Preparation and characterization of compatibilized and toughened polylactic acid/cellulose acetate films by long‐chain hyperbranched polymers

2021 ◽  
pp. 52097
Author(s):  
Yansong Huang ◽  
Yujuan Jin ◽  
Bo Wang ◽  
Huafeng Tian ◽  
Yunxuan Weng ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Polylactic Acid ◽  
Hyperbranched Polymers ◽  
Long Chain

High‐toughening modification of polylactic acid by long‐chain hyperbranched polymers

2021 ◽  
pp. 51295
Author(s):  
Jianjian Sun ◽  
Yujuan Jin ◽  
Bo Wang ◽  
Huafeng Tian ◽  
Kaier Kang ◽  
...  
Keyword(s):  
Polylactic Acid ◽  
Hyperbranched Polymers ◽  
Long Chain ◽  
Toughening Modification

Preparation and characterization of hydroxyapatite-polylactic acid HA-PLA composite film

2016 ◽  
Vol 33 (1) ◽  
pp. 10 ◽  
Author(s):  
Qiuhua Yuan ◽  
Jianbo Wu ◽  
Caoping Qin ◽  
Zhiwei Guo ◽  
Jiayu Liu ◽  
...  
Keyword(s):  
Composite Film ◽  
Polylactic Acid

Effect of the structure of cellulose acetate membranes on their permeability, electrical conductivity and rejection

1990 ◽  
Vol 55 (12) ◽  
pp. 2933-2939 ◽  
Author(s):  
Hans-Hartmut Schwarz ◽  
Vlastimil Kůdela ◽  
Klaus Richau
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Cellulose Acetate ◽  
Reverse Osmosis ◽  
Water Flux ◽  
Cellulose Acetate Membrane ◽  
Structure Parameters ◽  
Dc Electrical Conductivity ◽  
Cellulose Acetate Membranes

Ultrafiltration cellulose acetate membrane can be transformed by annealing into reverse osmosis membranes (RO type). Annealing brings about changes in structural properties of the membranes, accompanied by changes in their permeability behaviour and electrical properties. Correlations between structure parameters and electrochemical properties are shown for the temperature range 20-90 °C. Relations have been derived which explain the role played by the dc electrical conductivity in the characterization of rejection ability of the membranes in the reverse osmosis, i.e. rRO = (1 + exp (A-B))-1, where exp A and exp B are statistically significant correlation functions of electrical conductivity and salt permeation, or of electrical conductivity and water flux through the membrane, respectively.

scholarly journals Synthesis and Characterization of Partially Renewable Oleic Acid-Based Ionomers for Proton Exchange Membranes

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 130
Author(s):  
Carlos Corona-García ◽  
Alejandro Onchi ◽  
Arlette A. Santiago ◽  
Araceli Martínez ◽  
Daniella Esperanza Pacheco-Catalán ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Proton Conductivity ◽  
Electrochemical Impedance ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Molar Ratio ◽  
Aromatic Diamines ◽  
Chemical Structures ◽  
Long Chain

The future availability of synthetic polymers is compromised due to the continuous depletion of fossil reserves; thus, the quest for sustainable and eco-friendly specialty polymers is of the utmost importance to ensure our lifestyle. In this regard, this study reports on the use of oleic acid as a renewable source to develop new ionomers intended for proton exchange membranes. Firstly, the cross-metathesis of oleic acid was conducted to yield a renewable and unsaturated long-chain aliphatic dicarboxylic acid, which was further subjected to polycondensation reactions with two aromatic diamines, 4,4′-(hexafluoroisopropylidene)bis(p-phenyleneoxy)dianiline and 4,4′-diamino-2,2′-stilbenedisulfonic acid, as comonomers for the synthesis of a series of partially renewable aromatic-aliphatic polyamides with an increasing degree of sulfonation (DS). The polymer chemical structures were confirmed by Fourier transform infrared (FTIR) and nuclear magnetic resonance (1H, 13C, and 19F NMR) spectroscopy, which revealed that the DS was effectively tailored by adjusting the feed molar ratio of the diamines. Next, we performed a study involving the ion exchange capacity, the water uptake, and the proton conductivity in membranes prepared from these partially renewable long-chain polyamides, along with a thorough characterization of the thermomechanical and physical properties. The highest value of the proton conductivity determined by electrochemical impedance spectroscopy (EIS) was found to be 1.55 mS cm−1 at 30 °C after activation of the polymer membrane.

scholarly journals Fabrication and characterization of cellulose acetate-based nanofibers and nanofilms for H2S gas sensing application

2021 ◽  
Vol 258 ◽  
pp. 117643
Author(s):  
Nour S. Abdel Rahman ◽  
Yaser E. Greish ◽  
Saleh T. Mahmoud ◽  
Naser N. Qamhieh ◽  
Hesham F. El-Maghraby ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Gas Sensing ◽  
Sensing Application ◽  
Fabrication And Characterization
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