等规聚丁烯-1/硬脂酸改性CaCO_(3)纳米粒子复合材料制备与性能研究  

Investigation on preparation and properties of the composites of polybutene-1/steric-modified CaCO_(3) nano particles

作　　者：张斌 李景庆[1] 蒋世春[1] ZHANG Bin;LI Jing-qing;JIANG Shi-chun(School of Materials Science and Engineering,Tianjin University,Tianjin 300350,China)

机构地区：[1]天津大学材料科学与工程学院,天津300350

出　　处：《分子科学学报》2022年第3期225-233,共9页Journal of Molecular Science

基　　金：国家自然科学基金资助项目(51673147,51573131)。

摘　　要：通过双螺杆挤出共混制备了等规聚丁烯-1(iPB-1)/硬脂酸改性CaCO_(3)纳米粒子复合材料,以扫描电子显微镜(SEM)、差示扫描量热法(DSC)、动态流变及拉伸、冲击和弯曲等手段对其结构和性能进行表征,考察了不同含量CaCO_(3)纳米粒子在加入2种不同相对分子质量iPB-1时的影响规律.结果显示CaCO纳米粒子在较低相对分子质量iPB-1中分散较好,所得复合材料的动态流变复数模量、储能模量、损耗模量及复数黏度等动态流变性能以及拉伸强度等力学性能均随CaCO_(3)纳米粒子用量增多而明显增加;而CaCO_(3)纳米粒子在较高相对分子质量iPB-1中分散较差,所得复合材料的动态流变性能和力学性能变化较小甚至没有影响.iPB-1短链因端链作用相对长链在链构象调整时更容易而链活动性更强且缠结弱,对CaCO_(3)纳米粒子填充更敏感;iPB-1长链则主要受链缠结主导限制了其链构象调整能力进而链活动性较低,表现为更“强”的“强流体”特性,进而降低了CaCO_(3)纳米粒子填充敏感性.Via melt-extruding with a twin-screw extruder, a stearic-modified CaCO_(3) nano particles were filled into isotactic polybutene-1(iPB-1) with two selected molecular weights of 274 and 694 kg·mol^(-1)(referred as PB274 and PB694, respectively). The dispersion of CaCO_(3) nano particles with various weight proportions in the composites was estimated by scanning electron microscope(SEM) observations. The melting behaviors of the composites were analyzed by differential scanning calorimetry(DSC) and the dynamic rheological behaviors of the obtained iPB-1/CaCO_(3) composites within the linear viscoelastic region were studied. The mechanical properties including tensile, impact and bending behaviors were examined. The SEM observations revealed that the dispersion of the CaCO_(3) nano particles in the composites with the low molecular weight iPB-1 referred as PB274 tended to be better than that in the composites with the high molecular weight iPB-1 referred as PB694. It indicated that the interactions between the lower molecular weight iPB-1 and the CaCO_(3) nano particles were stronger and thus favored the easier breakup of the aggregates of the CaCO_(3) nano particles while melt-extruding.The DSC results showed that the melting point Tof form Ⅰ of PB694 with high molecular weight is significantly higher than that of PB274 with low molecular weight. The form Ⅰ crystallinity degree Xof PB694 is much smaller than that of PB274. With the CaCO_(3) nanoparticles content increasing, the Tof form Ⅰ in PB274 increased and the Xdecreased, while oppositely, the Tof form Ⅰ in PB694 decreased slightly and the Xincreased slightly. The crystal structure formation of PB274 with low molecular weight was found more dependent on the incorporated CaCO_(3) nanoparticle content. The dynamic rheological behaviors within the linear viscoelastic regions of the composites with lower molecular weight iPB-1 tended to be more sensitive to the CaCO_(3) nano particles content than those for the composites with higher molecular weight iPB-1

关 键 词：等规聚丁烯-1 CaCO_(3)纳米粒子 链活动性 动态流变性能 力学性能 

分 类 号：O631[理学—高分子化学]