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Design and Investigation of Polyurethane End-Capped Polyesters with Controlled Hydrolytic Stability

Yang, Shaoguang
http://rave.ohiolink.edu/etdc/view?acc_num=akron1407971721

Abstract Details

2014, Master of Science in Polymer Engineering, University of Akron, Polymer Engineering.
The hydrolytic stability of a series of oligoesters comprised of two, three, and four different monomers was compared and investigated. The monomers were selected based on predictive structural effects on the rate of hydrolysis. The oligoesters were prepared from adipic acid (AA), phthalic acid (PA) and isophthalic acid (IPA), with 1,6-hexanediol (16HD), and neopentyl glycol (NPG). The hydroxyl-terminated oligoesters were then end-capped with phenol isocyanate (PI) to eliminate initial end-group effects. Thus, the auto catalysis effect of end-groups at the beginning of hydrolysis can be excluded, allowing the proper evaluation of intrinsic behavior of oligoesters in aqueous systems. Hydrolysis process were monitored by measuring the acid number of oligoesters, acetone and water mixture. Hydrolysis rate constants can be calculated from the plots of acid number vs. time. Based on previous results from Dr. Soucek’s group[2,3], it was observed that quaternary oligoesters had higher hydrolysis rates than ternary oligoesters at ambient temperature at 40¿. In this research, hydrolysis were operated at a relatively high temperature at 60¿ that steric effects and anchimeric effects can have different combination of influence on the hydrolysis rates of oligoesters.
Mark Soucek, Dr. (Advisor)
Sadhan Jana, Dr. (Committee Member)
Younjin Min, Dr. (Committee Member)
71 p.
Chemical Engineering; Engineering; Polymer Chemistry; Polymers
Oligoesters, Hydrolysis, steric effects, anchimeric effects

Recommended Citations

Citations

  • Yang, S. (2014). Design and Investigation of Polyurethane End-Capped Polyesters with Controlled Hydrolytic Stability [Master's thesis, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1407971721

    APA Style (7th edition)

  • Yang, Shaoguang. Design and Investigation of Polyurethane End-Capped Polyesters with Controlled Hydrolytic Stability . 2014. University of Akron, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1407971721.

    MLA Style (8th edition)

  • Yang, Shaoguang. "Design and Investigation of Polyurethane End-Capped Polyesters with Controlled Hydrolytic Stability ." Master's thesis, University of Akron, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1407971721

    Chicago Manual of Style (17th edition)

akron1407971721
2,034
© 2014, all rights reserved.
This open access ETD is published by University of Akron and OhioLINK.