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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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邻位取代基对芳基杂环磷酸盐成核有效性的影响
DOI: 10.11777/j.issn1000-3304.2015.14383, PP. 602-609
Keywords: 成核剂,芳基杂环磷酸盐,等规聚丙烯,成核有效性,结晶行为
Abstract:
以2,4-二叔丁基苯酚为原料分别合成2,2'-亚甲基双(4,6-二叔丁基苯基)磷酸钠(NA-1)和2,2'-亚甲基双(4-叔丁基苯基)磷酸钠(NA-2),并将其应用于等规聚丙烯(iPP),研究该类芳基杂环磷酸盐成核剂邻位取代基对其成核有效性的影响.通过红外吸收光谱(FTIR)、核磁共振谱(NMR)、X-Ray多晶粉末衍射(XRD)、扫描电镜分析(SEM)和热分析对其化学结构、凝聚态结构、颗粒形貌和物性特征进行了表征,确定了NA-1和NA-2的分子结构和凝聚态颗粒的结构、形貌和物性特征.利用偏光显微观察(POM)、扫描电镜(SEM)断口分析、示差式扫描量热分析(DSC)和雾度测试分析对其与iPP的复合材料的晶粒结构、结晶行为及宏观光学性能进行测试表征.结果表明,添加量0.2%时,邻位叔丁基(NA-1)的存在可使复合材料球晶尺度更加细密,结晶温度比无邻位叔丁基(NA-2)增加5.1K,等温结晶速率提高至0.56w/g是NA-2的7倍,半结晶时间由NA-2的11.55min下降至2.36min,邻位叔丁基存在对材料透光率和雾度值的影响分别达到4.3%,7.4%.SEM断口分析表明二者在iPP基体中分散均匀,平均粒径相近分别为0.79μm和0.82μm,粒径分布曲线相近,二者分散分布的差异性不显著.
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