TY - JOUR
T1 - Stretching-induced crystallinity and orientation of polylactic acid nanofibers with improved mechanical properties using an electrically charged rotating viscoelastic jet
AU - Liao, Chia Chun
AU - Wang, Cheng Chien
AU - Chen, Chuh Yung
N1 - Funding Information:
The authors gratefully acknowledge the Center for Micro/Nano Science and Technology and the National Science Council of the Republic of China ( NSC 99-2622-E-006-016-CC3 and NSC 99-2221-E-006-252 ) for their financial support.
PY - 2011/9/1
Y1 - 2011/9/1
N2 - An electrospinning technique with an additional centrifugal field was employed to prepare polylactic acid (PLA) nanofibers. The results indicated that combining the strong stretching force of the additional centrifugal field and an electrostatic field can align the PLA polymer chains parallel to the nanofiber axis, producing PLA nanofibers with superior crystalline features, molecular orientation and conformation as well as good mechanical properties. The optimal stretching force for an electrically charged rotating viscoelastic jet was determined by high-speed videography and the analysis of dimensionless groups (i.e., the Re, We, and Oh numbers). The elastic modulus of PLA nanofibers with a crystallinity degree of 37% and a dichroic ratio (D) of 1.89 was measured at 2.64 GPa and 3.30 GPa by atomic-force microscopy (AFM) and nanoindenter experiments, respectively. Furthermore, the optimal PLA nanofibers produced by the proposed method can potentially be applied for the reinforcement of composites.
AB - An electrospinning technique with an additional centrifugal field was employed to prepare polylactic acid (PLA) nanofibers. The results indicated that combining the strong stretching force of the additional centrifugal field and an electrostatic field can align the PLA polymer chains parallel to the nanofiber axis, producing PLA nanofibers with superior crystalline features, molecular orientation and conformation as well as good mechanical properties. The optimal stretching force for an electrically charged rotating viscoelastic jet was determined by high-speed videography and the analysis of dimensionless groups (i.e., the Re, We, and Oh numbers). The elastic modulus of PLA nanofibers with a crystallinity degree of 37% and a dichroic ratio (D) of 1.89 was measured at 2.64 GPa and 3.30 GPa by atomic-force microscopy (AFM) and nanoindenter experiments, respectively. Furthermore, the optimal PLA nanofibers produced by the proposed method can potentially be applied for the reinforcement of composites.
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U2 - 10.1016/j.polymer.2011.07.031
DO - 10.1016/j.polymer.2011.07.031
M3 - Article
AN - SCOPUS:84862158939
SN - 0032-3861
VL - 52
SP - 4303
EP - 4318
JO - polymer
JF - polymer
IS - 19
ER -