The Influence of the Blend Ratio, Solvent Additive, and Post-production Treatment on the Polymer Dynamics in PTB7:PCBM Blend Films

2021 ◽  
Author(s):  
Dominik M. Schwaiger ◽  
Wiebke Lohstroh ◽  
Peter Müller-Buschbaum
Keyword(s):  
Polymer Dynamics ◽  
Blend Ratio ◽  
Blend Films ◽  
Solvent Additive ◽  
Post Production

scholarly journals Processing and nanomechanical properties of chitosan/polyethylene oxide blend films

2012 ◽  
Vol 77 (12) ◽  
pp. 1723-1733 ◽  
Author(s):  
Jelena Djokic ◽  
Aleksandar Kojovic ◽  
Dusica Stojanovic ◽  
Aleksandar Marinkovic ◽  
Goran Vukovic ◽  
...  
Keyword(s):  
Polyethylene Oxide ◽  
Manufacturing Cost ◽  
Scanning Calorimetry ◽  
Blend Ratio ◽  
Blend Films ◽  
Nanomechanical Properties ◽  
Mechanical Integrity ◽  
Reduced Modulus ◽  
Optimal Values ◽  
Chitosan Films

Chitosan based films have found an increasing implementation in variety of topics among which as drug delivery carriers, in packaging industry and as water puritication filters. Therefore, in order to achieve mechanical integrity of such films while preserving processability and biocompatibility, chitosan based films are fabricated in forms of blends with polyethylene oxide (PEO). Nanoindentation study is undertaken in order to investigate nanomechanical properties and surface morphology of chitosan films in blends with various content of PEO. Results of differential scanning calorimetry, water uptake and nanoindentation revealed that films with 80/20 blend ratio of chitosan/PEO showed the optimal values of reduced modulus and hardness. It appears that the incorporation of synthetic PEO in chitosan films could lower the manufacturing cost while preserving the mechanical integrity of the films.

High-performing random terpolymer-based nonfullerene polymer solar cells fabricated using solvent additive-free as-cast blend films

2018 ◽  
Vol 56 (14) ◽  
pp. 1528-1535 ◽  
Author(s):  
Mai Ha Hoang ◽  
Gi Eun Park ◽  
Dinh Long Phan ◽  
Trinh Tung Ngo ◽  
Tuyen Van Nguyen ◽  
...  
Keyword(s):  
Solar Cells ◽  
Polymer Solar Cells ◽  
High Performing ◽  
Blend Films ◽  
Solvent Additive

Silk Fibroin/Hyaluronic Acid Blend Film with Good Water Stability and Cytocompatibility

2013 ◽  
Vol 377 ◽  
pp. 209-214
Author(s):  
Ling Shuang Wang ◽  
Shu Qin Yan ◽  
Ming Zhong Li
Keyword(s):  
Cell Proliferation ◽  
Hyaluronic Acid ◽  
Silk Fibroin ◽  
Biomedical Applications ◽  
Water Resistance ◽  
High Water ◽  
Casting Method ◽  
Blend Ratio ◽  
Blend Films

Stimulating cell proliferation is a challenge in the field of silk fibroin-based biomaterials. In this study, silk fibroin/hyaluronic acid blend films were prepared by a casting method using carbodiimide as a cross-linking agent. Carbodiimide induced silk fibroin to form Silk I crystal structure which was not affected by the presence of hyaluronic acid. The films showed high water resistance. In vitro, the performance of these films was assessed by seeding L929 cells. The results indicated that the silk fibroin/hyaluronic acid blend films with the blend ratio of 80/20 and 60/40 promoted cell proliferation compared with the pure silk fibroin or hyaluronic acid film. These results suggest that silk fibroin/hyaluronic acid blend films are water stable and cytocompatible materials which are expected to be useful in biomedical applications.

scholarly journals Preparation of Biodegradable Silk Fibroin/Alginate Blend Films for Controlled Release of Antimicrobial Drugs

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Yaowalak Srisuwan ◽  
Yodthong Baimark
Keyword(s):  
Controlled Release ◽  
Drug Release ◽  
Silk Fibroin ◽  
Water Soluble ◽  
Drug Release Profile ◽  
Sem Images ◽  
Blend Ratio ◽  
Blend Films ◽  
Vis Spectroscopy

