Moisture cure polyurethane

Moisture cure polyurethanes have been widely used in the [[adhesive]] and coating industries. Thermal, mechanical, and surface properties of hyperbranched polyurethane-urea (HBPU) moisture cured coatings have been studied in relationship to chemical structure.{{cite journal |last1=Mishra |first1=A. K. |last2=Narayan |first2=R. |last3=Raju |first3=K. V. S. N. |title=Structure–property correlation study of hyperbranched polyurethane–urea(HBPU)coatings |journal=Progress in Organic Coatings |volume=74 |issue=3 |year=2012 |pages=491–501 |doi=10.1016/j.porgcoat.2012.01.015}} Different NCO terminated HBPU prepolymers were prepared by reacting hyperbranched polymers with [[isophorone diisocyanate]] (IPDI) or 4,4'-bis-methylene cyclohexane diisocyanate (HMDI). A range of NCO/OH eq. ratios from 1.2 - 1.6 was used.

Moisture cure polyurethanes have been widely used in the [[adhesive]] and coating industries. Thermal, mechanical, and surface properties of hyperbranched polyurethane-urea (HBPU) moisture cured coatings have been studied in relationship to chemical structure.{{cite journal |last1=Mishra |first1=A. K. |last2=Narayan |first2=R. |last3=Raju |first3=K. V. S. N. |title=Structure–property correlation study of hyperbranched polyurethane–urea(HBPU)coatings |journal=Progress in Organic Coatings |volume=74 |issue=3 |year=2012 |pages=491–501 |doi=10.1016/j.porgcoat.2012.01.015}} Different NCO terminated HBPU prepolymers were prepared by reacting hyperbranched polymers with [[isophorone diisocyanate]] (IPDI) or 4,4'-bis-methylene cyclohexane diisocyanate (HMDI). A range of NCO/OH eq. ratios from 1.2 - 1.6 was used.

Thermal and mechanical properties of moisture cured polyurethane-urea /clay nanocomposite coatings have been studied in relationship to clay dispersion and intercalation of clay platelets in the urethane-urea matrix.{{cite journal |last1=Rath |first1=S. K. |last2=Patri |first2=M. |last3=Khakhar |first3=D. V. |title=Structure–thermomechanical property correlation of moisture cured poly(urethane-urea)/clay nanocomposite coatings |journal=Progress in Organic Coatings |volume=75 |issue=3 |year=2012 |pages=264–273 |doi=10.1016/j.porgcoat.2012.05.011}} Coatings were prepared by moisture curing of IPDI capped hydroxyl terminated polybutadiene/clay dispersions in a relative humidity (RH) of 50% at 25 °C. Moisture cured polyurethane–urea coatings have been made by reacting [[1,2,3-triazole]] rich polyether polyols with HMDI at NCO/OH eq. ratio of 1.2 to obtain isocyanate-terminated polyurethane prepolymers. The prepolymers were cured under atmospheric moisture to make polyurethane–urea free films. {{cite journal |last1=Kantheti |first1=S. |last2=Sarath |first2=P. S. |last3=Narayan |first3=R. |last4=Raju |first4=K. V. S. N. |title=Synthesis and characterization of triazole rich polyether polyols using click chemistry for highly branched polyurethanes |journal=Reactive & Functional Polymers |volume=73 |issue=12 |year=2013 |pages=1597–1605 |doi=10.1016/j.reactfunctpolym.2013.09.002 |bibcode=2013RFPol..73.1597K }} Actually, due to the poor mechanical properties caused by the curing method, the MCPU's application is limited. But it is possible to enhance the strength by introducing multiple hydrogen bonds and changing the microphase separation structure.{{Cite journal |last1=Li |first1=Weijie |last2=Yao |first2=Guangxin |last3=Mo |first3=Ruibin |last4=Liu |first4=Weiwei |last5=Jiang |first5=Xiang |last6=Zhang |first6=Xinya |title=Bioinspired Robust Mechanical and Waterproofing Properties of Moisture-Curing Polyurethane With Multiple Hydrogen Bonding Networks |url=https://onlinelibrary.wiley.com/doi/10.1002/app.57112 |journal=Journal of Applied Polymer Science |date=2025 |language=en |volume=142 |issue=27 |article-number=e57112 |doi=10.1002/app.57112 |bibcode=2025JAPS..142E7112L |issn=1097-4628|url-access=subscription }}

Thermal and mechanical properties of moisture cured polyurethane-urea /clay [[nanocomposite]] coatings have been studied in relationship to clay dispersion and intercalation of clay platelets in the urethane-urea matrix.{{cite journal |last1=Rath |first1=S. K. |last2=Patri |first2=M. |last3=Khakhar |first3=D. V. |title=Structure–thermomechanical property correlation of moisture cured poly(urethane-urea)/clay nanocomposite coatings |journal=Progress in Organic Coatings |volume=75 |issue=3 |year=2012 |pages=264–273 |doi=10.1016/j.porgcoat.2012.05.011}} Coatings were prepared by moisture curing of IPDI capped hydroxyl terminated polybutadiene/clay dispersions in a relative humidity (RH) of 50% at 25 °C. Moisture cured polyurethane–urea coatings have been made by reacting [[1,2,3-triazole]] rich polyether polyols with HMDI at NCO/OH eq. ratio of 1.2 to obtain isocyanate-terminated polyurethane prepolymers. The prepolymers were cured under atmospheric moisture to make polyurethane–urea free films. {{cite journal |last1=Kantheti |first1=S. |last2=Sarath |first2=P. S. |last3=Narayan |first3=R. |last4=Raju |first4=K. V. S. N. |title=Synthesis and characterization of triazole rich polyether polyols using click chemistry for highly branched polyurethanes |journal=Reactive & Functional Polymers |volume=73 |issue=12 |year=2013 |pages=1597–1605 |doi=10.1016/j.reactfunctpolym.2013.09.002 |bibcode=2013RFPol..73.1597K }} Actually, due to the poor mechanical properties caused by the curing method, the MCPU's application is limited. But it is possible to enhance the strength by introducing multiple hydrogen bonds and changing the microphase separation structure.{{Cite journal |last1=Li |first1=Weijie |last2=Yao |first2=Guangxin |last3=Mo |first3=Ruibin |last4=Liu |first4=Weiwei |last5=Jiang |first5=Xiang |last6=Zhang |first6=Xinya |title=Bioinspired Robust Mechanical and Waterproofing Properties of Moisture-Curing Polyurethane With Multiple Hydrogen Bonding Networks |url=https://onlinelibrary.wiley.com/doi/10.1002/app.57112 |journal=Journal of Applied Polymer Science |date=2025 |language=en |volume=142 |issue=27 |article-number=e57112 |doi=10.1002/app.57112 |bibcode=2025JAPS..142E7112L |issn=1097-4628|url-access=subscription }}

==References ==

==References ==