Citation: Jun Wu, Tao-guang Qu, Ling-feng Gao, Xiao-ming Yang, Xiao-hong Li, Ying-feng Tu, Xiu-lin Zhu. Special Odd-Even Effect of Degree of Oligomerization on Properties of Cyclic Oligoesters[J]. Chinese Journal of Polymer Science, ;2015, 33(8): 1069-1073. doi: 10.1007/s10118-015-1675-2 shu

Special Odd-Even Effect of Degree of Oligomerization on Properties of Cyclic Oligoesters

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Suzhou Key Laboratory of Macromolecular Design and Precision Synthesis, Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China

Corresponding author: Ying-feng Tu,
Received Date: 7 April 2015
Revised Date: 4 May 2015

Fund Project: This work was financially supported by the National 973 Project (No. 2011CB606004), the National Natural Science Foundation of China (Nos. 21274099, 21234005 and 21474067), and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

We demonstrate here seven pure cyclic samples, which belongs to two series of oligoesters, cyclic oligo(trimethylene terephthalate)s (COTTs) and cyclic oligo(butylene terephthalate)s (COBTs), showing odd-even effect of degree of oligomerization (repeating units number) on properties. The pentamer of COTT and trimer of COBT show much lower melting temperature, and the trimer of COTT and trimer of COBT show significant lower refractive index, which can be ascribed to the low packing density of cyclic oligoesters with odd number of degree of oligomerization. Our results reveal the discrete property change as a function of cyclic size of oligomers, which can be used to design materials with special properties.
- Cyclic polymer,
- Oligomer,
- Odd-even effect,
- Refractive index
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沈阳化工大学材料科学与工程学院沈阳 110142