Citation: Zhi Yan, Lin Ye, Ai-ying Zhang, Zeng-guo Feng. The Mobility of Threaded α-Cyclodextrins in PR Copolymer and Its Influences on Mechanical Properties[J]. Chinese Journal of Polymer Science, ;2017, 35(6): 752-763. doi: 10.1007/s10118-017-1913-x shu

The Mobility of Threaded α-Cyclodextrins in PR Copolymer and Its Influences on Mechanical Properties

Zhi Yan ^a ,
Lin Ye ^a,b,, ,
Ai-ying Zhang ^a,b ,
Zeng-guo Feng ^a,b

a.
School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China
b.
Beijing Key Laboratory of Construction Tailorable Advanced Functional Materials and Green Applications, Beijing 100081, China

Corresponding author: Lin Ye, yelin@bit.edu.cn
Received Date: 1 November 2016
Revised Date: 8 December 2016
Accepted Date: 15 December 2016

Fund Project: This work was financially supported by the National Natural Science Foundation of China 21104005

The methylated polyrotaxane (MePR) copolymer was prepared via the methylation of hydroxyl of threaded α-cyclodextrin (α-CDs) in polyrotaxane (PR) copolymer by CH₃I/NaH. Its structure was characterized by GPC, IR and NMR. The WXRD and TGA measurements showed the destruction of channel-like crystalline structure in MePR copolymer. The sliding of threaded α-CDs along PEG axis in PR and MePR copolymers was demonstrated by their dielectric spectra that also evidenced the presence of rotating of threaded α-CDs around PEG axis in MePR copolymer. The frequent and vigorous molecular mobility in MePR and PR copolymers was also verified by dynamic mechanical analysis (DMA) and rheological measurement, which was possibly assigned to the sliding and rotating of threaded α-CDs. DMA and rheological results showed that the mobility of α-CDs could simultaneously strengthen and toughen PR copolymer proved by stress-stain curves. In this paper, we report the CD mobility in PR and MePR copolymers. The macroscopic behaviors of PR copolymer, such as mechanical properties in solid state, were also found to be benefited from CD mobility.
- PR copolymer,
- Methylation,
- CD mobility,
- Dielectric measurement,
- Mechanical property
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