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Progress in Researches and Applications of Nucleating Agents for Polyethylene Terephthalate |
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Abstract: PET nucleating agents are used to improve the crystal structure, increase the crystallization rate, improve the physical-mechanical properties and shorten the forming period. The most common PET nucleating agents fall into three groups: inorganic nucleating agents, organic nucleating agents and composite nucleating agents. Inorganic nucleating agents including clay (montmorillonite, layered double hydroxide, etc.), metallic oxide (SiO2, MgO, ZnO, TiO2, etc.), non-alkali metal hydroxides (Al(OH)3, Mg(OH)2, etc.) and inorganic salts (Na2CO3, NaHCO3, BaSO4, etc.) are the earliest nucleating agents to be used and enjoy the advantages of being cheap, easy to obtain and easy to be use. They are heterogeneous in PET, and are difficult to disperse uniformly. Organic nucleating agents include organic acid salts (benzoate, sodium formate, sodium acetate, etc.) ionomer and others. They are easy to disperse in the polymer, with good performances. Composite nucleating agents possess both advantages of organic and inorganic nucleating agents. The synergistic effect is obvious and the performances are excellent. Therefore, the composite nucleating agents will become a focus of researches for the mechanism and applications.
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Received: 12 January 2010
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