| 학회 |
한국고분자학회 |
| 학술대회 |
2019년 봄 (04/10 ~ 04/12, 부산컨벤션센터(BEXCO)) |
| 권호 |
44권 1호 |
| 발표분야 |
분자전자 부문위원회 I |
| 제목 |
Importance of Critical Molecular Weight of Semicrystalline n-Type Polymers for Producing Highly-Stretchable, Conducting Thin Films |
| 초록 |
Mechanical properties of conducting polymers are an import issue in the field of flexible and stretchable electronics, but fundamental understanding of the polymer structure-mechanical property relationship is still very limited. Here we report systematic investigation on the dependence of mechanical and fracture properties on molecular weight for a well-known n-type conjugated polymer (P(NDI2OD-T2)). By synthetic control, the number average molecular weight (Mn) precisely tuned from 15 to 163 kg mol-1 were prepared. Importantly, the high-Mn thin films (＞ 100 kg mol-1 above the critical molecular weight) exhibited superior mechanical compliance and robustness with the 114-fold enhanced strain at fracture and 2820-fold enhanced toughness, as compared to those based on low-Mn polymers (15 kg mol-1). More importantly, a noticeable increment in mechanical properties were seen between Mn = 48 and 103 kg mol-1, yielding a 26-fold enhanced strain at fracture and 160-fold enhanced toughness. |
| 저자 |
최준형1, 김완선1, 김동욱1, 김선하1, 채준수1, 최시영1, 김선주2, 김택수1, 김범준1
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| 소속 |
1KAIST, 2중앙대 |
| 키워드 |
n-type conjugated polymer; naphthtlene diimide; critical molecular weight; mechanical property; fracture energy
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| E-Mail |
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