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題名 | 半網狀結構(Semi-IPN)複合乳液顆粒之製備=Study on Semi-IPN Composite Latex Preparation |
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作者 | 王振乾; 林彰泰; 劉孟春; 張家源; Wang, Cheng-chien; Lin, Chang-tay; Chun, Liu-mon; Chang, Chia-yuan; |
期刊 | 嘉南學報 |
出版日期 | 20001100 |
卷期 | 26 2000.11[民89.11] |
頁次 | 頁210-222 |
分類號 | 418.6341 |
語文 | chi |
關鍵詞 | 複合乳液顆粒; 種子乳化聚合; 半網狀高分子; Composite particles; Emulsion polymerization; Semi-IPN polymer; |
中文摘要 | 複合乳液顆粒具有很多種不同型態的結構,為一種用途很廣之複合材料。其可直接使用或加入聚摻合增韌高分子材料中,用以探討橡膠態界面或橡膠態對增韌機構的影響。因此,本文分別利用半批及膨潤兩種兩段式無乳化劑乳化聚合法,配合cumyl hydroperoxide-Fe(II)氧化還原起始劑誘導於油水界面上起始聚合反應,製作不同於一般摻混單成份圓形橡膠顆粒之高分子網狀結構(latex interpenetration network (IPN) particle)的複合顆粒,並利用穿透式電子顯微境(TEM)、流變儀(RDA)、熱分析儀(DSC)等儀器,進行複合顆粒型態的分析。結果發現這些複合顆粒的玻璃轉移溫度(Tg)點變化相當複雜,除了在-45℃及95℃分別有聚丙烯酸丁酯及聚苯乙烯高分子之Tg外,在兩溫度間同時也發現有其它的Tg點。配合TEM圖可發現不管是以半批式"Starve"法或膨潤法所製做出之複合顆粒都有高分子鏈相互交錯式的IPN網狀結構產生。這種以非交鏈型之高分子鏈纏繞己交鏈的高分子鏈之型態屬於Semi 1-IPN。若以半批式法製做複合乳液顆粒時,其結構較簡單,互穿式結構區較小;若以膨潤法製備時,因苯乙烯單體有足夠之時間膨潤己交鏈之聚丙烯酸丁酯種子乳液顆粒,所以其鏈纏繞區較多。若是後段加入的苯乙烯單體量愈多,則聚苯乙烯可與聚丙烯酸丁酯有較大且均勻的鏈纏繞區,其顆粒粒徑會較大且Tg數可減少。這些不同組成的semi 1-IPN複合顆粒將可作為後續 高分子聚摻合改質研究參考。 |
英文摘要 | Composite latex particles are widely used in many material industrials owing to their versatile morphology. Especially for the surface structure of rubber particles in polymer, it is well known as the main point in polymer blend. But the surface structure of rubber particles isn't prior well done within polymer matrix by mechanical mixing in general. Emulsion polymerization is a suitable method to prepare versatile rubber particles, such as core/shell type, for polymer blend. Thus, two-stage emulsion polymerization is employed to prepare composite rubber particles in this investigation. Besides, the interface initiation polymerization from cumyl hydroperoxide-Fe(II) initiator is also applied in this system. Monodisper particle size is obtained from the dynamic light scatterning (DLS) measurement. Uniform particle size can be maintained after secondary step polymerization. Obviously, no new small polystyrene particles are formed in latex. Thus, with the increasing of styrene monomer contained, the particle size is increasing and the polystyrene is distributed in the outer zone of seed latex. This type is belonged to core/shell type latex particle. Furthermore, the properties are charactered by transmitted electron microscopy (TEM), differential scanning calorimeter (DSC) and rheometry dynamic analysis (RDA). There are several glass transition temperatures showed between –45℃ of butyl acrylate homopolymer and 95℃ of polystyrene. Mutli-phase of rubber particle is result from the differential polymerization condition and then the composite rubber particle is belonged to semi 1-IPN (interpenetration network). The more the swelling time and styrene monomer contained in secondary step are, the more polymer chain entanglement zones are. Those composite rubber particles can be applied in polymer blend research in future. |
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