Synthesis and Characterization of Thermosensitive Magnetic Latex Particle
Date Issued
2004
Date
2004
Author(s)
Chou, Yu-Hui
DOI
zh-TW
Abstract
本研究主要是以兩步驟無乳化劑乳化聚合反應合成具溫度感應性之磁性乳膠顆粒。首先以PAA寡聚物結合傳統的共沈法合成具有Fe3O4奈米微粒的穩定磁性流體，另外以月桂酸(Lauric acid)作為懸浮劑以傳統的共沈法合成出磁性流體後與PAA的系統做比較。反應的第一步先加入苯乙烯(styrene)於磁性流體懸浮液中，而後加入起始劑進行乳化聚合反應合成磁性乳膠微粒，形成磁性流體的第一層包覆，接下來使用具有溫度感應性的NIPAAM及具有-COOH官能基的MAA為單體，加入起始劑，以無乳化劑乳化聚合的方法合成poly（NIPAAM-MAA）的共聚物包覆在Fe3O4/PS微粒之外，形成具有溫度感應性的磁性乳膠微粒。在這裡我們要探討不同懸浮劑及不同起始劑的反應系統對磁性流體的影響、磁性乳膠微粒的穩定性、單體比例、單體濃度、各種反應條件對於乳膠微粒顆粒型態大小、包覆均勻性、反應速率的影響，並且提出反應機制。解釋實驗結果。
In this work, thermosensitive magnetic polymer latex was synthesized by the method of two-step soapless seeded emulsion polymerization. Prior to polymerization, a stable ferrofluid with Fe3O4 nanoparticles was prepared by a traditional co-precipitation method in the presence of PAA oligomer or Lauric acid. In the first step of seeded emulsion polymerization, the ferrofluid acted as seeds, styrene monomer was added into the ferrofluid and then initiator was added to start the polymerization. The magnetic polymer latex particles with the shell of PS were synthesized.
Following the first step of reaction, the second step of polymerization was also carried out by the method of soapless emulsion polymerization with NIPAAM and MAA as thermosensitive and -COOH functional group containing monomers, and KPS or AIBA as initiator. The thermosensitive magnetic latex particles, Fe3O4/PS/poly(NIPAAM- MAA) were thus obtained. The effects of PAA and Lauric acid , the stability of the ferrofluid, the ratio of the monomers and other reaction conditions on the reaction kinetics, the structure, size, and uniformity of the composite latex particles were studied together with the experiment observation.
Subjects
磁性乳膠顆粒
特殊官能基
乳化聚合
溫度敏感性
磁性流體
ferrofluid
temperature sensitivity
nanoparticles
Type
thesis
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