Journal ArticleDOI
Miscibility of polyimide blends: Physicochemical characterization of two high performance polyimide polymers
TLDR
In this article, the intermolecular interactions and miscibility behavior of two polyimide blend systems, Extem/Matrimid and extem/U-Varnish, in compositions of 100/0, 80/20, 50/50, 20/80, 0/100 have been evaluated by different analytical techniques such as optical microscopy, Differential scanning calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD) and rheological measurements.Abstract:
The intermolecular interactions and miscibility behavior of two polyimide blend systems, Extem/Matrimid and Extem/U-Varnish, in compositions of 100/0, 80/20, 50/50, 20/80, 0/100 have been evaluated. The polymer blend systems have been characterized by different analytical techniques such as optical microscopy, Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectroscopy (FTIR), X-ray diffraction (XRD) and rheological measurements. DSC results for the Extem/U-Varnish system showed the existence of a single glass transition temperature (Tg) in each composition, suggesting the miscibility of the blends, whereas DSC analysis of Extem/Matrimid system indicated immiscibility but compatibility between two polymers. In order to study the specific interactions between Extem and U-Varnish polymers, the Tgs of the polymer blends were estimated by theoretical equations and compared with experimental data. The empirical Tg values formed a concave curve as a function of composition and exhibited a positive deviation from the linearity, indicating the presence of specific interactions between Extem and U-Varnish polymer chains; this was confirmed by FTIR spectra. Interactions between studied polymer systems and four aprotic solvents including N -methyl-2-pyrrolidone (NMP), Dimethylacetamide (DMAc), Dimethylformamide (DMF) and Dimethyl sulfoxide (DMSO) were assessed on the basis of the difference between their solubility parameters. Among the selected solvents, DMAc showed the highest affinity with both blend systems. XRD patterns and rheological behavior of Extem/U-Varnish system revealed that the crystalline nature and viscosity of the blend polymers decreases as the ratio of Extem/U-Varnish increases. As an overall conclusion, Extem and U-Varnish were found to constitute a miscible pair at a molecular level over the entire composition range whereas Extem and Matrimid could not form a miscible blend.read more
Citations
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Journal ArticleDOI
Recent Advances in Polymer Blend Membranes for Gas Separation and Pervaporation
Wai Fen Yong,Hao Zhang +1 more
TL;DR: In this paper, the authors summarized the fundamental understanding of phase behaviors, molecular interactions, separation properties and prediction models from the polymer blend membranes and reviewed the recent progress on state-of-the-art polymer blend membrane in various energy-related applications.
Journal ArticleDOI
A ground breaking polymer blend for CO2/N2 separation
Saeed Mazinani,Rouzbeh Ramezani,Siavash Darvishmanesh,Gomotsegang F. Molelekwa,Gomotsegang F. Molelekwa,Renzo Di Felice,Bart Van der Bruggen,Bart Van der Bruggen +7 more
TL;DR: In this article, the commercial polyetherimide sulfone polymer Extem was blended with polyethersulfone (PES) to achieve a new, highly selective membrane for CO2/N2 separation in order to allow for a breakthrough in carbon capture applications.
Journal ArticleDOI
Bridging the miscibility gap to fabricate delamination-free dual-layer nanofiltration membranes via incorporating fluoro substituted aromatic amine
Zhen-Yuan Wang,Zheng-Jun Fu,Dan-Dan Shao,Mei-Jin Lu,Qian-Cheng Xia,Hui-Fang Xiao,Baowei Su,Shi-Peng Sun +7 more
TL;DR: In this article, a dual-layer hollow fiber nanofiltration membranes were obtained by incorporating 4-fluoro-2-(trifluoromethyl) benzylamine (FTB) in P84® polyimide.
Journal ArticleDOI
Antibacterial nanofibers based on poly(l-lactide-co-d, l-lactide) and poly(vinyl alcohol) used in wound dressings potentially: a comparison between hybrid and blend properties
Pejman Ghaffari-Bohlouli,Fatemeh Hamidzadeh,Payam Zahedi,Mohsen Shahrousvand,Mahshid Fallah-Darrehchi +4 more
TL;DR: The SNL 76/7 fibroblast cell line culture confirmed that the hybrid-Tri nanofibrous sample had better proliferation performance than the blend-Tri sample because of the minimal cytotoxicity and maximal cell viability by MTT and acridine orange/ethidium bromide staining.
Journal ArticleDOI
Insights into molecular engineering of membranes based on fluorinated polyimide-polyamide miscible blends which do not obey the trade-off rule
Irina Butnaru,Catalin-Paul Constantin,Mihai Asandulesa,Aleksandra Wolińska-Grabczyk,Andrzej Jankowski,Urszula Szeluga,Mariana-Dana Damaceanu +6 more
TL;DR: In this article, a series of polyimide (PI) -polyamide (PA) miscible blends were analyzed with respect to their miscibility, morphology, crystallinity, optical transparency, dielectric and mechanical properties.
References
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