화학공학소재연구정보센터
Polymer(Korea), Vol.46, No.6, 805-812, November, 2022
실란 커플링제 첨가에 따른 TPU/EVA/Silica 컴파운드의수분흡수 및 기계적 물성 연구
Effect of Silane Coupling Agent on Water Absorption and Mechanical Properties of TPU/EVA/Silica Compounds
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초록
폴리우레탄(thermoplastic polyurethane, TPU)은 고무 소재의 대체 신소재로 주목받고 있다. 그러나 TPU는 수분 친화성이 높아, 습윤한 환경에 취약하여 상용화의 한계를 지니고 있다. 이를 해결하고자 수분흡수율이 낮고 타 수지와 친화성이 높은 ethylene vinyl acetate(EVA)를 말레산 무수물(maleic anhydride, MAH)이 그라프트된 EVA-g- MAH를 이용하여 블렌드(TPU/EVA)를 제조한다. 하지만 이 경우 기계적 물성이 떨어지는 단점이 있다. 따라서 본 연구에서는 기계적 물성을 보완하고자 실란 커플링제를 이용하여 표면을 개질시킨 실리카 필러를 사용하여 복합체 를 제조하였다(TPU/EVA/Silica). TPU/EVA/Silica의 특성을 분석한 결과, 실란 커플링제로 표면 개질된 실리카 필러가 들어간 컴파운드의 경우 실리카의 분산성이 향상되어 수분 흡수율의 감소와 기계적 특성이 향상되는 결과를 보였다. 그러나, 3 phr 이상의 실란 커플링제가 첨가되었을때 가소제와 같은 역할로 분산성이 저하되고 기계적 물성 의 감소와 수분 흡수율이 증가하는 결과를 확인하였다.
Thermoplastic polyurethane (TPU) is attracting attention as an alternative new material for rubber materials that require excellent physical properties. However, TPU has a high affinity for moisture and is vulnerable to a humid environment, so there is a limit to its commercialization. To solve this problem, ethylene vinyl acetate (EVA), which has a low absorption rate and high affinity with other resins, was blended using maleic anhydride (MAH) grafted EVA(EVA-g-MAH) as compatibilizer (TPU/EVA). But this blend has poor mechanical properties compared to the original TPU. In this study, therefore, a surface-modified silica filler by a silane coupling agent was added to the blend to improve mechanical properties. TPU/EVA with surface-modified silica filler (TPU/EVA/Silica) shows a decrease in moisture absorption and improvement in mechanical properties due to the dispersity of silica particles. When the silane coupling agent was added more than 3phr, the degree of dispersion became worse because it behaved like a plasticizer. As a result, mechanical properties decreased, and water absorption increased.
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