scholarly journals Hydrogels Are Reinforced with Colombian Fique Nanofibers to Improve Techno-Functional Properties for Agricultural Purposes

Agriculture ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 117
Author(s):  
Marcelo A. Guancha-Chalapud ◽  
Liliana Serna-Cock ◽  
Diego F. Tirado
Keyword(s):  
Cellulose Nanofibers ◽  
Polymer Chains ◽  
Reactive System ◽  
Solution Polymerization ◽  
Network Stability ◽  
Net Production ◽  
Swelling Capacity ◽  
Hydrogel Formulation ◽  
Fique Fibers ◽  
Polymerization Method

Colombia is the world’s largest producer of fique fibers (Furcraea bedinghausii), with a net production of 30,000 tons per year. This work proposes to revalue waste from the Colombian fique agroindustry. For this purpose, cellulose nanofibers were obtained from fique and used as reinforcement material to create acrylic superabsorbent hydrogels. Unreinforced acrylic hydrogels (AHR0) and acrylic hydrogels reinforced with fique nanofibers at 3% w/w (AHR3), 5% w/w (AHR5), and 10 % w/w (AHR10) were synthesized using the solution polymerization method. The best hydrogel formulation for agricultural purposes was chosen by comparing their swelling behavior, mechanical properties, and using scanning electron microscopy (SEM). By raising the nanofiber concentration to 3% (AHR3), the best-chosen formulation, the interaction between the nanofibers and the polymer matrix increased, which favored the network stability. However, beyond AHR3, there was a higher viscosity of the reactive system, which caused a reduction in the mobility of the polymer chains, thus disfavoring the swelling capacity. The reinforced hydrogel proposed in this study (AHR3) could represent a contribution to overcoming the problems of land dryness present in Colombia, an issue that will worsen in the coming years due to the climate emergency.

scholarly journals Highly exfoliated montmorillonite clay reinforced thermoplastic polyurethane elastomer:in situpreparation and efficient strengthening

RSC Advances ◽  
2019 ◽  
Vol 9 (15) ◽  
pp. 8184-8196 ◽  
Author(s):  
Jingshui Xu ◽  
Lihua Cheng ◽  
Zhong Zhang ◽  
Ling Zhang ◽  
Cen Xiong ◽  
...  
Keyword(s):  
Thermoplastic Polyurethane ◽  
Montmorillonite Clay ◽  
Solution Polymerization ◽  
Polyurethane Elastomers ◽  
Thermoplastic Polyurethane Elastomers ◽  
Mmt Clay ◽  
Polymerization Method

Highly exfoliated montmorillonite (MMT) clay reinforced thermoplastic polyurethane elastomers (TPUs) were prepared by anin situsolution polymerization method.

Kinetics of methylene blue dye adsorptive removal using halloysite nanocomposite hydrogels

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sadia Ata ◽  
Sadaf Amin ◽  
Ismat Bibi ◽  
Ijaz-ul- Mohsin ◽  
Atif Islam ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Polymer Chains ◽  
Blue Dye ◽  
Methylene Blue Dye ◽  
Nanocomposite Hydrogels ◽  
Antimicrobial Efficiency ◽  
Nano Clay ◽  
Swelling Capacity ◽  
Solution Casting Method ◽  
Adsorption Desorption

Abstract In the present work, halloysite nano-clay (HNTs) based hydrogel was fabricated and their efficiency for the removal of methylene blue dye was studied. The hydrogel films were prepared with varying amount of halloysite nano-clay via facile solution casting method. Effect of halloysite clay on adsorption performance of composite was investigated. The hydrophobic thermoplastic synthetic polymer, polylactic acid (PLA) was blended with hydrophilic polymer polyvinyl alcohol (PVA) and HNTs to synthesize hydrogels. Swelling behavior and antimicrobial efficiency was also evaluated. The halloysite incorporating films showed excellent antibacterial activity. Swelling capacity of hydrogel with increased halloysite content was reduced due to increased crosslinking among polymer chains. Halloysite incorporated hydrogel exhibited higher adsorption ability as compared to film comprising of only PVA and PLA and dye removal followed pseudo first order kinetics. Film with 0.03 g HNTs rapidly attained adsorption-desorption equilibria and removed the dye completely within 30 min. Results confirmed that synthesized film could be potentially used for the removal of cationic dye and fabricated hydrogel film have promising potential for wastewater treatment since a higher adsorption capacity was observed for halloysite nano-clay incorporated hydrogel.

