Junfang Shen
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Research Interests
Junfang Shen has a total of 4 co-authors. Here are the top co-authors by number of shared publications:
- Jingbo Chen
School of Materials Science and Engineering, Zhengzhou University, Zhengzhou 450001, China
2 shared publications - Junchao An
School of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China
2 shared publications - Junchao An
School of Materials Science and Engineering, Luoyang Institute of Science and Technology, Luoyang 471023, China
2 shared publications - Na Li
School of Intelligent Manufacturing, Luoyang Institute of Science and Technology, Luoyang 471023, China
2 shared publications
Latest Publications
- RetractionOpen Access
RETRACTED: Shen et al. Investigation of the Ordered Structure in Partially Melted Isotactic Polypropylene. Polymers 2021, 13, 3354
- RetractedOpen Access
RETRACTED: Investigation of the Ordered Structure in Partially Melted Isotactic Polypropylene
The ordered structure of partially melted isotactic polypropylene (iPP) was investigated using polarized optical microscopy (POM) and small-/wide-angle X-ray scattering (SAXS/WAXS) measurements. The crystalline morphology was first examined by means of pulling a glass fiber through the iPP melt, which was generated by partially melting a preformed spherulite. The results from the POM experiments indicated that, even at a minimal pulling rate, the surviving ordered structure could also relocate along the direction of fiber pulling and grow into cylindrites eventually. In addition, during the quiescent crystallization from the partially melted sample, which had the same thermal history of fiber-pulling experiments, the obvious memory effect of melt was also observed from the results of X-ray experiments. Moreover, the SAXS profile derived from the partially melted iPP at 170 °C was fitted by the theory of scattering amplitude with the cylindrical form factor. The fit result implied that the surviving ordered structure is of cylindrical nanocrystals with a diameter D ≈ 30 ± 3 nm and height h ≈ 45 ± 3 nm, which can significantly influence the crystallization morphology and kinetics during the subsequent crystallization process.
RetractedOpen AccessRETRACTED: Investigation of the Ordered Structure in Partially Melted Isotactic Polypropylene
The ordered structure of partially melted isotactic polypropylene (iPP) was investigated using polarized optical microscopy (POM) and small-/wide-angle X-ray scattering (SAXS/WAXS) measurements. The crystalline morphology was first examined by means of pulling a glass fiber through the iPP melt, which was generated by partially melting a preformed spherulite. The results from the POM experiments indicated that, even at a minimal pulling rate, the surviving ordered structure could also relocate along the direction of fiber pulling and grow into cylindrites eventually. In addition, during the quiescent crystallization from the partially melted sample, which had the same thermal history of fiber-pulling experiments, the obvious memory effect of melt was also observed from the results of X-ray experiments. Moreover, the SAXS profile derived from the partially melted iPP at 170 °C was fitted by the theory of scattering amplitude with the cylindrical form factor. The fit result implied that the surviving ordered structure is of cylindrical nanocrystals with a diameter D ≈ 30 ± 3 nm and height h ≈ 45 ± 3 nm, which can significantly influence the crystallization morphology and kinetics during the subsequent crystallization process.