Evaluation of Nanostructure, optical absorption, and thermal behavior of poly(vinyl alcohol)/poly (N -vinyl-2-pyrrolidone) based nanocomposite films containing coated SiO2 nanoparticles with citric acid and l (+)-ascorbic acid

2016 ◽  
Vol 39 (6) ◽  
pp. 2012-2018 ◽  
Author(s):  
Shadpour Mallakpour ◽  
Mina Naghdi
Keyword(s):  
Ascorbic Acid ◽  
Citric Acid ◽  
Optical Absorption ◽  
Thermal Behavior ◽  
Vinyl Alcohol ◽  
Sio2 Nanoparticles ◽  
Nanocomposite Films ◽  
Poly Vinyl Alcohol

scholarly journals Graphene Based Poly(Vinyl Alcohol) Nanocomposites Prepared by In Situ Green Reduction of Graphene Oxide by Ascorbic Acid: Influence of Graphene Content and Glycerol Plasticizer on Properties

Nanomaterials ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1013 ◽  
Author(s):  
Mónica Cobos ◽  
M. Fernández ◽  
M. Fernández
Keyword(s):  
Ascorbic Acid ◽  
Graphene Oxide ◽  
Water Absorption ◽  
Vinyl Alcohol ◽  
Nanocomposite Films ◽  
Ex Situ ◽  
Poly Vinyl Alcohol ◽  
Vapor Permeability ◽  
Water Barrier

The enhanced properties of polymer nanocomposites as compared with pure polymers are only achieved in the presence of well-dispersed nanofillers and strong interfacial adhesion. In this study, we report the preparation of nanocomposite films based on poly(vinyl alcohol) (PVA) filled with well dispersed graphene sheets (GS) by in situ reduction of graphene oxide (GO) dispersed in PVA solution using ascorbic acid (L-AA) as environmentally friendly reductant. The combined effect of GS content and glycerol as plasticizer on the structure, thermal, mechanical, water absorption, and water barrier properties of PVA/GS nanocomposite films is studied for the first time. Higher glass transition temperature, lower crystallinity, melting, and crystallization temperature, higher mechanical properties, and remarkable improvement in the thermal stability compared to neat PVA are obtained as a result of strong interfacial interactions between GS and PVA by hydrogen bonding. PVA/GS composite film prepared by ex situ process is more brittle than its in situ prepared counterpart. The presence of GS improves the water barrier and water resistance properties of nanocomposite films by decreasing water vapor permeability and water absorption of PVA. This work demonstrates that the tailoring of PVA/GS nanocomposite properties is enabled by controlling GS and glycerol content. The new developed materials, particularly those containing plasticizer, could be potential carriers for transdermal drug delivery.

Branched/Hyperbranched Copolyesters from Poly(vinyl alcohol) and Citric Acid as Delivery Agents and Tissue Regeneration Scaffolds

2021 ◽  
pp. 2100134
Author(s):  
Srijoni Sengupta ◽  
Abhishek Singh ◽  
Koushik Dutta ◽  
Ram Prasad Sahu ◽  
Satish Kumar ◽  
...  
Keyword(s):  
Citric Acid ◽  
Tissue Regeneration ◽  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol

High barrier graphene oxide nanosheet/poly(vinyl alcohol) nanocomposite films

2012 ◽  
Vol 409-410 ◽  
pp. 156-163 ◽  
Author(s):  
Hua-Dong Huang ◽  
Peng-Gang Ren ◽  
Jun Chen ◽  
Wei-Qin Zhang ◽  
Xu Ji ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Vinyl Alcohol ◽  
Nanocomposite Films ◽  
Poly Vinyl Alcohol ◽  
Graphene Oxide Nanosheet
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