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Preparation and Characterization of Polystyrene/Layered Double Hydroxide Nanocomposites

Author: HuYuJun
Tutor: BaoYongZhong
School: Zhejiang University
Course: Chemical Engineering
Keywords: Polystyrene Hydrotalcite Situ intercalation polymerization Crystallization / in situ polymerization Nanocomposites
CLC: TB383.1
Type: Master's thesis
Year: 2006
Downloads: 263
Quote: 2
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Abstract


Polymer layered nano inorganic materials composite is to improve the material is heat-resistant, barrier and mechanical properties of the effective ways. Hydrotalcite (LDH) is a novel layered nano inorganic material with polymer composite modification effect, not only can play a similar montmorillonite heat barrier, but also improve the thermal stability of the material (especially chlorine polymer), weather resistance, antimicrobial resistance, and has broad application prospects. For the electrostatic interaction between the hydrotalcite layer nano-laminate peeling difficult characteristics, this paper Preparation of polystyrene (PS) / LDH nanocomposites, explore the situ polymerization of polymer / LDH nanocomposites Characterization of the new method, and the structure and properties of the composite material prepared by different methods. Situ intercalation polymerization of styrene / hydrotalcite (St / LDH), papers haplotype intercalating agent and initiator on styrene sulfonate (VBS) formulations intercalating agent 4,4 '- azo - double (4 - cyanovaleric acid) (ACP) alone or a combination of both modification of intercalation LDH. VBS, ACP or VBS / ACP intercalation of LDH the VBS and ACP nitrate-type LDH water phase at room temperature ion exchange reaction. IR, element, and a differential scanning calorimetry analysis of the structure of LDH intercalation modified by X-ray diffraction (XRD) and found that a high the VBS, ACP or VBS / ACP intercalation efficiency the intercalation were maintained VBS double bond polymerization characteristics and ACP triggered activity. VBS, ACP and VBS / ACP intercalated LDH suspended St situ intercalation polymerization, XRD, TEM characterization of LDH polymer intercalation and exfoliation and dispersion characteristics. Found that the partial peeling LDH composite material to VBS inserted layer LDH prepared; separate ACP interpolation layer LDH after polymerization LDH interpolation layer peeling effect, the dispersion of large size; the VBS / ACP intercalation LDH, polymerization LDH exfoliation and dispersion of the best the LDH sheet thickness of the composite resin after melt processing is small, the portion to the single one layer exists. Paper also crystallization / situ suspension polymerization Synthesis of PS / LDH nanocomposites LDH crystallization in this method, and St polymerization carried out at the same time, simplifying the preparation process of the PS / LDH nano composite resin, so that the time of preparation shortened. Found that using a composite material prepared by the method of LDH in nanometer scale short sheet layer is preferably dispersed in the PS. Intercalation paper situ polymerization and the crystallization / in situ polymerization get PS / thermal stability and rheological properties of LDH nanocomposite were characterized found that of nanocomposites thermal stability than pure PS significantly improved, the same weightlessness, the thermal decomposition temperature is increased with the increase in LDH levels, and the peeling degree of dispersion; Nanocomposites glass transition temperature slightly higher than the pure PS, and increased with the increase of the LDH content;

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