梳狀超分子共聚物摻合均聚物之形態研究

Study on the morphology of supramolecular poly(styrene-block-4-vinylpyridine)(3-pentadecylphenol)/ homopolystyrene blends

李家豪(Chia-Hao Lee)

指導教授 ： 童世煌

國立臺灣大學/工學院/高分子科學與工程學研究所/碩士(2010年)

https://doi.org/10.6342/NTU.2010.10012

摘要

均聚物與共聚物的混摻是一種改良高分子材料性質的有效分式。在本論文中，我們首先探討均聚物polystyrene(hPS)與團聯式共聚物polystyrene-b-poly(4- vinylpyridine)(PS-b-P4VP)的混摻，在hPS與團聯式共聚物中的PS分子量差異極大的情況下，會產生hPS與PS-b-P4VP之間的巨觀相分離，其中以PS-b-P4VP為主的相會因PS與P4VP不相容，另外形成微觀相分離，其形態是由PS與P4VP的組成決定。我們進一步在系統中加入小分子加入3-pentadecylphenol(PDP)，PDP會與P4VP產生氫鍵，形成梳狀超分子共聚物，不僅能改變PS與P4VP的組成，還會因PS/P4VP(PDP)與P4VP/PDP相分離尺度的不同而產生等級(hierarchical)結構。
本研究主要是討論PDP添加量(x)，對於hPS與PS-b-P4VP混摻系統中微觀相分離的形態影響。加入少量的PDP時，P4VP(PDP)還不足以成為球狀形態。增加PDP的添加量，形態變為圓柱，且巨觀向分離變成凸透鏡狀。加入更多的PDP，則圓柱兩端相連產生特殊的U形結構。而加入過多的PDP，P4VP(PDP)圓柱排列的規整性隨PDP添加量的增加而降低。此外，我們也探討了揮發速率以及溶劑對本實驗的影響，並觀察改用另一小分子Dodecylbenzene sulfonic acid(DBSA)接枝的情況。

關鍵字

混摻 ； 超分子 ； 等級性 ； 梳狀 ； 凸透鏡狀

並列摘要

The blending of block copolymer/homopolymer is a good strategy to improve the properties of polymeric materials. In this thesis, we first studied the binary mixtures of poly(styrene-block-4-vinylpyridine)(PS-b-P4VP) and homopolystyrene(hPS), in which macrophase separation, i.e. the phase separation between hPS and PS-b-P4VP, occurs due to the large difference of molecular weight between hPS and PS-b-P4VP. In addition, the microphase separation between PS and P4VP occurs in the PS-b-P4VP-rich phase and the morphology of microphase separation is controlled by the volume fraction of the PS and P4VP block. We then further incorporated 3-pentadecylphenol(PDP) into the system, which can form hydrogen bonds with the 4VP and transforms PS-b-P4VP into supramolecular PS-b-P4VP(PDP). The supramolecules can self-assemble into hierarchical structure-in-structure morphologies and the morphologies can be tailored by the amount of PDPs.
Our research focused on how the amount of PDP affects the morphology of microphase separation in the PS-b-P4VP/hPS blend systems. Spherical microdomains can be obtained at the small amount of PDP. When the amount of PDP is increased, the shape of PS-b-P4VP macrodomains becomes lenslike, in which cylindrical microdomains are packed hexagonally. An unusual U-shape structure, which links two cylinders on the edges of macrodomains, can be observed when the amount of PDP is increased further. In the large excessof PDP, though microdomains remain cylindrical, the regularity of cylinders appear to decrease. In addition, we will discuss how solvents and solvent evaporation rate affect the system. Moreover, we added dodecylbenzene sulfonic acid(DBSA) instead of PDP into PS-b-P4VP/hPS blends and examined the effects of different type of small molecules on the morphology.

並列關鍵字

blend ； supramolecule ； hierarchical ； styrene-block ； self-assemble

參考文獻

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