Silk fibroin (SF)/alginate blend films have been prepared for controlled release of tetracycline hydrochloride, an antimicrobial model drug. The blend films were analysed by Fourier transform infrared (FTIR) spectroscopy, scanning electron microscopy (SEM), and UV-vis spectroscopy. The functional groups of the SF/alginate blends were monitored from their FTIR spectra. The homogeneity of the blend films was observed from SEM images. The dissolution and film transparency of the blend films depended on the SF/alginate blend ratio. Thein vitrodrug release profile of the blend films was determined by plotting the cumulative drug release versus time. It was found that the drug release significantly decreased as the SF/alginate blend ratio increased. The results demonstrated that the SF/alginate blend films should be a useful controlled-release delivery system for water-soluble drugs.

scholarly journals Improvement in Crystallizability and Melt Flow Property of Linear Poly(L-lactide) Bioplastic by Blending with Star-shaped Poly(L-lactide)

2018 ◽  
Vol 34 (4) ◽  
pp. 1878-1883 ◽  
Author(s):  
Yodthong Baimar ◽  
Yaowalak Srisuwan
Keyword(s):  
Flow Property ◽  
Nucleating Agent ◽  
Chain Extender ◽  
Chain Extension ◽  
Melt Blending ◽  
Melt Flow ◽  
Blend Ratio ◽  
Melt Strength ◽  
Blend Films ◽  
Linear Poly

This research focuses on the crystallizability and melt flow property of linear poly(L-lactide) (1-PLL) by blending with star-shaped 16-arm PLL (16-PLL). The 1-PLL/16-PLL blends were chain extended during melt blending using an epoxy-based chain extender. The crystallinities of the 1-PLL/16-PLL blends increased with the 16-PLL blend ratio and chain extension reaction. The 16-PLL enhanced formation of branched PLL during chain extension was confirmed by thermogravimetry, and improved the melt flow property of the blends. Stresses at break of the compressed blend films were improved slightly by the 16-PLL blending and chain extension. In conclusion, the 16-PLL could be used as a nucleating agent and a melt strength enhancer for linear PLL.

White Electroluminescent Devices Using Polymer Blends

2003 ◽  
Vol 771 ◽  
Author(s):  
Do-Hoon Hwang ◽  
Jeong-Ik Lee ◽  
Chang-Hee Lee
Keyword(s):  
White Light ◽  
Light Emission ◽  
White Light Emission ◽  
Good Opportunity ◽  
Blend Ratio ◽  
Maximum Brightness ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Blend Films ◽  
Energy Transfers

AbstractWhite light-emitting devices were fabricated using the blends of blue, green, red emissive polymers of poly[9,9-(2'-ethylhexyl)fluorene] (PEHF), poly(9,9-dioctylfluorene-2,7-vinylene) (POFV), poly(2-(3',7'-dimethyloctyloxy)-5-methoxy-1,4-phenylene-1-cyanovinylene) (CNPPV) and poly(2-(2'-ethylhexyloxy)-5-methoxy-1,4-phenylenevinylene) (MEH-PPV). Inefficient energy transfers between the blue polymer and the green or the red polymer, which was observed in PL spectra of the blend films, provides a good opportunity to get white light emission due to better blend ratio controllability. The EL devices were fabricated with ITO/PEDOT/blend/Ca/Al configuration and good white light-emission was obtained for a certain blend ratio. The light-emission was observable from 4V and a maximum brightness of 400 cd/m2 was obtained with the device.

scholarly journals Selective Ammonia-Sensing Platforms Based on a Solution-Processed Film of Poly(3-Hexylthiophene) and p-Doping Tris(Pentafluorophenyl)Borane

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 128 ◽  
Author(s):  
Alem Araya Meresa ◽  
Felix Sunjoo Kim
Keyword(s):  
Weight Ratio ◽  
Lewis Base ◽  
Organic Transistors ◽  
Current Response ◽  
Blend Ratio ◽  
Blend Films ◽  
Ammonia Sensing ◽  
Sensing Platforms ◽  
Ammonia Sensors ◽  
P Type

