SCI和EI收录∣中国化工学会会刊

Chin.J.Chem.Eng. ›› 2014, Vol. 22 ›› Issue (3): 339-345.DOI: 10.1016/S1004-9541(14)60046-X

• CHEMICAL ENGINEERING THERMODYNAMICS • Previous Articles     Next Articles

In-situ Observation of the Growth of Fibrous and Dendritic Crystals in Quasi-2-dimensional Poly(ethylene oxide) Ultrathin Films

ZHOU Yuan, HAN Xia, LIU Honglai, HU Ying   

  1. Key Laboratory for Advanced Materials and Department of Chemistry, East China University of Science and Technology, Shanghai 200237, China
  • Received:2012-11-18 Revised:2013-03-18 Online:2014-03-05 Published:2014-03-28
  • Contact: HAN Xia
  • Supported by:

    Supported by the National Natural Science Foundation of China (21176065, 21136004), the 111 Project (B08021) and the Fundamental Research Funds for the central Universities of China.

In-situ Observation of the Growth of Fibrous and Dendritic Crystals in Quasi-2-dimensional Poly(ethylene oxide) Ultrathin Films

周圆, 韩霞, 刘洪来, 胡英   

  1. Key Laboratory for Advanced Materials and Department of Chemistry, East China University of Science and Technology, Shanghai 200237, China
  • 通讯作者: HAN Xia
  • 基金资助:

    Supported by the National Natural Science Foundation of China (21176065, 21136004), the 111 Project (B08021) and the Fundamental Research Funds for the central Universities of China.

Abstract: Crystal growth processes of poly(ethylene oxide) were followed from the original nucleation sites by using atomic force microscopy. Two distinct quasi-2-dimensional crystals about 4 nm thick were obtained from as-spun polymer ultrathin films: fibrous crystals, generated by the shearing field via spin-coating, coexist with conventional dendrites. The growth of the two structures is dominated by diffusion limited aggregation, though the growth rate of the fibrous crystals is around one order of magnitude faster than that of the dendrites. The fibrous crystals are more stable than the dendritic ones.

Key words: polymer crystallization, crystal pattern formation, atomic force microscopy, poly(ethylene oxide)

摘要: Crystal growth processes of poly(ethylene oxide) were followed from the original nucleation sites by using atomic force microscopy. Two distinct quasi-2-dimensional crystals about 4 nm thick were obtained from as-spun polymer ultrathin films: fibrous crystals, generated by the shearing field via spin-coating, coexist with conventional dendrites. The growth of the two structures is dominated by diffusion limited aggregation, though the growth rate of the fibrous crystals is around one order of magnitude faster than that of the dendrites. The fibrous crystals are more stable than the dendritic ones.

关键词: polymer crystallization, crystal pattern formation, atomic force microscopy, poly(ethylene oxide)