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김아영,엄유신,육지호 한국섬유공학회 2022 Fibers and polymers Vol.23 No.10
A hard coating is generally applied to transparent polymer films in flexible displays to protect the surface fromscratching and abrasion. The degree of improvement of the surface hardness of a polymer film after a hard coating can beincreased, further improving the surface hardness of the polymer film first. This study evaluated the applicability of fumedsilica nanoparticles (FSNs) and mesoporous silica nanoparticles (MSNs) to improve the surface hardness of colorless andtransparent poly(amide-imide)s (CPAIs) films. CPAIs were prepared using monomers with electron-withdrawingtrifluoromethyl groups. CPAI-5 refers to CPAI with an amide linkage content of 50 mol%. The 3H pencil hardness of theCPAI-5 film was increased to 4H by adding 1 % of FSNs without sacrificing their transparency and mechanical properties. The FSNs diffused to the surface of the CPAI-5 films because of their low density and improved surface hardness. On theother hand, when MSNs were added to CPAI-5, the optical transmittance of the CPAI-5 films decreased dramatically. Thepencil hardness of the CPAI-5 film was 6H after a hard coating of ladder-like structured poly(2-(3,4-epoxycyclohexyl)ethylsilsesquioxane) (LPESQ). By contrast, the LPESQ hard coating increased the pencil hardness of the FSNs/CPAI-5composite films to 8H. By improving the surface hardness of the CPAI films first by adding small amounts of FSNs, the finalsurface hardness of the CPAI films after a hard coating could be improved further.
무기 난연제 입자를 포함하는 난연성 모다크릴 섬유의 습식방사
최호원,홍정혁,심재은,엄유신,육지호 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
아크릴로나이트릴(acrylonitrile)과 비닐리덴 클로라이드(vinylidene chloride)가 공중합 된 poly(acrylonitrile-co-vinylidene chloride)(PANVDC)은 우수한 난연성을 가지고 있는 것으로 알려져 있다. 그러나 이러한 PANVDC 섬유도 난연 섬유제품에 요구되는 충분한 난연성능을 갖지 못하여 Al₂(OH)₃, Mg(OH)₂, Sb₂O₃, Sb₂O5, ZnSn(OH)6, ZnSnO₃ 와 같은 무기 난연제를 첨가하여 원사를 제조하여 난연성을 더욱 향상시키고 있다. 본 연구에서는 무기 난연제를 함유한 PANVDC 방사용액의 문제점인 용액점도 상승과 색상 변화를 개선하기 위한 방법을 개발하였으며, 이러한 개선된 방법으로 제조된 PANVDC 방사용액을 습식방사 하여 우수한 난연성의 PANVDC 원사를 제조하고 그 특성을 평가하였다.