Preparation and Characterization of Castor Oil-Based Cationic Waterborne Polyurethane

2015 ◽  
Vol 1090 ◽  
pp. 3-7
Author(s):  
Kai Liu ◽  
Song Ping Zhang ◽  
Zhi Guo Su ◽  
Guang Hui Ma
Keyword(s):  
Castor Oil ◽  
Hard Segment ◽  
Waterborne Polyurethane ◽  
Gravimetric Analysis ◽  
Waterborne Polyurethanes ◽  
Hard Segment Content ◽  
Ir Analysis ◽  
Hard Segments ◽  
Polyurethane Dispersions

A variety of castor oil-based cationic polyurethane dispersions (PUDs) were synthesized. The effects of hard segment content on the properties of PUDs and the resulting polyurethane films were investigated by mastersizer, Fourier transform infrared (IR), thermal gravimetric analysis (TGA) and stress-strain test. As the hard segment content increased from 37.1 to 45.6 wt %, the particle size of the PUDs increased from 10 to 190 nm. IR analysis showed that hydrogen bonding between hard segments enhanced with the increase of hard segment content. For this enhancement the films had an increased tensile strength from 2.0 to 9.4 MPa and an improved glass transition temperature (Tg) from 48oC to 75oC. TGA showed the films were thermally stable up to 200oC and had biphasic degradation at around 330oC and 440oC. The versatile castor oil-based cationic waterborne polyurethanes are promising in applications as adhesives and coatings.

New Waterborne Polyurethane Dispersions from the Soybean-Oil-Based Polyols by Ring Opening of ESO with Glycol

2011 ◽  
Vol 197-198 ◽  
pp. 1196-1200
Author(s):  
Kun Peng Wang ◽  
Li Ting Yang
Keyword(s):  
Differential Scanning Calorimetry ◽  
Soybean Oil ◽  
Thermophysical Properties ◽  
Ring Opening ◽  
Hard Segment ◽  
Waterborne Polyurethane ◽  
Hardness Testing ◽  
Scanning Calorimetry ◽  
Hard Segment Content ◽  
Polyurethane Dispersions

A series of polyols (GSOLs) with a range of hydroxyl numbers based on epoxidized soybean oil (ESO) were prepared by ring opening with glycol. These Polyols of hydroxyl (OH) numbers ranging from 111 to 162 mg KOH/g were obtained. The environmentally friendly soybean-oil-based waterborne polyurethane dispersions (SPU) with very promising properties have been successfully synthesized from a series of soybean-oil-based polyols (GSOLs) with different hydroxyl numbers by a polyaddition reaction with toluene 2,4-diisocyanate (2,4-TDI). The structure and thermophysical properties of the resulting SPU films have been studied by Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, and hardness testing. The experimental results showed that the functionality of the GSOLs and the hard segment content play a key role in controlling the structure and the thermophysical properties of the SPU films.

Topography and Wettability of Waterborne Polyurethane Coatings with Varying Amounts of Hard Segments

2013 ◽  
Vol 634-638 ◽  
pp. 3033-3037
Author(s):  
Yu Hong Qi ◽  
Zhan Ping Zhang ◽  
Yan Zhang ◽  
Mei Miao
Keyword(s):  
Laser Scanning ◽  
Hard Segment ◽  
Soft Segment ◽  
Hydrophobic Surface ◽  
Waterborne Polyurethane ◽  
Contact Angles ◽  
Water Contact ◽  
Hard Segment Content ◽  
Fouling Release ◽  
Hard Segments

Topography and wettability plays an important role to fouling release performance of a coating. Surface morphology and water contact angles (WCA) depending on time of three waterborne polyurethane (WPU) coatings were studied by laser scanning microscope and optical contact angle meter. The results show that WPU coatings with low hard segment content are consisted of hard segment domains, soft segment domains and crack-like non-cohesive regions. With increasing hard segment content, nanostructured micro-phase separated topography is easier to forming, and crack-like non-cohesive regions is reduced. A stable hydrophobic surface in the WPU system can be obtained by drying coating at 60C as well as adding hard segment content to improve fouling release performance of the coatings.

Synthesis of waterborne polyurethane dispersions with glycolyzed product from pet waste: Effect of hard segment content on its properties

2015 ◽  
Vol 57 (5) ◽  
pp. 434-443 ◽  
Author(s):  
Congcong Wang ◽  
Jianjun Fang ◽  
Tingting Liu ◽  
Cunlu Ji ◽  
Sufang Li
Keyword(s):  
Hard Segment ◽  
Waterborne Polyurethane ◽  
Pet Waste ◽  
Hard Segment Content ◽  
Polyurethane Dispersions

Rheological Behavior of Environmentally Friendly Castor Oil-Based Waterborne Polyurethane Dispersions

2013 ◽  
Vol 46 (11) ◽  
pp. 4606-4616 ◽  
Author(s):  
Samy A. Madbouly ◽  
Ying Xia ◽  
Michael R. Kessler
Keyword(s):  
Rheological Behavior ◽  
Castor Oil ◽  
Environmentally Friendly ◽  
Waterborne Polyurethane ◽  
Polyurethane Dispersions

