纳米ZrO2/LLDPE复合材料的非等温结晶动力学
Non-isothermal Crystallization Kinetics of Nano-ZrO2/ LLDPE Composites
摘 要
以纳米氧化锆(ZrO2)作为成核剂改性线性低密度聚乙烯(LLDPE), 采用差示扫描量热仪(DSC)研究了含不同ZrO2质量分数的纳米ZrO2/LLDPE复合材料的非等温结晶行为, 并分析了基于Jeziorny理论和莫志深理论的结晶动力学参数, 利用Kissinger法和Takhor法计算了结晶活化能。结果表明: 纳米ZrO2的加入使结晶速率变慢, 阻碍了晶粒的生长;与LLDPE相比, 当纳米ZrO2质量分数为10%时, 复合材料的活化能降低, 纳米ZrO2在结晶过程中起到异相成核的作用;而纳米ZrO2质量分数为5%时, 复合材料的活化能增大, 纳米ZrO2的异相成核作用不明显。
纳米氧化锆
差示扫描量热分析
非等温结晶动力学
linear low-density polyethylene (LLDPE)
nano-ZrO2
differential scanning calorimetry (DSC)
non-isothermal crystallization kinetics
Abstract
Nano-zirconia (nano-ZrO2) was used as nucleation agent to improve the properties of linear low-density polyethylene (LLDPE). The behaviors of nano-ZrO2/LLDPE composites contenting various mass fractions of ZrO2 were investigated by means of differential scanning calorimetry (DSC) in the non-isothermal crystallization process. Jeziorny and Mo methods were used to analyze the parameters of non-isothermal crystallization kinetics. The activation energies in crystallization were evaluated by Kissinger and Takhor methods. The results demonstrate that the addition of ZrO2 slowed the crystallization rate of LLDPE and restrained the crystal growth. The addition of 10wt% nano-ZrO2 decreased the activation energy of LLDPE, which improved the heterogeneous nucleation during non-isothermal crystallization process of LLDPE. The activation energy of LLDPE increased and heterogeneous nucleation was not obvious for LLDPE with 5wt% of nano-ZrO2.
中图分类号 TQ320.1 TQ315.14
所属栏目 纳米材料
基金项目 河南省安全生产科技发展计划项目(H12-089);河南理工大学博士基金资助项目(B2013-010);国家级大学生创新创业训练计划项目(201210460019)
收稿日期 2012/6/17
修改稿日期 2013/4/29
网络出版日期
作者单位点击查看
备注曹新鑫(1979-), 男, 山西临汾人, 副教授, 博士。
引用该论文: CAO Xin-xin,LUO Si-hai,HE Xiao-fang,YAN Xin-ping,DAI Ya-hui. Non-isothermal Crystallization Kinetics of Nano-ZrO2/ LLDPE Composites[J]. Materials for mechancial engineering, 2013, 37(9): 64～68
曹新鑫,罗四海,何小芳,阎新萍,戴亚辉. 纳米ZrO2/LLDPE复合材料的非等温结晶动力学[J]. 机械工程材料, 2013, 37(9): 64～68
被引情况:
【1】李 翔,张秀香,戴姣燕,张修庆,徐金富, "粉体粒径对氧化锆陶瓷断裂韧性的影响",机械工程材料 40, 75-78(2016)
【2】刘守法,夏祥春,王晋鹏, "搅拌摩擦加工工艺制备ZrO2颗粒增强镁基复合材料的组织与力学性能",机械工程材料 40, 35-38(2016)
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参考文献
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【2】PATIT P K, BISWAS J, KIM H, et al. Influence of film preparation procedures on the crystallinity morphology and mechanical properties of LLDPE films[J].European Polymer Journal, 2003, 39: 1585-1593.
【3】MANAUR A C, MULLER A J. Nucleation and crystallization of blends of polypropylene and ethylene/α-olefin copolymers[J].Macromolecular Chemistry and Physics, 2000, 201: 958-972.
【4】MONTE F D, LARSEN W, MACKENZIE J D. Stabilization of tetragonal ZrO2 in ZrO2-SiO2 binary oxides[J].Journal of the American Ceramic Society, 2000, 83(3): 628-634.
【5】PUOLAKKA K J, JUUTILAINEN S, KRAUSEL A O I. Combined CO2 reforming and partial oxidation of n-heptane on noble metal zirconia catalysts[J].Catalysis Today, 2006, 115(1/4): 217-221.
【6】BARBUCCI A, VIVIANI M, CARPANESE D, et al. Impedance analysis of oxygen reduction in SOFC composite electrodes[J].Electrochimica Acta, 2006, 51(8/9): 1641-1650.
【7】JEZIORNY A. Parameters characterizing the kinetics of the non-isothermal crystallization of poly (ethyleneterephthalate) determined by DSC [J].Polymer, 1978, 19: 1142-1148.
【8】莫志深.一种研究聚合物非等温结晶动力学的方法[J].高分子学报, 2008(7): 656-660.
【9】AVRAMI M. Kinetics of phase change I general theory[J].Journal of Chemical Physics, 1939, 12(7): 1103-1112.
【10】OZAWA T. Kinetics of the non-isothermal crystallization[J].Polymer, 1971, 12(3): 150-158.
【11】KISSINGER H E. Variation of peak temperature with heating rate in differential thermal analysis[J].Journal of Research of the National Institute of Standards and Technology, 1956, 57(4): 217-221.
【12】TAKHOR R. Advances in nucleation and crystallization of glasses;M].Columbus: American Ceramics Society, 1971: 166-172.
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