| Budget Amount *help |
¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Research Abstract |
According to the research proposal submitted to the Grant-in-Aid for Scientific Research, firstly, we have designed and constructed a pin-draw instrument which allowed us to draw polymer fibers, tapes, and films under well controlled conditions (draw temperature, draw stress, draw rate, contact length of a polymer sample and the heater). This instrument was first applied to the second-stage drawing of nascent reactor powder of polytetrafluoroethylene (PTFE). A film of PTFE reactor powder, compression molded below the static melting temperature (T_m=335℃), was too brittle to be drawn by a tensile force. However, it is ductile after solid-state coextrusion at slightly below the T_m to a low extrusion draw ratio (EDR) of 6-20. Such extrusion drawn films could be drawn to a DR【less than or equal】50 at a T_d=40-100℃, no draw was achieved at a T_d=100-335℃, and again ultradrawing to a DR=240-500 was possible at a T_d=340-430℃. Such a superdrawn film showed extremely high chain orientation and a large crystallite size along the chain axis (D0015=100-150 nm) and high Young's modulus of 122 GPa at 24℃ (155 GPa at 0℃) which value is the highest ever reported.
This pin draw instrument was also applied to the drawing of ultrahigh molecular weight polyethylene powder, high molecular weight nylon 6, and poly(L-lactic acid) both below and above their static melting temperatures.
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