本研究以trioctylphosphine oxide (TOPO)和 trioctylphosphine (TOP)作為界面活性劑，Fe(CO)5為前驅物，以熱裂解方式合成Fe2P磁性奈米柱，此奈米柱再分別與均聚物 poly (2-vinylpyridine) (P2VP)和poly (styrene-b-2-vinylpyridine) (PS-b-P2VP)進行混摻形成複合材料。藉由改變複合材料系統中的條件，研究Fe2P奈米柱在複合材料的排列行為。
在奈米柱/P2VP複合材料的研究中，未加磁場時，奈米柱主要是以反向的平行排列為主，而其平行排列的結構則受到奈米柱長度、粒子添加量、P2VP分子量的影響。長度為20 nm之奈米柱在低粒子添加量下，為零散分佈P2VP中，在高粒子添加量下呈平行排列，而P2VP分子量的提高也會使平行排列現象較明顯。外加磁場時，由於磁性奈米柱與磁場之間的作用力，使奈米柱平行於磁場方向，呈一鏈狀排列，而磁場強度的提高使奈米柱的方向性越明顯，部份的鏈狀排列甚而進一步形成網狀結構。
在奈米柱/PS-b-P2VP複合材料的研究中，由於未改質的奈米柱表面殘留的TOPO層與共聚物的高分子皆不相容，故低粒子添加量下即形成奈米柱的聚集，並影響周圍共聚物的層狀結構。藉由熱迴流方式以pyridine改質奈米柱表面，改善奈米柱在共聚物中的聚集。長度為20 nm以pyridine改質的奈米柱在低粒子添加量下，奈米柱在共聚物中的位置與角度皆有一選擇性，其位置大部分皆位於P2VP層，而其角度則受到P2VP鏈的形態熵(conformational entropy)影響，使其方向平行於高分子層。以pyridine改質的40 nm和100 nm之奈米柱，由於其尺寸緣故，在低粒子添加量下就形成聚集，並使共聚物的層狀結構轉變成扭曲層狀(modulated lamellae)。

Fe2P nanorods were prepared by thermalysis. using trioctylphosphine oxide (TOPO) and trioctylphosphine (TOP) as surfactants, and Fe(CO)5 as a precursor. As prepared nanorods were mixed with poly(2-vinylpyridine) (P2VP) and poly (styrene-b-2-vinylpyridine) (PS-b-P2VP), respectively, to prepare composites. We change different experimental conditions to investigate the behavior of nanorods in these composties.
In nanorod/P2VP composites, nanorods formed raft-like arrangement with anti-parallel particle pairs. The length of nanorods, particle loading, and the molecular weight of P2VP affect the rod arrangement. At low particle loading (rod length= 20 nm), nanorods dispersed uniformely in P2VP. In contrast, nanorods formed a raft-like structure at high particle loading. The raft-like arrangement was more obvious with increasing molecular weight of P2VP. With an applied magnetic field, the interaction between magnetic nanorods and magnetic field force nanorods to align parallel to the magnetic field, forming a chain-like structure. As increasing the magnetitude of magnetic field, increased more nanorods formed a chain-like structure, inducing a network structure.
In nanorod/PS-b-P2VP composites, the residu TOPO on the surface of nanorods exhibited poor compatibility with both PS and P2VP. This caused the aggregation of nanorods at low particle loading and hance destroying the lamellae structure of PS-b-P2VP around them. Using the reflux with pyridine to modifiy nanorod surface, the dispersion of nanorods in PS-b-P2VP weas improved. The pyridine modified nanorods (20 nm) were sequestered in P2VP domains and aligned along the PS and P2VP. This particular orientation of nanorods was induced by the conformational entropy. As the length of nanorods increased, the aggregation of nanorods were formed at low particle loading, causing a structure transition of PS-b-P2VP from lamellae to modulated lamellae.

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