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Study on Polypropylene/Intercalated LDHs Nanocomposites

Author: ShiYanQin
Tutor: ZhongMingQiang
School: Zhejiang University of Technology
Course: Materials Science
Keywords: Hydrotalcite (LDHs) Polypropylene (PP) Ion exchange Nanocomposites Crystalline properties Flame retardant properties Mechanical Properties
CLC: TB383.1
Type: Master's thesis
Year: 2009
Downloads: 232
Quote: 3
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Abstract


Article by an ion exchange method, preparation of the sodium dodecyl sulfate-modified hydrotalcite (LDHs2), sodium hydrogen tartrate modified hydrotalcite (LDHs3), itaconic acid-modified hydrotalcite (LDHs4), sodium dodecyl sulfo sodium / itaconic acid modified hydrotalcite (LDHs5) and the sodium dodecyl sulfate / tartaric acid, sodium hydrogen-modified hydrotalcite (LDHs6). The structure and properties of thermal stability, the layer spacing of the various modified hydrotalcite variation. Then optional the unmodified Hydrotalcite (LDHs1) and better overall performance in the modified hydrotalcite the three modified hydrotalcite (LDHs2, LDHs5, LDHs6) Preparation of polypropylene / hydrotalcite nanocomposites. Optional polypropylene F401 (PP1) as the matrix of the composite material, a polypropylene grafted with maleic anhydride (PP-g-(MAH-co-St-)) as a compatibilizing agent, polypropylene K7726 (PP2) as a solution method intercalation agent prepared three types of polypropylene / hydrotalcite nanocomposites. By melt prepared PP1/LDHs (100/3), PP1/PP-g- (MAH-co-St) / LDHs (100/10/3) composite material. Wherein PP-g-(MAH-co-St) prepared by melt-grafting and the graft ratio and crystal properties. By solution intercalation was prepared PP2/LDHs (100/30) masterbatch masterbatch crystalline properties. Preparation of melting PP1/PP2/LDHs (100/10/3) composites. System PP1/LDHs, PP1/PP-g- (MAH-co-St) / LDHs PP1/PP2/LDHs three types of composite materials processing, rheology, crystallization, mechanical, flame-retardant layer spacing structure and properties. The research results show that the five modified hydrotalcite: Five modifiers can be inserted into the hydrotalcite lamellae between the layer spacing has been improved to varying degrees. Which contains sodium dodecyl sulfate-modified hydrotalcite layer larger spacing. Itaconic acid may damage the the Sodium Dodecyl long chain in between the sheet layers of hydrotalcite ordered arrangement of the sodium dodecyl sulfate, sodium hydrogen tartrate can improve long-chain in between the sheet layers of hydrotalcite The orderly arrangement of the itaconic acid can be improved the hydrotalcite hydroxy initial decomposition temperature. The special crystalline properties of a large number of hydrotalcite and PP2 PP2/LDHs masterbatch initial crystallization temperature is lower than that of pure PP2; join hydrotalcite did not play the role of heterogeneous nucleation, but will make the number of heterogeneous nucleation percentage Drop: the cooling rate is slower, and the heat of melting and the relative degree of crystallinity is lower. The PP2/LDHs Masterbatch non-isothermal crystallization kinetics of 15 ° C / min a crucial cooling rate, greater than the drop temperature rate, the Avrami exponent n a turning point, the crystallization rate constant increased greatly reduced, or even reduce. PP1/LDHs PP1/PP-g- (MAH-co-St) / LDHs and PP1/PP2/LDHs of three types of composite processing, rheology, crystallization, mechanical, flame retardant, layer spacing structure and performance comparative studies, the results show that: (1) in these three kinds of composite materials, the grain size of the PP1/PP2/LDHs composites distributed more uniformly, the fastest rate of total crystallinity, a higher percentage of core number heterogeneous; (2 ) containing LDHs5 of the composite material bending strength, flexural modulus, are the best in the similar; (3) of the same specifications sample combustion under aerobic conditions, two phase composite PP1/LDHs of the longer combustion time, wherein PP1/LDHs5 combustor longest time; (4) under anaerobic conditions, PP1/LDHs1, PP1/LDHs5, PP1/LDHs6, the thermal stability than the pure PP1 has greatly improved; (5) is not modified hydrotalcite the spacing of the layers in the composite material does not change, sodium dodecyl sulfate / itaconic acid-modified hydrotalcite peeling state exists in the composite material in order to, sodium dodecyl sulfate, sodium dodecyl sulfate / sodium hydrogen tartrate-modified hydrotalcite the peel - Intercalation state in the composite material exists.

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