Abstract
Following results were obtained for the mechanical degradation of polystyrene (for polystyrene itself and when blended with rubber) by roll mastication. 1) The rate of mechanical degradation for polystyrene itself can be represented by the second-order rate equation proposed by Goto. $-\frac{dP_t}{dt} = k_s(P_t-P_{\infty})^2$ Where Pt is the degree of polymerization of the degraded polymer at t minutes and $P{\infty}$ is the final degree of polymerization. 2) The mechanical degradation of polystyrene component in the polystyrene-rubber (SBR, BR) blend system occurred similarly as that of polystyrene itself. 3) Under the experimental conditions the mechanical degradation rate of the polystyrene component of the polystyrene-rubber, (SBR, BR) blend system followed approximately the same second-order equation as that for polystyrene itself.
Roll을 사용한 mastication에 의한 polystyrene(단독시와 rubber와의 blend시)의 기계적 분열에 대하여 검토한 결과는 다음과 같다. 1) Polystyrene 단독시의 기계적 분열속도는 Goto가 밝힌 중합도$(P_t-P_{\infty})$에 관하여 2차인 다음식에 적합함을 알았다. $-\frac{dP_t}{dt} = k_s(P_t-P_{\infty})^2$2 2)Polystyrene-rubber (SBR, BR) blend계에서 polystyrene성분의 분열은 단독시와 비스하게 일어났다. 3)본 실험 조건하에서 polystyrene-rubber (SBR, BR) blend계에서, polystyrene성분의 분열속도도 단독시와 같이 상기한 2차식에 근사적으로 적합됨을 알았다.