Characterization of electrospun polylactide nanofibers modified via atom transfer radical polymerization

2020 ◽  
pp. 152808372093038 ◽  
Author(s):  
Muhammad Mushtaq ◽  
Rahim Jindani ◽  
Amjad Farooq ◽  
Xin Li ◽  
Hina Saba ◽  
...  
Keyword(s):  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Photoelectron Spectroscopy ◽  
Polymer Chains ◽  
Surface Grafting ◽  
Atom Transfer ◽  
X Ray ◽  
Polymerization Method ◽  
Scanning Electron

Polylactic acid-based membranes received considerable attention due to its novel biocompatibility, renewability, and biodegradability. In this study, PLA electrospun nanofibrous membrane was prepared and 2-dimethylaminoethyl methacrylate (DMAEMA) was used as a monomer for surface grafting of polymer chains via the atom transfer radical polymerization method. Then the PLA nanofibers were quaternized by using bromoethane. The characterization of poly(DMAEMA) graft PLA nanofiber (poly(DMAEMA)-g-PLA) membranes was done by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and energy dispersive X-ray spectroscopy. The results showed that the diameter of PLA nanofibers increased 15% as the concentration increased from 10% to 12% and then increased 23% as the concentration of PLA solution increased from 10% to 15%. But the regularity of average diameters is best achieved at 12% concentration.

Effect of Polymerization on the Swelling Properties of a Sodium Bentonite and its Mechanism

2020 ◽  
Vol 1003 ◽  
pp. 228-232
Author(s):  
Ji Xiang Nie ◽  
Ryoga Tanaka ◽  
Jin Chun Chai
Keyword(s):  
Free Radical ◽  
Deionized Water ◽  
Polymer Chains ◽  
Nacl Solution ◽  
X Ray Diffraction ◽  
Swelling Properties ◽  
Sodium Bentonite ◽  
X Ray ◽  
Free Swelling ◽  
Polymerization Method

The effect of polymerization on the swelling properties of a sodium bentonite has been investigated experimentally using free swelling index (FSI). Using free radical polymerization method in cationic solution with acrylate acid as the monomer (M) and potassium persulfate as initiator (I), the optimum conditons for higher FSI value in 0.6 M NaCl solution were pH of 5.5 and I/M ratio of 0.005. The polymerized bentonite (PB) had much higher FSI values than that of untreated bentonite (UB) in deionized water and 0.6 M NaCl solution. However, in the 0.6 M CaCl2 solution, the FSI value of PB was slightly lower than that of UB and the reason is not clear yet. The X-ray diffraction (XRD) test shows that polymer chains did not enter the interlayer of sodium bentonite crystals and it is postulated that the polymers only wrapped around the particles of the bentonite.

scholarly journals Water Absorption Enhancement of Sodium Poly Acrylate and Poly(2-Acrylamido-2-Methylpropane Sulphonic Acid) Based Hydrogel Mixtures

2021 ◽  
Vol 15 (1) ◽  
pp. 49-54
Author(s):  
Sohair A. Darwish ◽  
Ibrahim M. Ibrahim ◽  
Nasser Y. Mostafa ◽  
Mostafa A. Radwan ◽  
Mohamed A. Sadek ◽  
...  
Keyword(s):  
Free Radical ◽  
Sulfonic Acid ◽  
Room Temperature ◽  
Three Dimensional ◽  
Sulphonic Acid ◽  
Hydrophilic Polymers ◽  
Absorption Enhancement ◽  
Solution Polymerization ◽  
Swelling Capacity ◽  
Glass Tubes