Preparation and Application of Undecylenate Based Diol for Bio-Based Waterborne Polyurethane Dispersion

2014 ◽  
Vol 955-959 ◽  
pp. 88-91 ◽  
Author(s):  
Zhe Yang ◽  
Yan Bin Zhu ◽  
Fang Peng ◽  
Chang Qing Fu
Keyword(s):  
Castor Oil ◽  
Room Temperature ◽  
Click Reaction ◽  
Waterborne Polyurethane ◽  
Chain Extender ◽  
Proton Nuclear Magnetic Resonance ◽  
Isophorone Diisocyanate ◽  
Polyurethane Dispersion ◽  
Waterborne Polyurethanes ◽  
Ft Ir

The undecylenate based diol (UAD) has been synthesized from undecylenate by esterification and thiol-ene click reaction sequently, and then it was used as a diol to prepare bio-based waterborne polyurethane (WPU) reacting with isophorone diisocyanate (IPDI) and castor oil-based carboxyl hydrophilic chain extender. The structure of undecylenate based diol was verified by hydrogen proton nuclear magnetic resonance (1H NMR). Fourier transform infrared spectroscopy (FT-IR) was used to characterize the structure of WPU film. Furthermore, particle size and viscosity were used to character apparent properties of the bio-based waterborne polyurethane dispersion. The result shows that: bio-based waterborne polyurethane dispersion is transparent and very stable under room temperature. This work provides a simple and efficient method for the preparation of fatty acids based polyols and bio-based waterborne polyurethanes.

Synthesis and characterization of biodegradable lysine-based waterborne polyurethane for soft tissue engineering applications

2016 ◽  
Vol 4 (11) ◽  
pp. 1682-1690 ◽  
Author(s):  
Hongye Hao ◽  
Jingyu Shao ◽  
Ya Deng ◽  
Shan He ◽  
Feng Luo ◽  
...  
Keyword(s):  
Tissue Engineering ◽  
Wound Healing ◽  
Soft Tissue ◽  
Tissue Repair ◽  
Waterborne Polyurethane ◽  
Synthesis And Characterization ◽  
Soft Tissue Repair ◽  
Waterborne Polyurethanes ◽  
Soft Tissue Engineering

Light-crosslinking waterborne polyurethanes (LWPUs) based on lysine possess appropriate elasticity for soft tissue repair, and can induce macrophages into a wound healing phenotype.

scholarly journals Modification of epoxy resins with thermoplastic segmented polycarbonate-based polyurethanes

2014 ◽  
Vol 68 (6) ◽  
pp. 755-765 ◽  
Author(s):  
Jelena Pavlicevic ◽  
Mirjana Jovicic ◽  
Vesna Simendic ◽  
Oskar Bera ◽  
Radmila Radicevic ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Epoxy Resin ◽  
Hard Segment ◽  
Crosslinking Agent ◽  
Polyurethane Elastomers ◽  
Hard Segment Content ◽  
Weight Content ◽  
Epoxy Curing ◽  
Hard Segments ◽  
Modified Epoxy

In this work, epoxy hybrid materials were synthesized by addition of thermoplastic segmented aliphatic polyurethanes with good elastic properties. The modified epoxy samples were obtained by curing of previously homogenized mixture of prepared polyurethane melts, epoxy resin and crosslinking agent Jeffamine D-2000. The influence of different weight content of polyurethanes (5, 10 and 15 wt. % compared to pure epoxy resin) as well the influence of different hard segments of elastomers (20, 25 and 30 wt. %) on the curing of modified epoxy systems was studied. The curing was followed by differential scanning calorimetry (DSC), in dynamic regime from 30 to 300?C, at three heating rates (5, 10 and 20?C/min). With the increase of hard segments content of polyurethanes added in higher concentration (10 and 15 wt. %) into epoxy matrix, the temperature of maximum ratio of curing was shifted to lower values (from 205 to 179?C). Obtained DSC data were analyzed using two integral methods (Ozawa-Flynn-Wall and Kissinger-Akahira-Sunose) and one differential kinetic model (Friedman). The significant differences were observed in the second part of the epoxy curing (for the reaction degrees higher than 60 %), where the values of activation energies remarkably increase. The addition of polyurethane elastomers retarded the curing process due to decreased mobility of reactant molecules caused by higher viscosity of reaction mixture. By detailed analysis of determined kinetic parameters, it is concluded that the influence of slow diffusion is more pronounced in the presence of thermoplastic polycarbonate-based polyurethanes, which confirmed their effect on the mechanism of epoxy curing. The highest tensile strength and hardness showed the DGEBA modified with the polyurethane with highest hard segment content. Increasing the hard segment content of polyurethane and its concentration in matrix, the tensile strength of modified epoxy was increased. The elongation at break of modified epoxy samples was significantly improved by addition of polycarbonate-based polyurethanes with low hard segment content, due to higher content of flexible soft segment chains.

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