Effects of Polymerization and Spinning Conditions on Mechanical Properties of PAN Precursor Fibers

서지정보

ㆍ발행기관 : 한국탄소학회 ㆍ수록지정보 : Carbon Letters / 11권 / 3호
ㆍ저자명 : Qi-feng Qin, Yong-qiang Dai, Kai Yi, L iZhang, Ryu Seung Kon, Ri-

목차

1. Introduction
2. Experimental
3. Results and Discussions
4. Conclusions
References

한국어 초록

PAN precursor fibers were produced via wet-spinning process, and effects of polymerization and spinning processes,
especially the stretching process, were investigated on mechanical properties and micro-morphologies of precursor fibers. An
increase in molecular weight, dope solid and densification and a decrease in surface defects were possible by controlling
polymerization temperature, the number of heating rollers for densification and the jet stretch ratio, which improved the
mechanical properties of precursor fibers. The curves for strength, modulus, tensile power and diameter as a function of
stretch ratio can be divided into three stages: steady change area, little change area and sudden change area. With the increase
of stretch ratio, the fiber diameter became smaller, the degree of crystallization increased and the structure of precursor fibers
became compact and homogeneous, which resulted in the increase of strength, modulus and tensile power of precursor fibers.
Empirical relationship between fiber strength and stretch ratio was studied by using the sub-cluster statistical theory. It was
successfully predicted when the strengths were 0.8 GPa and 1.0 GPa under a certain technical condition, the corresponding
stretch ratio of the fiber were 11.16 and 12.83 respectively.

영어 초록

PAN precursor fibers were produced via wet-spinning process, and effects of polymerization and spinning processes,especially the stretching process, were investigated on mechanical properties and micro-morphologies of precursor fibers. Anincrease in molecular weight, dope solid and densification and a decrease in surface defects were possible by controllingpolymerization temperature, the number of heating rollers for densification and the jet stretch ratio, which improved themechanical properties of precursor fibers. The curves for strength, modulus, tensile power and diameter as a function ofstretch ratio can be divided into three stages: steady change area, little change area and sudden change area. With the increaseof stretch ratio, the fiber diameter became smaller, the degree of crystallization increased and the structure of precursor fibersbecame compact and homogeneous, which resulted in the increase of strength, modulus and tensile power of precursor fibers.Empirical relationship between fiber strength and stretch ratio was studied by using the sub-cluster statistical theory. It wassuccessfully predicted when the strengths were 0.8 GPa and 1.0 GPa under a certain technical condition, the correspondingstretch ratio of the fiber were 11.16 and 12.83 respectively.

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