1. Presenter :Yu-Cheng Cheng Date:2015/6/11

2. OUTLINE  Introduction  Experimental  Results and discussion  Conclusion 1

3. Introduction  Ultrahigh molecular weight polyethylene (UHMWPE) fiber is a new kind of high performance fiber developed in the recent two decades.  Its distinctive properties are low friction coefficient, high wear resistance, high mechanical properties and, especially high strength can be reached by the UHMWPE fiber due to orientation of its very long polymeric chains. 2

4. OUTLINE  Introduction  Experimental  Results and discussion  Conclusion 3

5. Experimental Materials Experimental Setup Sample Preparation 4

6. Materials  UHMWPE powder  1,2-Dichloroethane  Cyclopentane  Irganox 1010 5

7. Materials  UHMWPE powder  1,2-Dichloroethane  Cyclopentane  Irganox 1010 6

8. Materials  UHMWPE powder  1,2-Dichloroethane  Cyclopentane  Irganox 1010 7

9. Materials  UHMWPE powder  1,2-Dichloroethane  Cyclohexane  Irganox 1010 8

10. Experimental Materials Experimental Setup 9

11. UHMWPE powder Autoclave Cyclohexane Irganox 1010 CO 2 10 O2O2 Steel nozzle

12. OUTLINE  Introduction  Experimental  Results and discussion  Conclusion 11

13. Results and discussion Structural transformation SEM DSC XRD Mechanical properties 12

14. Structural transformation Structural transformation of (a) FS-F and (b) GS-F 13

15. Results and discussion Structural transformation SEM DSC XRD Mechanical properties 14

16. SEM 15 Fig. 2(a) not a single one but a bunch of thinner fibers. Fig. 2(b) with smooth surface, round shape and some crevices could be observed.

17. Results and discussion Structural transformation SEM DSC XRD Mechanical properties 16

18. DSC 17 The melting point of the raw material powder was 142.0 °C.

19. Results and discussion Structural transformation SEM DSC XRD Mechanical properties 18

20. XRD 19 The prominent peaks located at 19.4°, 21.5°, and 23.9°were corresponding to (100), (110) and (200) crystal lattice planes of UHMWPE, respectively.

21. Results and discussion Structural transformation SEM DSC XRD Mechanical properties 20

22. Mechanical properties 21 It can be concluded that the breaking strength and Young׳s modulus of FS-F were significantly lower while the breaking elongation of FS-F was higher than the GS- F׳s.

23. OUTLINE  Introduction  Experimental  Results and discussion  Conclusion 22

24. Conclusion  The UHMWPE microfiber was successfully fabricated by flash-spinning using 1,2-Dichloroethane and cyclopentane as solvent.  The FS-F had lower strength and modulus, which was still higher than most of the other polymer fibers, but higher specific surface area and breaking elongation than the GS-F׳s.  The exactly intrinsic characteristic proved the FS-F to be suitable for various potential applications such as filter, microsensors, protective clothing and so on. 23

25. Thank you for your attention 24