UV Curable Polyurethane Dispersions Extended by a New Chain Extender

2014 ◽  
Vol 904 ◽  
pp. 137-141
Author(s):  
Zheng Xiang Wang ◽  
Jian Long Wang ◽  
Qing Long Liu ◽  
Ji Tong Yuan ◽  
Hong Chen
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Chemical Structure ◽  
Waterborne Polyurethane ◽  
Chain Extender ◽  
Uv Curable ◽  
H Nmr ◽  
Branched Chains ◽  
Polyurethane Dispersions ◽  
Branched Structure

Ultraviolet (UV) curable waterborne polyurethane dispersions with comb branched structure were synthesized by prepolymer process. C=C bonds were incorporated into the branched chains of the polyurethane using chain extender, hence, the content of C=C bonds can be adjusted by the chain extender consumption. The chemical structure was identified by Fourier transform infrared spectroscopy (FTIR) and1H NMR. Effects of the chain extender content on the microstructure, rheological behavior, thermal property, mechanical and other properties of the UV cured films were researched.

Synthesis and Characterization of a New Kind of UV-Curable Cyclohexanone-Formaldehyde Resins

2012 ◽  
Vol 602-604 ◽  
pp. 660-663 ◽  
Author(s):  
Guang Yang ◽  
Xin Rong Zeng ◽  
Yi Wang ◽  
Yi Fu Zhang
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Synthesis And Characterization ◽  
Formaldehyde Resin ◽  
Isophorone Diisocyanate ◽  
Solvent Resistance ◽  
Uv Curable ◽  
H Nmr ◽  
Resistance Tests

A kind of UV-curable cyclohexanone-formaldehyde resins (UVCF) was prepared by the reaction of cyclohexanone-formaldehyde resin (CFR), isophorone diisocyanate (IPDI) and 2-hydroxyethyl acrylate (HEA). The UVCFIPID-HEA obtained was characterized by fourier transform infrared spectrum (FTIR), nuclear magnetic resonance (NMR). The FTIR and 1H-NMR results show that the terminal acrylate acyloxy was introduced into the structure of the prepolymer. The results of solvent resistance tests show that the solvent resistance property of UVCFIPID-HEA is excellent.

The effect of silica/polyurethane waterborne dispersion on the perforating features of impregnated polypropylene-based fabric

2019 ◽  
Vol 90 (11-12) ◽  
pp. 1201-1211 ◽  
Author(s):  
A Patti ◽  
D Acierno
Keyword(s):  
Infrared Spectroscopy ◽  
Weight Gain ◽  
Unit Area ◽  
Waterborne Polyurethane ◽  
Strength Increase ◽  
Cutting Resistance ◽  
Electron Scanning Microscopy ◽  
Dynamometer Machine ◽  
Polyurethane Dispersions ◽  
Puncture Strength

In an attempt to improve the puncturing behavior of a commercial technical textile, this study investigated the effects of fabric impregnation with waterborne polyurethane dispersions (WPUDs). The infusing solutions were prepared by mixing a commercially available WPUD with other components, such as water, hydrophilic and hydrophobic silica (SiO2) nanoparticles, and a crosslinker. Quasi-static perforation tests were performed on a dynamometer machine equipped with a spherical spike and pointed blade as piercing probes. The results showed that the polyurethane impregnation augmented the puncture performances of the treated textiles. Then, further improvements in the spike and blade strength of the impregnated fabrics were obtained by adding hydrophilic silica nanoparticles and crosslinker into WPUDs, respectively. No effect of silica functionalization (hydrophilic or hydrophobic) has been verified on the mechanical features of the respective treated samples for the tested filler contents of 3% and 5% in wt. The best fabric features (blade strength increase of +63% and puncture strength increase of +71% compared to the neat material) were obtained by combining the two additives, nano SiO2 and crosslinker, into the polyurethane. The performances of these last systems were also superior to those obtained by doubling the amount of polymeric dispersion applied to the neat materials. The discussion of the results was supported by electron scanning microscopy, infrared spectroscopy, and further measurements of the cutting resistance. Finally, the mass per unit area of the substrate for the impregnated samples was measured in order to assess weight gain due to treatment.

scholarly journals PLA/PHA-Biodegradable Blends for Pneumothermic Fabrication of Nonwovens

2016 ◽  
Vol 16 (3) ◽  
pp. 119-127 ◽  
Author(s):  
Krzysztofa Szuman ◽  
Izabella Krucińska ◽  
Maciej Boguń ◽  
Zbigniew Draczyński
Keyword(s):  
Mechanical Properties ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Chemical Structure ◽  
Wide Spectrum ◽  
Physical And Mechanical Properties ◽  
Polymer Composition ◽  
Attenuated Total Reflectance ◽  
Total Reflectance ◽  
The Fourier Transform

