Synthesis and Characterization of Temperature-sensitive Cellulose-graft-Poly(<italic style="font-style: italic">N</italic>-isopropylacrylamide) Copolymers

Li-li Yang; Jin-ming Zhang; Jia-song He; Jun Zhang; Zhi-hua Gan

doi:10.1007/s10118-015-1703-2

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Synthesis and Characterization of Temperature-sensitive Cellulose-graft-Poly(N-isopropylacrylamide) Copolymers

PAPER | Updated：2021-06-21

- Synthesis and Characterization of Temperature-sensitive Cellulose-graft-Poly(N-isopropylacrylamide) Copolymers
- Chinese Journal of Polymer Science Vol. 33, Issue 12, Pages: 1640-1649(2015)
- Affiliations：
  
  a.Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing 100190, China
  b.University of Chinese Academy of Sciences, Beijing 100049, China
  c.State Key Laboratory of Organic-inorganic Composites, Beijing Laboratory of Biomaterials, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
- Author bio：
  
  **Jun Zhang (张军), E-mail: jzhang@iccas.ac.cn
  Zhi-hua Gan (甘志华), E-mail: zhgan@mail.buct.edu.cn
- Funds：
- DOI：10.1007/s10118-015-1703-2
  CLC：
- Received：29 April 2015，
  
  Revised：2015-05-14，
  
  Accepted：17 May 2015，
  
  Published：2015-12
- Accepted：
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Li-li Yang, Jin-ming Zhang, Jia-song He, et al. Synthesis and Characterization of Temperature-sensitive Cellulose-graft-Poly(N-isopropylacrylamide) Copolymers[J]. Chinese Journal of Polymer Science, 2015, 33(12): 1640-1649. DOI: 10.1007/s10118-015-1703-2.
DOI：

Li-li Yang, Jin-ming Zhang, Jia-song He, et al. Synthesis and Characterization of Temperature-sensitive Cellulose-graft-Poly(N-isopropylacrylamide) Copolymers[J]. Chinese Journal of Polymer Science, 2015, 33(12): 1640-1649. DOI: 10.1007/s10118-015-1703-2. DOI：

摘要

Abstract

A new series of cellulose-graft-poly(

-isopropylacrylamide) (cellulose-

-PNIPAM) copolymers were prepared by atom transfer radical polymerization (ATRP) of

-isopropylacrylamide monomers from a cellulose-based macro-initiator

which was homogeneously synthesized in an ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl). The composition of cellulose-

-PNIPAM copolymers could be adjusted by altering the feeding ratio and reaction time. The resultant copolymers with relatively high content of PNIPAM segments (molar substitution of PNIPAM ≥ 18.3) were soluble in water at room temperature. Aqueous solutions of cellulose-

-PNIPAM copolymers exhibited clear temperature-sensitive behavior

and their sol-to-gel phase transition properties were investigated by dynamic light scattering (DLS) and UV measurements. Compared with pure PNIPAM

the cellulose-

-PNIPAM copolymers possessed higher lower critical solution temperatures (LCST) in a range from 36.9 ℃to 40.8 °C

which are close to normal human body temperature

and could be tuned by adjusting the content of PNIPAM segments in copolymers. Spherical structure of cellulose-

-PNIPAM copolymers formed at temperatures above LCST and its morphology was observed by TEM and SEM. These novel cellulose-

-PNIPAM copolymers may be attractive substrates for some biomedical applications

such as drug release and tissue engineering.

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Synthesis and Characterization of Temperature-sensitive Cellulose-graft-Poly(N-isopropylacrylamide) Copolymers

DOI：10.1007/s10118-015-1703-2

摘要

Abstract

关键词

Keywords

references