Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (8): 2643.doi: 10.7503/cjcu20210074

• Polymer Chemistry • Previous Articles     Next Articles

Fabrication of Poly(p-xylene) Nanofiber Arrays by CVD Liquid Crystal Template Method and Their Degradability

XIE Fan(), CHEN Shanshan, ZHUO Longhai, LU Zhaoqing, GAO Kun, DAI Qiyang   

  1. College of Bioresources Chemical and Materials Engineering,Shaanxi Province Key Laboratory of Paper?making Technology and Specialty Paper,National Demonstration Center for Experimental Light Chemistry Engineering Education,Key Laboratory of Paper Based Functional Materials of China National Light Industry,Shaanxi University of Science & Technology,Xi’an 710021,China
  • Received:2021-01-31 Online:2021-08-10 Published:2021-08-05
  • Contact: XIE Fan E-mail:xiefan198903@163.com

Abstract:

Benefiting from the superior biocompatibility and chemical stability of poly(p-xylylene)(PPX), it is of great significance to construct biodegradable PPX nanofiber arrays mimicking extracellular matrix structure in the bioengineering field. To tackle the problems of fabrication and degradation for PPX nanofiber, BMDO/PPX-CH2OH copolymer nanofiber arrays were prepared via chemical vapor deposition(CVD) using liquid crystal as template, 4-hydroxymethyl-p-xylene(PCP-CH2OH) as precursor of poly(4-hydroxymethyl-p-xylene)(PPX-CH2OH) and 5,6-benzo-2-methylene-1,3-dioxyheterocyclic heptane(BMDO) was introduced to copolymerize with PCP-CH2OH to endow the molecular chains with degradable property. The results indicated that PCP-CH2OH was successfully copolymerized with BMDO via CVD approach, and the copolymer nanofiber arrays were obtained. The morphology of the copolymer nanofiber arrays was related to the sample holder temperature and deposition rate, while the mass ratios of BMDO to PCP-CH2OH showed no obvious effect. The optimized CVD process is that the sample holder temperature is about -10 ℃, the deposition rate is about 0.01 nm/s, and the mass ratio of BMDO to PCP-CH2OH is 10∶1. The as-prepared copolymer nanofiber arrays could be degraded effectively in the carbonate buffer solution(0.1 mol/L Na2CO3+0.1 mol/L NaHCO3) at 37 ℃. The ester group in the nanofiber arrays could be decomposed completely after 23 d, and the nanofiber arrays became tiny fragments after 30 d, indicating that the nanofiber arrays were basically completely degraded.

Key words: Poly(p-xylene), Nanofiber array, Chemical vapor deposition, Liquid crystal template, Degra-dability

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