Abstract This study presents the results of research concerning fabrication of nonwovens from biodegradable polymer blends using the melt-blown method. The experiments performed within the framework of the research confirmed the possibility of obtaining polymer composites based on polylactide (PLA) with poly(hydroxyalkanoates) (PHA) and another aliphatic-aromatic copolyester. The obtained products were subjected to the analyses of chemical structure using the Fourier Transform Infrared Spectroscopy(FTIR) Attenuated Total Reflectance(ATR) method. The physical and mechanical properties of the fabricated nonwoven layers were also tested, which confirmed a wide spectrum of their applicability, depending on the polymer composition used in production.

Water resistance of the membranes for UV curable waterborne polyurethane dispersions

2007 ◽  
Vol 59 (4) ◽  
pp. 331-336 ◽  
Author(s):  
Chen Yan Bai ◽  
Xing Yuan Zhang ◽  
Jia Bing Dai ◽  
Chu Yin Zhang
Keyword(s):  
Water Resistance ◽  
Waterborne Polyurethane ◽  
Uv Curable ◽  
Polyurethane Dispersions

UV-curable waterborne polyurethane dispersions modified with a trimethoxysilane end-capping agent and edge-hydroxylated boron nitride

2019 ◽  
Vol 16 (5) ◽  
pp. 1479-1492 ◽  
Author(s):  
Huixiang Liu ◽  
Hong Zhang ◽  
Chaohua Peng ◽  
Shufan Ren ◽  
Conghui Yuan ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Waterborne Polyurethane ◽  
Capping Agent ◽  
Uv Curable ◽  
End Capping ◽  
Polyurethane Dispersions

Design and preparation of UV-curable waterborne polyurethane based on novel fluorinated chain extender

2020 ◽  
Author(s):  
Changli Shan ◽  
Chuang Ning ◽  
Jingjie Lou ◽  
Wei Xu ◽  
Yingqiang Zhang
Keyword(s):  
Waterborne Polyurethane ◽  
Chain Extender ◽  
Uv Curable

Influence of Chemical Structure on Wetting Property of Down Fibers

2013 ◽  
Vol 843 ◽  
pp. 70-73
Author(s):  
Jing Gao
Keyword(s):  
Contact Angle ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Chemical Structure ◽  
Fourier Transform Infrared ◽  
Surface Chemical ◽  
Wetting Property

Fourier transform infrared spectroscopy was used to investigate the chemical structure of down fibers in this paper. Contact angle was calculated to determine the wetting property of down. Experiments demonstrated that the surface chemical structure affected the fiber wetting property strongly. The surface substance by FTIR was forecast to be the mixture of sterol and triphosphate ester. After Soxhlet-extracted the fibers contact angle increased greatly.

scholarly journals Detection, Purification and Elucidation of Chemical Structure and Antiproliferative Activity of Taxol Produced by Penicillium chrysogenum

Molecules ◽  
2020 ◽  
Vol 25 (20) ◽  
pp. 4822
Author(s):  
Ashraf El-Sayed ◽  
Gamal Enan ◽  
Abdul-Raouf Al-Mohammadi ◽  
Ahmed H. Moustafa ◽  
Nashwa El-Gazzar
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Penicillium Chrysogenum ◽  
Chemical Structure ◽  
Uv Spectroscopy ◽  
Structural Formula ◽  
Culture Conditions ◽  
Potato Dextrose Broth ◽  
Taxol Production ◽  
Rate Limiting

Penicillium chrysogenum has been reported as a potent taxol producer based on quantitative analysis by TLC and HPLC. The biosynthetic potency of taxol has been validated from PCR detection of rate-limiting genes of taxol synthesis such as taxadienesynthase and 10-de-acetylbaccatin III-O-acetyltransferase (DBAT), which catalyzes the immediate diterpenoid precursor of the taxol substance, as detected by PCR. Taxol production by P. chrysogenum was assessed by growing the fungus on different media. Potato dextrose broth (PDB) was shown to be the best medium for obtaining the higher amount of taxol (170 µg/L). A stepwise optimization of culture conditions necessary for production of higher amounts of taxol was investigated. The substance taxol was produced optimally after 18 d of incubation at 30 °C in PDB adjusted initially at pH 8.0 with shaking (120 rpm) (250 µg/L). The P. chrysogenum taxol was purified successfully by HPLC. Instrumental analyzes such as Fourier transform infrared spectroscopy (FTIR), ultraviolet (UV) spectroscopy, 1HNMR and 13C NMR approved the structural formula of taxol (C47H51NO14), as constructed by ChemDraw. The P. chrysogenum taxol showed promising anticancer activity.

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