ATBC) must be done, since this ratio is directly related to the performance of the final product ...
Milton Faria Diniz +2 more
exaly +5 more sources
FT-IR methodology (transmission and UATR) to quantify automotive systems [PDF]
Polimeros, 2018 Abstract When using Fourier transform infrared spectroscopy (FT-IR) under the qualitative aspect for characterization of polymer blends, often a simple identification of each one of the existing polymers in the blend does not justify the material failure since different amounts of each component may result in different mechanical properties, which ...
Milton Faria Diniz +2 more
exaly +5 more sources
Separação e identificação de aditivos em tinta por TLC-IR/ UATR e extração seletiva [PDF]
Polimeros, 2016 Resumo Vários aditivos são incorporados nas formulações de tintas para evitar defeitos no revestimento e melhorar o desempenho nas aplicações, constituindo, desse modo, um sistema complexo. A caracterização de uma composição pode ser realizada por separações física/ química e técnicas analíticas instrumentais.
Milton Faria Diniz +2 more
exaly +5 more sources
TLC/IR (UATR) off-line coupling for the characterization of additives in EPDM rubber compositions [PDF]
Polimeros, 2016 Abstract The knowledge of the components that constitutes a rubber composition is important to justify the properties of the final device, particularly when it comes to elastomeric compositions used in the aerospace industry. The development of methodologies that can detect components, specially the smallest proportion of the rubbers composition is a ...
Milton Faria Diniz +2 more
exaly +5 more sources
Evaluation of hydrogel use in the development of Rapanea ferruginea with water restriction by vibrational Fourier Transform Infrared Spectroscopy (FTIR-UATR) [PDF]
Revista Ambiente & Água, 2021 This study evaluated the use of hydrogel on the development of Rapanea ferruginea under water restriction through Vibrational Fourier Transform Infrared Spectroscopy (FTIR-UATR). Seedlings of approximately 30 cm height were transferred in pots with 3 L of soil. The group of seedlings was separated into 5 different triplicate treatments according to the
Douglas Cubas Pereira +2 more
exaly +5 more sources
FT-IR/UATR and FT-IR transmission quantitative analysis of PBT/PC blends
Polymer Testing, 2020 Abstract Polymer blends are produced to achieve properties that pure polymers are unable to. The qualitative analysis of these blends is not always satisfactory to point out failures in the final product and, therefore, the determination of their content might be required.
Milton Faria Diniz +1 more
exaly +2 more sources
Off-line TLC-IR (UATR) characterization of additives in EPDM rubber
Polymer Testing, 2019 Abstract Sulfur donor accelerators and vulcanization agents, such as peroxides, due to their chemical characteristics and good thermal stability properties in rubber formulations, are essential to provide solutions in different sectors, such as aerospace and automotive, since they reduce the polymer degradation process (reversal), which can influence
Lidia Mattos Silva Murakami +1 more
exaly +2 more sources