Properties and paper sizing application of waterborne polyurethanemicroemulsions: Effects of extender, cross-linker, and polyol

2016 ◽  
Vol 133 (25) ◽  
Author(s):  
Ke Zhu ◽  
Xiaorui Li ◽  
Haihua Wang ◽  
Guiqiang Fei ◽  
Jingyi Li
Keyword(s):  
Paper Sizing ◽  
Cross Linker

Cross-linked polyvinyl alcohol modified by aziridine cross-linker for effective paper sizing

2021 ◽  
Vol 161 ◽  
pp. 106482
Author(s):  
Kaibin Li ◽  
Xiaorui Li ◽  
Chunyan Li ◽  
Yiding Shen ◽  
Dan Wang
Keyword(s):  
Polyvinyl Alcohol ◽  
Paper Sizing ◽  
Cross Linker

Influence of Polymer Charge, Temperature, and Surfactants on Surface Sizing of Liner and Greaseproof Paper With Hydrophobically Modified Starch

TAPPI Journal ◽  
2009 ◽  
Vol 8 (2) ◽  
pp. 33-38 ◽  
Author(s):  
ANNA JONHED ◽  
LARS JÄRNSTRÖM
Keyword(s):  
Phase Separation ◽  
Contact Angles ◽  
Low Ph ◽  
Hydrophobically Modified ◽  
Paper Sizing ◽  
Surface Sizing ◽  
Separation Temperature ◽  
Hydrophobic Nature ◽  
Sizing Agents ◽  
Charge Temperature

The aim of this study was to investigate the properties of hydrophobically modified (HM) quaterna-ry ammonium starch ethers for paper sizing. These starches possess temperature-responsive properties; that is, gelation or phase separation occurs at a certain temperature upon cooling. This insolubility of the HM starches in water at room temperature improved their performance as sizing agents. The contact angles for water on sized liner were substantially larger than on unsized liner. When the application temperature was well above the critical phase-separation temperature, larger contact angles were obtained for liner independently of pH compared with those at the lower application temperature. Cobb60 values for liner decreased upon surface sizing, with a low pH and high application temperature giving lower water penetration. Contact angles on greaseproof paper decreased upon sur-face sizing as compared to unsized greaseproof paper, independently of pH and temperature. Greaseproof paper showed no great difference between unsized substrates and substrates sized with HM starch at different pH. This is probably due to the already hydrophobic nature of greaseproof paper. However, the Cobb60 values increased at low pH and low application temperature. Surfactants were added to investigate how they affect the sized surface. Addition of surfactant reduces the contact angles, in spite of indications of complex formation.

Reducing the Risk in Controlled Drug Release by Using Tannic Acid in Liposomal Formulations

2018 ◽  
Vol 68 (12) ◽  
pp. 2925-2918
Author(s):  
Gabriela Cioca ◽  
Maricel Agop ◽  
Marcel Popa ◽  
Simona Bungau ◽  
Irina Butuc
Keyword(s):  
Drug Release ◽  
Tannic Acid ◽  
Release Rate ◽  
Controlled Drug Release ◽  
Toxicity Threshold ◽  
Release System ◽  
Liposomal Formulations ◽  
Cross Linker ◽  
Natural Cross

One of the main challenges in designing a release system is the possibility to control the release rate in order to maintain it at a constant value below a defined limit, to avoid exceeding the toxicity threshold. We propose a method of overcoming this difficulty by introducing the drug into liposomes, prior to its inclusion in the hydrogel. Furthermore, a natural cross linker (as is tannic acid) is used, instead of the toxic cross linkers commonly used, thus reducing the toxicity of the release system as a whole.

Paper sizing with gelatine: from the macro- to the nano-scale

Cellulose ◽  
2021 ◽  
Author(s):  
Alice Gimat ◽  
Anne Michelin ◽  
Oulfa Belhadj ◽  
Eleonora Pellizzi ◽  
Pascale Massiani ◽  
...  
Keyword(s):  
Nano Scale ◽  
Paper Sizing

scholarly journals Tannic-Acid-Cross-Linked and TiO2-Nanoparticle-Reinforced Chitosan-Based Nanocomposite Film

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 228
Author(s):  
Swarup Roy ◽  
Lindong Zhai ◽  
Hyun Chan Kim ◽  
Duc Hoa Pham ◽  
Hussein Alrobei ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tannic Acid ◽  
Nanocomposite Film ◽  
Food Packaging ◽  
Titanium Dioxide Nanoparticles ◽  
Casting Technique ◽  
Active Food Packaging ◽  
Reinforcing Agent ◽  
Solution Casting Technique ◽  
Cross Linker

A chitosan-based nanocomposite film with tannic acid (TA) as a cross-linker and titanium dioxide nanoparticles (TiO2) as a reinforcing agent was developed with a solution casting technique. TA and TiO2 are biocompatible with chitosan, and this paper studied the synergistic effect of the cross-linker and the reinforcing agent. The addition of TA enhanced the ultraviolet blocking and mechanical properties of the chitosan-based nanocomposite film. The reinforcement of TiO2 in chitosan/TA further improved the nanocomposite film’s mechanical properties compared to the neat chitosan or chitosan/TA film. The thermal stability of the chitosan-based nanocomposite film was slightly enhanced, whereas the swelling ratio decreased. Interestingly, its water vapor barrier property was also significantly increased. The developed chitosan-based nanocomposite film showed potent antioxidant activity, and it is promising for active food packaging.

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