Preparation, characterization and gas separation properties of nanocomposite materials based on novel silane functionalizing polyimide bearing pendent naphthyl units and ZnO nanoparticles

RSC Advances ◽  
2015 ◽  
Vol 5 (12) ◽  
pp. 8630-8639 ◽  
Author(s):  
Mohammad Dinari ◽  
Hashem Ahmadizadegan
Keyword(s):  
Mechanical Properties ◽  
Gas Separation ◽  
Zno Nanoparticles ◽  
Nanocomposite Materials ◽  
Thermal And Mechanical Properties ◽  
End Group

Nanocomposites of polyimide with silane end group and ZnO nanoparticles with good thermal and mechanical properties were prepared and were used for gas separation.

scholarly journals Progress in Biodegradable Flame Retardant Nano-Biocomposites

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 741
Author(s):  
Zorana Kovačević ◽  
Sandra Flinčec Grgac ◽  
Sandra Bischof
Keyword(s):  
Mechanical Properties ◽  
Flame Retardant ◽  
Flame Retardancy ◽  
Circular Economy ◽  
Nanocomposite Materials ◽  
Thermal And Mechanical Properties ◽  
Specific Group ◽  
New Class ◽  
Research Initiatives ◽  
Positive Properties

This paper summarizes the results obtained in the course of the development of a specific group of biocomposites with high functionality of flame retardancy, which are environmentally acceptable at the same time. Conventional biocomposites have to be altered through different modifications, to be able to respond to the stringent standards and environmental requests of the circular economy. The most commonly produced types of biocomposites are those composed of a biodegradable PLA matrix and plant bast fibres. Despite of numerous positive properties of natural fibres, flammability of plant fibres is one of the most pronounced drawbacks for their wider usage in biocomposites production. Most recent novelties regarding the flame retardancy of nanocomposites are presented, with the accent on the agents of nanosize (nanofillers), which have been chosen as they have low or non-toxic environmental impact, but still offer enhanced flame retardant (FR) properties. The importance of a nanofiller’s geometry and shape (e.g., nanodispersion of nanoclay) and increase in polymer viscosity, on flame retardancy has been stressed. Although metal oxydes are considered the most commonly used nanofillers there are numerous other possibilities presented within the paper. Combinations of clay based nanofillers with other nanosized or microsized FR agents can significantly improve the thermal stability and FR properties of nanocomposite materials. Further research is still needed on optimizing the parameters of FR compounds to meet numerous requirements, from the improvement of thermal and mechanical properties to the biodegradability of the composite products. Presented research initiatives provide genuine new opportunities for manufacturers, consumers and society as a whole to create a new class of bionanocomposite materials with added benefits of environmental improvement.

scholarly journals A systematic study of the effect of the hard end-group composition on the microphase separation, thermal and mechanical properties of supramolecular polyurethanes

Polymer ◽  
2016 ◽  
Vol 107 ◽  
pp. 368-378 ◽  
Author(s):  
Daniel Hermida Merino ◽  
Antonio Feula ◽  
Kelly Melia ◽  
Andrew T. Slark ◽  
Ioannis Giannakopoulos ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Systematic Study ◽  
Group Composition ◽  
Microphase Separation ◽  
Thermal And Mechanical Properties ◽  
End Group

scholarly journals Tailoring the Thermal and Mechanical Properties of PolyActiveTM Poly(Ether-Ester) Multiblock Copolymers Via Blending with CO2-Phylic Ionic Liquid

Polymers ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 890 ◽  
Author(s):  
Martina Klepić ◽  
Alessio Fuoco ◽  
Marcello Monteleone ◽  
Elisa Esposito ◽  
Karel Friess ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Gas Separation ◽  
Thermal And Mechanical Properties ◽  
Polybutylene Terephthalate ◽  
Topographic Analysis ◽  
Separation Membranes ◽  
Gas Separation Membranes ◽  
Wide Range ◽  
Ether Ester ◽  
Dense Films

The last decade has seen an exponential increase in the number of studies focused on novel applications for ionic liquids (ILs). Blends of polymers with ILs have been proposed for use in fuel cells, batteries, gas separation membranes, packaging, etc., each requiring a set of specific physico-chemical properties. In this work, blends of four grades of the poly(ether-ester) multiblock copolymer PolyActive™ with different concentrations of the CO2-philic 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [BMIM][Tf2N] were prepared in the form of dense films by a solution casting and solvent evaporation method, in view of their potential use as gas separation membranes for CO2 capture. Depending on the polymer structure, the material properties could be tailored over a wide range by means of the IL content. All samples were dry-feeling, highly elastic self-standing dense films. The microstructure of the blends was studied by scanning electron microscopy with a backscattering detector, able to observe anisotropy in the sample, while a special topographic analysis mode allowed the visualization of surface roughness. Samples with the longest poly(ethylene oxide terephthalate) (PEOT) blocks were significantly more anisotropic than those with shorter blocks, and this heterogeneity increased with increasing IL content. DSC analysis revealed a significant decrease in the melting enthalpy and melting temperature of the crystalline PEOT domains with increasing IL content, forming an amorphous phase with Tg ≈ −50 °C, whereas the polybutylene terephthalate (PBT) phase was hardly affected. This indicates better compatibility of the IL with the polyether phase than the polyester phase. Young’s modulus was highest and most IL-dependent for the sample with the highest PEOT content and PEOT block length, due to its high crystallinity. Similarly, the sample with short PEOT blocks and high PBT content also showed a high modulus and tensile strength, but much lower maximum elongation. This study provides a detailed discussion on the correlation between the morphological, thermal, and mechanical properties of these PolyActive™/[BMIM][Tf2N] blends.

Thermal and mechanical properties of polypropylene nanocomposite materials reinforced with cellulose nano whiskers

2012 ◽  
Vol 125 (4) ◽  
pp. 2882-2889 ◽  
Author(s):  
Elif Bahar ◽  
Nuray Ucar ◽  
Aysen Onen ◽  
Youjiang Wang ◽  
Mustafa Oksüz ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Nanocomposite Materials ◽  
Thermal And Mechanical Properties
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