Here, we fabricate ammonia sensors based on organic transistors by using poly(3-hexylthiophene) (P3HT) blended with tris(pentafluorophenyl)borane (TPFB) as an active layer. As TPFB is an efficient p-type dopant for P3HT, the current level of the blend films can be easily modulated by controlling the blend ratio. The devices exhibit significantly increased on-state and off-state current levels owing to the ohmic current originated from the large number of charge carriers when the active polymer layer contains TPFB with concentrations up to 20 wt % (P3HT:TPFB = 8:2). The current is decreased at 40 wt % of TPFB (P3HT:TPFB = 6:4). The P3HT:TPFB blend with a weight ratio of 9:1 exhibits the highest sensing performances for various concentrations of ammonia. The device exhibits an increased percentage current response compared to that of a pristine P3HT device. The current response of the P3HT:TPFB (9:1) device at 100 ppm of ammonia is as high as 65.8%, 3.2 times that of the pristine P3HT (20.3%). Furthermore, the sensor based on the blend exhibits a remarkable selectivity to ammonia with respect to acetone, methanol, and dichloromethane, owing to the strong interaction between the Lewis acid (TPFB) and Lewis base (ammonia).

scholarly journals Graphene Oxide-Polyaniline Coating on Ionic Polymer Blend Membrane for Actuation

2021 ◽  
Vol 33 (10) ◽  
pp. 2509-2513
Author(s):  
Km. Rachna ◽  
R.M. Mehra ◽  
Pramod K. Singh ◽  
N.B. Singh ◽  
Bhasker Pratap Choudhary ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Water Uptake ◽  
Mechanical Energy ◽  
Electrical Energy ◽  
Blend Ratio ◽  
Ionic Polymer ◽  
Blend Membrane ◽  
Blend Films ◽  
Solution Cast ◽  
Polymer Metal

Ionic polymer metal composites (IPMC) can be used as actuators and sensors and intrinsically have low activation voltage and large bending strain, which help to transform electrical energy to mechanical energy and can be utilized as bidirectional material. In this study, the ionic polymeric blend films/membranes of PVDF:PSSS:PVP in the blend ratio of 40:30:30; 50:30:20 and 60:15:25 (wt.%) is presented. The membranes were prepared by solution cast technique and coated with graphene oxide (GO)-polyaniline (PANI). Membranes were characterized by X-ray diffraction, optical microscopy. Electrical conductivities at different frequencies and water uptake properties were also determined. The actuating performance of PVDF:PSSS:PVP and water uptake of blend membrane was found to be maximum for the blend ratio of 60:15:25. PVDF:PSSS:PVP with blend ratio (60:15:25) also exhibited highest actuation at 10 V DC. Graphene oxide was prepared and characterized by using FTIR and Raman spectra. A brief account of the fabrication of IPMC and its actuation application was also presented.

scholarly journals Thermal and Mechanical Properties of Biodegradable Star-Shaped/Linear Polylactide Stereocomplexes

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Onanong Cheerarot ◽  
Yodthong Baimark
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Solvent Casting ◽  
Thermal And Mechanical Properties ◽  
Casting Method ◽  
Blend Ratio ◽  
Blend Films ◽  
Molecular Weights ◽  
Linear Poly ◽  
Blend Ratios

The 6-arm star-shaped poly(L-lactide) (6PLL)/linear poly(D-lactide) (1PDL) stereocomplex films were prepared by the solvent casting method. The influences of the 6PLL/1PDL blend ratios (75/25, 50/50, and 25/75 w/w) and 1PDL molecular weights (15,000, 30,000, and 60,000 g/mol) on the thermal and mechanical properties of the stereocomplex films were investigated. The 6PLL and 1PDLs had a single melting temperature (Tm) of homocrystallites at 174°C and 167°C, respectively. The 6PLL/1PDL blends had twoTms: a lowerTmof homocrystallites (160–173°C) and a higherTmof stereocomplex crystallites (219–228°C). The stereocomplex crystallinity and mechanical properties of the 6PLL/1PDL blend films were higher than those of 6PLL and 1PDL and were the highest in the 50/50 (w/w) blend ratio. However, the stereocomplex crystallinity of the 50/50 (w/w) 6PLL/1PDL blend films decreased and the mechanical properties increased as the molecular weight of 1PDL increased.

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