Crystalline Properties of Poly(ethylene brassylate)

• Other Authors: Song, Daokun (author)
• Format: Others
• Language: English; English
• Published: Florida State University
• Subjects: Chemical engineering
• Online Access: http://purl.flvc.org/fsu/fd/2019_Spring_Song_fsu_0071N_15201

Poly (ethylene tridecanedioate), also known as poly(ethylene brassylate) (PEB), is a long-spaced aliphatic polyester obtained from a renewable source. PEB in a range of molar mass between 27,000 and 188,000 Dalton crystallize rapidly as single peaks at ~55ºC and display three major melting peaks (60 -70ºC). The original crystals melt at ~58°C and further recrystallize and melt again at ~70°C while a different type of crystal forms at the same time and melts at ~65°C. The difference between the various types of crystals formed in PEB is the number of repeating units in the crystal. Differences in the crystal thickness lead to the effect of self-poisoning at the growth front, and hence, to a deep depression in the temperature coefficient of the growth rate at temperatures approaching the melting temperature of the thin crystals from above. This minimum of the rate, first described for n-alkanes, is also observed in the overall crystallization kinetics obtained by DSC, and follows a general behavior of precision polyethylenes that develop different crystalline structures by changing undercooling. === A Thesis submitted to the Department of Chemical and Biomedical Engineering in partial fulfillment of the requirements for the degree of Master of Science. === Spring Semester 2019. === April 15, 2019. === Includes bibliographical references. === Rufina G. Alamo, Professor Directing Thesis; Hoyong Chung, Committee Member; Jingjiao Guan, Committee Member.