• Composites Research
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• 제35권2호
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• pp.115-119
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• 2022

탄소섬유의 성능은 탄소 섬유 강화 플라스틱(CFRP)과 같은 고품질 고분자 복합재료에 매우 중요하다. 이를 위해 탄소섬유 물성에 큰 영향을 주는 전구체 섬유의 기계적, 물리적, 구조적 특성을 개선할 수 있는 최적화된 방사공정과 이를 위한 적합한 전구체 공중합 고분자를 사용하는 것은 필수적이다. 본 연구에서는 메타크릴산(MAA)의 함량과 주입시간, 2,2'-아조비스(2-메틸프로피오니트릴) (AIBN)의 농도를 합성공정 변수로 설정하였으며, 용액 중합법(solution polymerization)에 의해 Poly(AN-co-MAA)가 합성되었다. 305,138 g/mol의 분자량과 4.2%의 MAA 비율을 가지는 Poly(AN-co-MAA)를 N,N-디메틸포름아미드(DMF)에 16.0 wt% 농도로 용해시킨 후 기격습식방사법(dry-jet-wet spinning)으로 전구체 섬유를 제조하였다. 섬유의 인장강도는 ~1.06 GPa, 인장탄성률은 ~22.01 GPa였으며, 섬유에서의 공극 및 구조적 결함은 관찰되지 않았다.

• 한국응용과학기술학회지
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• 제27권4호
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• pp.508-514
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• 2010

Regenerated cellulose fibers were prepared from three pulps containing different degree of polymerization(DP) and $\alpha$-cellulose contents by dry-jet wet spinning technique with cellulose dope in N-methylmorpholin N-oxide (NMMO). The effect of antioxidant, n-propyl gallate (PG) on the properties of different regenerated celluloses was studied using X-ray diffraction, copper number calculation, and viscometry. The degradaqtion of regenerated cellulose from pulp containing higher DP and lower $\alpha$-cellulose content was occurred more seriously. The tensile strength and initial modulus of regenerated cellulose fiber obtained from NMMO dope with PG were higher than those of fiber obtained from NMMO dope without PG. All fibers showed the round shape cross section and typical cellulose II crystalline structure.

• 한국염색가공학회지
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• 제20권3호
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• pp.31-38
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• 2008

Regenerated composite fibers were prepared from solution of styela clava tunics(SC) and poly vinyl alchol(PVA) using N-methylmorpholine-N-oxide(NMMO)/water(87/13)(wt%/wt%) as a solvent by dry jet-wet spinning. Structure and physical properties of regenerated composite fibers were investigated through birefrngence, x-ray diffratograms, tenacity, fibrillation and SEM. Optimal blend ratio of SC/PVA for mechanical properties of composite fibers was 70/30 and total weight was 4wt% concentrations in NMMO/$H_2O$ solvent system. Crystallinity index of composite fibers were decreased as the PVA contents increased. Fibrillation of $10{\sim}20wt%$ PVA blended fibers were occurred less than pure SC fiber. Shape of composite fibers were a circle cross section within 10wt% PVA content. But the cross section of fibers were changed as crushed flat with the PVA contents increased.