웨어러블 패키징용 Polydimethylsiloxane (PDMS) 신축성 기판의 강성도 변화거동
Variation of Elastic Stiffness of Polydimethylsiloxane (PDMS) Stretchable Substrates for Wearable Packaging Applications
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초록
웨어러블 패키징용 신축성 기판을 개발하기 위해 투명한 PDMS인 Sylgard 184와 검정색 PDMS인 Sylgard170에 대해 base/curing agent 혼합비에 따른 탄성계수의 변화거동을 분석하였다. Sylgard 184와 Sylgard 170의 공칭응력-공칭변형률 곡선에서 구한 공칭탄성계수에 비해 진응력-진변형률 관계로부터 구한 진탄성계수가 2배 이상 높았으며, 진탄성계수와 공칭탄성계수의 차이는 PDMS의 강성도가 높아질수록 증가하였다. Sylgard 184에서는 base/curing agent의혼합비가 10일 때 탄성계수의 최대값을 얻을 수 있었으며, 이때 공칭탄성계수는 1.74 MPa, 진탄성계수는 3.57 MPa이었다. Sylgard 170에서는 base/curing agent 혼합비가 2일 때 탄성계수가 최대가 되었으며, 이때 공칭탄성계수와 진탄성계수는 각기 1.51 MPa와 3.64 MPa이었다.
Abstract
In order to develop stretchable substrates for wearable packaging applications, the variation behavior of elasticmodulus was evaluated for transparent PDMS Sylgard 184 and black PDMS Sylgard 170 as a function of the base/curingagent mixing ratio. Both for Sylgard 184 and Sylgard 170, the true elastic modulus evaluated on a true stress-true straincurve was higher more than two times compared to the engineering elastic modulus obtained from an engineering stressengineeringstrain curve, and their difference became larger with increasing the stiffness of the PDMS. Sylgard 184exhibited a maximum engineering elastic modulus of 1.74 MPa and a maximum true elastic modulus of 3.57 MPa at thebase/curing agent mixing ratio of 10. A maximum engineering elastic modulus of 1.51 MPa and a maximum true elasticmodulus of 3.64 MPa were obtained for Sylgard 170 at the base/curing agent mixing ratio of 2.
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