Zhang Kai, Fu Guang, Zhou Ying, He Wen-tao, Qin Shu-hao, Yu Jie. The Synergistic Effect of Alkali Metal Salt of Lauric Acid and Aromatic Heterocyclic Phosphate Aluminum on Nucleation of Isotactic Polypropylene. [J]. Acta Polymerica Sinica (10):1431-1438(2016)
DOI:
Zhang Kai, Fu Guang, Zhou Ying, He Wen-tao, Qin Shu-hao, Yu Jie. The Synergistic Effect of Alkali Metal Salt of Lauric Acid and Aromatic Heterocyclic Phosphate Aluminum on Nucleation of Isotactic Polypropylene. [J]. Acta Polymerica Sinica (10):1431-1438(2016) DOI: 10.11777/j.issn1000-3304.2016.16027.
The Synergistic Effect of Alkali Metal Salt of Lauric Acid and Aromatic Heterocyclic Phosphate Aluminum on Nucleation of Isotactic Polypropylene
3种碱金属离子的月桂酸盐(alkali metal salt of lauric acid,AMSLA)为配体,研究了该类复配体系协效诱导等规聚丙烯(iPP)成核作用规律.通过偏光显微观察、示差扫描量热分析、力学性能测试、光学性能测试以及耐热性能表征等手段,研究不同碱金属离子对复合材料结晶结构、结晶行为以及力学性能、光学性能、耐热性的影响.结果表明,LiL、NaL和KL对iPP的成核作用较差,对球晶尺寸的细化不明显,平均尺寸为161 μm,与纯iPP在球晶尺度在同一数量级,结晶温度提高小于6.5℃,成核有效性低于20%,对复合材料力学性能、光学性能及耐热性的改善非常有限;APH-AlOH对iPP的成核作用达到中等水平,晶体尺寸比纯iPP减小了1个数量级,达到16 μm,结晶温度提高13.7℃,成核有效性提高到45.4%,力学性能,光学性能及耐热性同样达到中等水平;LiL、NaL和KL与APH-AlOH复配后对iPP的球晶尺度迅速减小至5 μm以下,比纯iPP球晶尺寸小2个数量级,结晶峰值温度可提高20℃以上,成核有效性高达60%以上,拉伸强度、弯曲强度、弯曲模量平均分别提高15.0%、44.2%、64.0%.雾度值平均下降72.8%,透光率平均增加13.9%,热变形温度平均升高53.8%.AMSLA和APH-AlOH之间表现出极强的协效成核作用,AMSLA中碱金属阳离子对复配体之间的协效成核作用影响对不同性能之间有不同表现,其对结晶峰值温度,力学性能、耐热性能方面的影响表现为Na
three types of alkali metal salt of lauric acid (AMSLA) and their composites were mixed into iPP through melt blending method
respectively.The resultant iPP samples were characterized by polarizing optical microscopy (POM)
differential scanning calorimeter (DSC) and their corresponding properties were also tested.The results showed that the crystallization peak temperature and nucleation efficiency of the iPP samples
prepared with mixed AMSLA and APH-AlOH
were higher than those of the other iPP samples.With taddition of AMSLA alone
the nucleation effect is not significant.The mean size of spherulites maintained the same as that of the raw iPP which is 161 μm.The crystallization peak temperature increases by less than 6.5℃
and the nucleation efficiency is merely 20%.APH-AlOH shows medium nucleation ability on iPP.The mean size of spherulites decreases to 16 μm.The crystallization peak temperature increases by 13.7℃ and the nucleation efficiency is 45.4%.However
when the mixture of AMSLA and APH-AlOH is introduced together
the mean size of spherulites decreases to a size below 5 μm.The crystallization peak temperature increases by more than 20℃ and the nucleation efficiency is higher than 60%.The tensile strength
flexural strength
flexural modulus
heat distortion temperature (HDT) and transmittance of these composites increase by 6.4%
17.3%
18.6%
25.2% and 15.1%
respectively
and the haze decreases by 70.3% compared to iPP matrix.Additionally
the type of alkali metal ions of AMSLA has an obvious effect on the nucleation efficiency of the mixture of AMSLA and APH-AlOH.The crystallization peak temperature
mechanical and heat-resisting properties follows the order of Na
+
>
K
+
>
Li
+
while the optical property follows the order of Li
+
>
Na
+
>
K
+
.
关键词
成核剂等规聚丙烯月桂酸盐芳基杂环磷酸盐协效作用
Keywords
Nucleating agentsIsotactic polypropyleneAlkali metal salt of lauric acidAromatic heterocyclic phosphate salt (AHPS)Synergistic effect
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