Effects of spatial confinement and selective distribution of CB particles on the crystallization behavior of polypropylene
Effects of spatial confinement and selective distribution of CB particles on the crystallization behavior of polypropylene
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DOI：
10.1002/app.35032
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发表时间：
2012-03
影响因子：
3
通讯作者：
Lan-peng Li;Jiafu Wei;B. Yin;Ming‐bo Yang
中科院分区：
文献类型：
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作者：
Lan-peng Li;Jiafu Wei;B. Yin;Ming‐bo Yang
研究了炭黑（CB）颗粒的选择性分布和空间约束对等规聚丙烯(iPP)/聚苯乙烯(PS)/CB复合材料结晶行为的影响。采用差示扫描量热法（DSC）、偏振光显微镜（PLM）和扫描电镜（SEM）研究了复合材料的结晶行为和形貌。结果表明：PP/PS/CB（55/45/1）复合材料呈现典型的共连续结构，CB颗粒分布在PS相中，符合界面张力理论；与PP/CB复合材料相比，在PP/PS/CB中，CB颗粒的选择性分布大大减弱了成核对PP结晶过程的影响。此外，PP/PS/CB复合材料的共连续结构形态对PP的结晶行为有很大影响，这意味着PP的结晶过程必须在连续PS相形成的微米尺度空间限制中进行。等温结晶过程中，空间约束下PP的球晶径向生长速率低于整齐PP，总结晶活化能（ΔE）和成核参数（Kt）的结果表明，共连续结构下排列成晶的PP链段的活化能高于整齐PP。©2011 Wiley期刊公司应用高分子学报，2012
The effects of selective distribution of carbon black (CB) particles and spatial confinement on the crystallization behavior of isotactic polypropylene (iPP)/Polystyrene (PS)/CB composite were studied. The crystallization behaviors and the morphologies of the composite were studied by differential scanning calorimetry (DSC), polarized light microscope (PLM), and scanning electron microscopy (SEM). The results indicated the typical cocontinuous structure appeared in PP/PS/CB (55/45/1) composite, and CB particles are distributed in PS phase, which follows the theory of interfacial tension. Compared with PP/CB composite, the nucleation effect of CB particles on the crystallization process of PP in PP/PS/CB was greatly weakened by selective distribution. Moreover, the morphologies of cocontinuous structure, which means that the crystallization process of PP had to take place in the micron-scale spatial confinement formed by continuous PS phase, greatly influenced the crystallization behavior of PP in PP/PS/CB composite. The spherulite radial growth rate of PP in spatial confinement was lower than that of neat PP during isothermal crystallization processes, and the results of the total crystallization activation energy (ΔE) and the nucleation parameter (Kt) implied that in comparison to neat PP, the activation energy of PP chain segments arranged into crystal was higher in composite with cocontinuous structure. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012