Introduction: Hydrogels are hydrophilic polymers which are cross-linked to form three-dimensional structures, which can absorb, swell and retain huge amounts of water or aqueous fluids. Objective: This paper reports the preparation and characterisation of Poly(2-Acrylamido-2-Methylpropane Sulphonic Acid) (PAMPS) hydrogel with different crosslinking intensities. Methodology: 2-Acrylamido-2-methylpropane sulfonic acid (AMPS) monomer was purchased from Alfa Aesar Company as reagent grade. It was used as received (>98% purity) without any further purification. PAMPS hydrogel was prepared by free radical crosslinking solution polymerization of AMPS in water at room temperature under a nitrogen blanket in cylindrical glass tubes. The characteristics of the obtained PAMPS hydrogel were compared with those of commercial sodium polyacrylates hydrogel. Results: It was found that decreasing the crosslinker weight improved the absorbance capacity but to a limit. The suggested reasons were discussed. The mixture showed higher absorbance rate than PAMPS, and bigger absorbance capacity than sodium polyacrylates. Conclusion: This paper investigates the effect of crosslinker ratio on the swelling capacity of PAMPS. It was found that as the crosslinking ratio decreases, the porosity of the hydrogel increases, thus improving the swelling capacity.

Synthesis and characterization of poly(p-phenylene terephthalate) crystals obtained by crystallization during polymerization

1994 ◽  
Vol 6 (1) ◽  
pp. 83-93 ◽  
Author(s):  
Kunio Kimura ◽  
Seiji Endo ◽  
Yasuo Kato ◽  
Yuhiko Yamashita
Keyword(s):  
Molecular Structure ◽  
Single Crystals ◽  
Structural Study ◽  
Terephthalic Acid ◽  
Polymer Chains ◽  
Synthesis And Characterization ◽  
Solution Polymerization ◽  
Different Types ◽  
Polymerization Conditions

Poly(p-phenylene terephthalate) (PPTE) crystals were prepared by hightemperature solution polymerization via three different types of reaction as follows: bimolecular condensation of (1) 1,4-diacetoxybenzene and terephthalic acid and (2) hydroquinone and diphenyl terephthalate and self-condensation of (3) mono(4'-acetoxyphenyl) terephthalate. In spite of the reaction types, needle-like crystals are not obtained as found with poly(oxy-l,4-benzenediylcarbonyl) (POB) whiskers, under polymerization conditions identical with those used to produce POB whiskers. PPTE and POB have similar molecular structure that is, they comprise 1,4-phenylene groups and ester linkages. whereas the morphologies of the crystals obtained are quite different. From the structural study, PPTE crystals are single crystals, and polymer chains align perpendicular to the plane of the sheaf-like or plate-like crystal.

Study on the Preparation and Properties of PAA/BC/Na-MMT Composites

2011 ◽  
Vol 236-238 ◽  
pp. 1766-1769
Author(s):  
Hui Ling Shen ◽  
Li Juan Long ◽  
Shi Ru Jia
Keyword(s):  
Thermal Stability ◽  
Aqueous Solution ◽  
Network Structure ◽  
Layered Structure ◽  
Polyacrylic Acid ◽  
Sem Analysis ◽  
Solution Polymerization ◽  
Aqueous Solution Polymerization ◽  
Polymerization Method ◽  
Thermal Stability Of

By means of aqueous solution polymerization method, the composites of polyacrylic acid (PAA)/Bacterial cellulose (BC)/Na-MMT and PAA/Na-MMT were prepared respectively. The effects of Na-MMT content on the properties of PAA/Na-MMT and BC content on the properties of PAA/BC/Na-MMT composites were investigated. The results show that with appropriate increasing Na-MMT, the composites has good salt-resistant ability and thermal stability, mean while, the water-absorbing capacity of PAA/Na-MMT composites is significantly increased. Comparing with that of the PAA/Na-MMT hydrogel, with addition of BC content, the water-absorbing capacity and thermal stability of PAA/BC/Na-MMT are enhanced in a certain degree. The SEM analysis indicate that there are more network structure in the composites hydrogel. XRD result shows that the layered structure of Na-MMT is stripped and the prepared composites achieves peel compound.

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