Study on Microphase Separation of Waterborne Polyurethane by the Infrared Spectroscopy Peak Fitting

Abstract:

A series of waterborne polyurethane (WPU) with different soft segment structures were sythesised, and the effects of the structure and molecular weight of the soft segment on the degree of PU microphase separation were evaluated by the infrared spectroscopy (FTIR) computer peak fitting. The experiment results indicated that phase separation between hard and soft segments of poly (ether–urethane) was more significant than poly (ester–urethane), based on the qualitative analysis on the N–H stretching region of the FTIR spectrum. And the qualitative analysis on the carbonyl stretching region showed that PU with lower soft segment molecular weight had a higher relative amount of hard segment, and possesses higher microphase separation degree. The addition of polyether soft segment PEG had an internal plasticization by actuating the PCD molecular chain. Therefore, it becomes easier for PU to conduct structure adjustment and increased the phase separation degree.

• Periodical: Applied Mechanics and Materials (Volumes 548-549)
• Pages: 164-171
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.548-549.164
• Online since: April 2014
• Authors: Man Zhao, Wen Cai Xu, Shi Yong Luo
• Keywords: Hydrogen Bonding, Infrared Spectroscopy Peak Fitting, Microphase Separation, Polyurethane

References

[1] Datye K V, Raje, H M , Sharma N D. Poly(ethylene terephthalate) waste and its utilisation: A review. Resources and Conservation, 1984, 11(2): 117-141.

DOI: 10.1016/0166-3097(84)90015-4

[2] Pilch-Pitera B, Król P, Pikus S. Supramolecular structure of crosslinked polyurethane elastomers based on well-defined prepolymers. Journal of Applied Polymer Science. 2008, 110(5), 3292-3299.

DOI: 10.1002/app.28894

[3] Goering H, Kruger H, Bauer M. Multimodal polymer networks: Design and characterization of nano-heterogeneous PU elastomers. Macromolecular Materials and Engineering, 2000, 278, 23-35.

DOI: 10.1002/(sici)1439-2054(20000501)278:1<23::aid-mame23>3.0.co;2-p

[4] Bonart R. X-ray investigations concerning the physical structure of cross-linking in segmented urethane elastomers. Journal of Macromolecular Science, 1968, 2(1): 115-138.

DOI: 10.1080/00222346808212867

[5] Koutsky J A, Hien N V, Cooper S L. Some results on electron microscope investigations of polyether-urethaneand polyester-urethane block copolymers. Journal of Polymer Science, Part B: Polymer Letters, 1970, 8(5): 353~359.

DOI: 10.1002/pol.1970.110080508

[6] Janik H，Palys B，Petrovic Z S. Multiphase- separated polyurethanes studied by micro raman spectroscopy. Macromolecular Rapid Communications, 2003, 24(3): 265-268.

DOI: 10.1002/marc.200390039

[7] Carmberlin, Pascault J P. Phase segregation kinetics in segmented linear polyurethanes: relations between equilibrium time and chain mobility and between equilibrium degree of segregation and interation parameter. Journal of Polymer Science: polymer Physics Edition, 1984, 22(10): 1835-1843.

DOI: 10.1002/pol.1984.180221011

[8] Fesko D G, Tschoegl N W. Time-Temperature Superposition in Styrene/Butadiene/Styrene Block Copolymers International Journal of Polymer Materials, 1974, 3 (1): 51-79.

DOI: 10.1080/00914037408072375

[9] Luo N, Wang D, Ying S K. The affiliation and quantitative analysis of hydrogen bonded bands in PU infrared spectrogram. China Synthetic Rubber Industry, 1995, 18(4): 200-203.

[10] Yilgor I, Yilgor E, Guler I G，Ward T C, Wilkes G L. FTIR investigation of the influence of diisocyanate symmetry on the morphology development in model segmented polyurethanes. Polymer, 2006, 47: 4105-4114.

DOI: 10.1016/j.polymer.2006.02.027

[11] Liu J Z, Zhao P, Gao Y. Influence of the hard-segment content on the structure and properties of segmented polyurea. Journal of East China University of Science and Technology, 2006, 32(10): 1187-1191.

[12] Miao Y. Preparation of polyether polyurethane adhesive and its structure and property. Hefei University of Technology, (2008).

[13] Princi E, Vicini S, Castro K, et al. On the microphase separation in waterborne polyurethanes. Macromolecular Chemistry and Physics, 2009, 210: 879-89.

DOI: 10.1002/macp.200900013

[14] Cakic S M., Ristic I S, Marinovic-Cincovic M, Spırkova M. The effects of the structure and molecular weight of the macrodiol on the properties polyurethane anionic adhesives. International Journal of Adhesion and Adhesives, 2013, 41: 132-139.

DOI: 10.1016/j.ijadhadh.2012.11.001

[15] Tan Z D, Chen Z H, Yang X N. Preparation and characterization of ploy-anionic waterborne polyurethane adhesive. Chemistry and Adhesion, 2007, 29(6): 395-400.

[16] Cakic S M, Spírková M, Ristic I S, B-Simendic J K, M-Cincovic M, Poreba R. The waterborne polyurethane dispersions based on polycarbonate diol: Effect of ionic content. Materials Chemistry and Physics, 2013, 138: 277-285.

DOI: 10.1016/j.matchemphys.2012.11.057

[17] Perez-Liminana M A, Aran-Aisa F, Torro-Palau A M, et al. Characterization of waterborne polyurethane adhesives containing different amounts of ionic groups. International Journal of Adhesion and Adhesives, 2005, 25: 507-517.

DOI: 10.1016/j.ijadhadh.2005.02.002

[18] Princi E, Vicini S, Castro K, et al. On the micro- phase separation in waterborne polyurethanes. Macromolecular Chemistry and Physics, 2009, 210: 879-89.

DOI: 10.1002/macp.200900013

[19] Guo Y, Lan J. Microphase separation of poly (ether-ester) elastomers. China Elastormerics, 2005, 15(1): 65-69.