多相聚合物体系熔体动态过程中相形成与发展——PS/PcBR非相容体系的扫描电子显微镜图样分析  

PHASE FORMING AND DEVELOPMENT OF MULTI-PHASE POLYMER SYSTEMS DURING MELTING ——SEM PATTERN ANALYSIS OF POLYSTYRENE/POLY ( cis-BUTADIENE) RUBBER IMMISCIBLE BLENDS

作　　者：原续波[1] 盛京[1] 李晓战[1] 李加深[1] 蔡志江[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《高分子学报》2001年第2期219-223,共5页Acta Polymerica Sinica

基　　金：国家自然科学重点基金 !(基金号 5 973 3 0 70 )资助项目

摘　　要：以连续共混过程间歇出料法研究了PS/PcBR非相容体系共混过程中的扫描电子显微镜图样演化过程 ,从平均粒径、特征长度Λ和平均特征长度Λm 多个方面讨论了非相容体系的共混过程 ,并以标度函数P(Λ/Λm)证明非相容体系共混过程在一定时间和空间范围内具有自相似性 。The phase forming and development of polystyrene/poly( cis-butadiene) rubber (weight ratios were 70/30 and 50/50, respectively) blends during mixing were investigated by pattern analysis of scanning electron microscope. For the blend with composition 70/30, the average diameter (PDav) of the dispersed phase [particles (PcBR)] decreased in the initial stage of mixing, and fluctuated in the metaphase and later stage. The distribution of the particles trended to uniform with the blending process. But for the blend with composition 50/50, which is near the phase inversion composition, the calculation of PDav is difficult because of the co-continuous structure of the two components, thus two parameters, the characteristic length Lambda and the average characteristic length Lambda (m) are used to characterize the size of the dispersed phase. The characteristic length was defined as the measuring distance of black area (dispersed phase) when scanned the binarized SEM images along a direction. The changes of Lambda (m) was similar to that of PDav, and the Lambda and Lambda (m) could reflect the size and size distribution of the dispersed phase whether or not the composition is near the phase inversion. Furthermore, the histograms of Lambda (m) obtained at various time in the metaphase and later stage of mixing fell on a master curve, demonstrating the self-similar growth of the phase structure. Thus a scale function P (Lambda/Lambda (m)) was defined to study the fractal. behavior of the mixing. The results showed that the fractal dimension D could be used to characterize the mixing process of the polymer blend.

关 键 词：聚合物合金 SEM图样分析 特征长度 分形 聚苯乙烯 顺丁橡胶 共混体系 连续共混过程间歇出料法 

分 类 号：O631[理学—高分子化学]