在此研究中，我們利用小角度散射儀(GISAXS)、原子力顯微鏡(AFM)、以及光學顯微鏡(OM)鑑定混摻不同分子量之PS-b-P2VP聚(苯乙烯-b-2乙烯吡啶)嵌段共聚物利用氯仿與三氯乙烯溶劑退火之微相結構。在我們使用的三種分子量PS-b-P2VP之中，其中兩種各自會形成層板結構而另一種則會形成圓柱結構。在混摻兩不同分子量PS-b-P2VP互溶的情況下，隨著混摻比例的不同，我們可以發現一系列微相結構的變化，從垂直層板、垂直圓柱、兩相共存到平行圓柱狀。微相結構會隨著混合系統的組成而發生改變。值得注意的是，在不同區間，奈米結構間距及晶格間距與混摻比例會有不同的變化趨勢。而co-surfactant effect與chain-dislodgment這兩個機制，則是主導微相結構與結構尺寸在混合系統中變化的主要原因。

In this work, thin film morphologies of a series of binary blends of two PS-b-P2VP block copolymers (BCPs) under solvent annealing in chloroform and TCE vapor were investigated by grazing-incident small-angle X-ray scattering, atomic force microscopy and optical microscopy. One PS-b-P2VP symmetric BCP forms lamellae and the asymmetric other one form cylinders. As formed as thin films in a miscible state, a series of morphologies, such as perpendicular lamellae, perpendicular cylinders, coexistence of two phases and parallel cylinders, were obtained. The morphologies were found to depend on the compositions of the mixtures. In particular, different trends of lattice distance with composition were found at different constituent regions. Two mechanisms, co-surfactant effect and chain dislodgment, account for the variations in morphology and lattice distance as well as domain size.

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