| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 봄 (04/14 ~ 04/15, 전경련회관) |
| 권호 | 30권 1호, p.216 |
| 발표분야 | 복합재료 |
| 제목 | Tensile Properties and Stress Whitening of Polypropylene/Polyolefin Elastomer/Magnesium Hydroxide Flame Retardant Composites |
| 초록 | Polypropylene (PP) is made nonflammable generally by the use of organo-halogen type fire retardants. This method, however, poses such problems as toxicity of fire retardants, corrosion during melt processing, and emission of smoke and toxic fumes in processing and fires. Therefore much attention has been paid to such fire retardants as aluminum hydroxide (ATH) and magnesium hydroxide (MDH), which are nontoxic and avoid the above-mentioned difficulties. These flame retardants are perhaps the most environmental-friendly flame retardants since both release just water vapor during fire. However ATH begins to dehydrate at about 180 oC and is hence unusable for such thermoplastics resins as PP whose processing temperature is at least about 200 oC. MDH, on the other hand, has the advantage that its decomposition into MgO and H2O starts at a relatively high temperature (300 ~ 320 oC), thus allowing it to be processed in plastics for which ATH is not thermally stable enough. Both ATH and MDH have some drawbacks. To be effective in flame retardancy, high filler loading (60 wt %) is necessary, resulting in a significant loss in mechanical properties, especially in elongation at break and stress whitening in bending deformation. In this stduy, flame retardant polypropylene (PP) composites were prepared by combining random polypropylene with uncoated and surface treated forms of magnesium hydroxide filler and elastomeric modifiers, with and without maleic anhydride functionalization. Four types of magnesium hydroxide (MDH) with different surface treatment were compounded at amount up to 60 % by weight to PP/polyolefin elastomer (POE) matrix resin to obtain a series of composites. The tensile strength and elongation at break were measured. MDH coated with polymeric material was found to give a high elongation at break value as compared with the values obtained with uncoated, vinyl silane and amino silane coated MDH. Two types of POE, i.e., neat and maleic anhydride grafted POE (POEgMA) were used to investigate the stress whitening of composites in bending deformation. POEgMA used composites showed no stress whitening while neat POE used composites showed whitening when bended. |
| 저자 | 홍채환1, 이용범1, 배진우1, 남병욱2, 조재영1 |
| 소속 | 1서울대, 2한국기술교육대 |
| 키워드 | Polypropylene; Magnesium Hydroxide; Flame Retardance; Polyolefin Elastomer |
