| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 가을 (10/13 ~ 10/14, 제주 ICC) |
| 권호 | 30권 2호 |
| 발표분야 | 고분자 가공/블렌드 |
| 제목 | Enhanced Interfacial Adhesion between Polymers by Reactive Compatibilization |
| 초록 | 1. INTRODUCTION Interfacial adhesion between polymers plays a very important role in polymer blends, polymer laminates, composites, and polymer processing. Since most polymer pairs are thermodynamically immiscible, fracture toughness at the interface is very weak due to insufficient interdiffusion. Thus, interfacial enhancement of polymers is required. In this study, we attempted at the next three non-wetting processes to overcome the problems. First process is the method of low-energy Ar+ ion beam irradiation under reactive O2 gas. Second is O2 plasma treatment after low-energy Ar+ ion beam irradiation. Third is only O2 plasma treatment. This vacuum process has the advantages that are environmental affinity not to exist solvent problem and no long time problem, and it is possible to continuous process. So far, much of the fundamental work in the polymer interface has been focused on the interface enhancement between glassy polymers and copolymer, and semicrystalline polymers. Comparatively, much less is known about the mechanical properties of the interface between immiscible semicrystalline polymer and amorphous polymer. In this study, we selected semicrystalline polymer, polyamide (Ny6) and amorphous polymer, polystyrene for experimental system. The chemical reaction with amine group of polyamide (Ny6) was induced by three non-wetting processes on the hydrophobic polystyrene surface. The present work was undertaken to investigate the fracture strength at the interface between surface modified polystyrene and polyamide (Ny6) with annealing time and with bonding temperature, and to determine optimum annealing time and bonding time, and to reveal the underlying change in the fracture mechanism. 2. EXPERIMENTAL The system was composed of a conventional plasma treatment system and a low energy ion beam irradiation system with reactive gas feeding system. For the first process Ar+ ion beam was irradiated on the surface of PS stripes with a reactive O2 gas. The second process was O2 plasma treatment after low-energy Ar+ ion beam irradiation. Above all, Ar+ ion beam was irradiated, and then O2 plasma was treated on the surface of the samples for the predetermined time, respectively. In the case of the third process, we only treated O2 plasma on the specimens. Then, the surface modified PS was clamped with Ny6 stripes in an airtight mold under slight pressure. The mold was heated between by hot press system 190℃ and 230℃. The fracture toughness was measured using an asymmetric double cantilever beam (ADCB) test. 3. RESULT and DISCUSSIONS Fig.1. shows XPS spectra of modified polystyrene with 3-different processes. In case of the C1s peak (A), the intensity of the binding energy of C=O and C-O was the highest at the second process of oxygen plasma treatment after ion beam irradiation. O1s peak (B) indicates that the maximum intensity of the bind- ing energy appeared at the second process. Fig.1. XPS spectra of PS with 3-different processes (A) C1s peaks (B) O1s peaks At the last, The ADCB test for fracture touhjness was undertaken. The plot of the fracture toughness versus the annealing time shows that the optimum annealing time exists for maximum fracture toughness. |
| 저자 | 이지석, 김한성, 서용석, 강태진 |
| 소속 | 서울대 |
| 키워드 | interfacial strength; fracture toughness; surface modification; ion beam irradiation; plasma treatment |
