Preparation and Properties of Biobased, Cationic, Waterborne Polyurethanes Dispersions from Castor Oil and Poly (Caprolactone) Diol

Biobased cationic waterborne polyurethanes (WPUs) were prepared using isophorone diisocyanate (IPDI), N-methyl diethanolamine (N-MDEA), polycaprolactone (PCL) diol, hydrochlotic acid (HCl), and 1,4-butanediol (BDO). To improve the mechanical performance and adhesive strength of the waterborne polyurethane films, different amounts of castor oil (CO) acting as a cross-linking agent were incorporated in the polyurethane structure. The structures of the waterborne polyurethanes were assessed by Fourier-transform infrared spectroscopy (FTIR). The combination of CO had a positive effect on the dispersion and stability properties of WPUs. WPUs containing higher content of CO demonstrated a remarkable enhancement in homogeneity among particles. The stable aqueous dispersion was obtained even when N-MDEA loading was as low as 3.2 wt%; a bonus of this low hydrophilic moiety was the excellent adhesive strength, whose T-peel strength could reach up to 36.8 N/25 mm, about 114% higher than that of WPU (17.2 N/25 mm) without any CO content. The elongation at break of CO7.40%-WPU was 391%. In addition, the fracture mechanism of the waterborne polyurethane films transformed from the brittle failure to the ductile fracture. The experiment results showed the CO-modified WPUs displayed excellent film-forming property, flexibility, and adhesion, which can be employed for constructing the eco-friendly, biodegradable, cationic, waterborne polyurethanes.

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Influence of the 2,2-Dimethylol Propionic Acid Content on the Structure-Properties of Waterborne Polyurethane

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.476-478.2116 ◽

2012 ◽

Vol 476-478 ◽

pp. 2116-2121 ◽

Cited By ~ 1

Author(s):

Zheng Xiang Wang ◽

Jian Long Wang ◽

Li Zheng Gu

Keyword(s):

Propionic Acid ◽

Waterborne Polyurethane ◽

Peel Strength ◽

Scanning Calorimetry ◽

Elongation At Break ◽

Waterborne Polyurethanes ◽

Fourier Transformed Infrared Spectroscopy ◽

Lower Elongation ◽

Dimethylol Propionic Acid ◽

Structure Properties

Abstract. Series waterborne polyurethane (WPU) dispersions with different 2,2-dimethylol propionic acid (DMPA) content were synthesized by the prepolymer method. Different configurations in the waterborne polyurethanes were obtained by varying the DMPA content. The structure-properties of the WPU dispersions were characterized by Fourier transformed infrared spectroscopy, Thermogravimetric analysis, differential scanning calorimetry, Zetasizer nano etc. The results indicated that the amount of urethane and urea groups (hard segment) increased in the structure of WPU chains with the increasing content of DMPA. In the meantime, the degree of micro-phase separation increased. On the other hand, as the content of DMPA increased, the particle size, the thermal stability and T-peel strength decreased. Moreover, the increased content of DMPA resulted in higher tensile strength and hardness, but lower elongation at break.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.955-959.88 ◽

2014 ◽

Vol 955-959 ◽

pp. 88-91 ◽

Cited By ~ 1

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.

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Preparation and Characterization of Castor Oil-Based Cationic Waterborne Polyurethane

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1090.3 ◽

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.

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Biodegradable cationic waterborne polyurethanes from poly(caprolactone)diol and trimethylol propane monooleate

Journal of Applied Polymer Science ◽

10.1002/app.51622 ◽

2021 ◽

pp. 51622

Author(s):

Ying Li ◽

Jun Shen ◽

Siqi Zhang ◽

Weidong Wang ◽

Yu Chen ◽

...

Keyword(s):

Waterborne Polyurethanes ◽

Poly Caprolactone ◽

Trimethylol Propane

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Novel Microstructures in Microwave Sintered Silicon Nitride

MRS Proceedings ◽

10.1557/proc-430-151 ◽

1996 ◽

Vol 430 ◽

Cited By ~ 1

Author(s):

M. E. Brito ◽

K. Hirao ◽

M. Toriyama ◽

M. Hirota

Keyword(s):

Grain Size ◽

Silicon Nitride ◽

Size Distribution ◽

Grain Size Distribution ◽

Mechanical Performance ◽

Microwave Sintering ◽

Preliminary Results ◽

Nitride Ceramics ◽

Positive Effect ◽

Sintered Silicon

AbstractPreliminary results on microwave sintering of seeded silicon nitride show that a well defined bi-modal grain size distribution is attainable in Si3N4-Y2O3-Al2O 3-MgO sintered bodies by microwave sintering at 28 GHz of materials seeded with ß-Si3N4 particles (2 vol. %). A positive effect on the mechanical performance is anticipated for these microstructurally controlled silicon nitride ceramics

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Synthesis and Properties of Waterborne Polyurethane (WBPU)/Modified Lignin Amine (MLA) Adhesive: A Promising Adhesive Material

10.20944/preprints201608.0102.v1 ◽

2016 ◽

Author(s):

Mohammad Mizanur Rahman ◽

Md. Hasan Zahir ◽

Han Do Kim

Keyword(s):

Adhesive Strength ◽

Weather Conditions ◽

Waterborne Polyurethane ◽

Chain Extender ◽

Mixing Process ◽

Adhesive Material ◽

Lignin Amine ◽

A Chain ◽

Modified Lignin ◽

Adhesive Materials

A series of waterborne polyurethane (WBPU)/modified lignin amine (MLA) adhesives was prepared using modified lignin amine (MLA) as a chain extender by a prepolymer mixing process. A successful Mannich reaction was achieved during the synthesis of MLA by reacting lignin with bis(3-aminopropyl)amine. Higher tensile strength, Young’s modulus and thermal stability were recorded for WBPU/MLA adhesives with higher MLA contents. The WBPU/MLA adhesive materials were used to coat PVC substrates. The adhesive strength increased with increasing MLA content. More importantly, the MLA also enhanced the WBPU/MLA coating in terms of adhesive strength at moderately high temperatures as well as under natural weather exposed conditions. The adhesive strength was essentially unaffected with 6.48 mole% MLA in the WBPU/MLA coating after exposure to natural weather conditions for 180 days.

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