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首页> 外文期刊>Polymers for advanced technologies >Investigation of morphology and miscibility of isotactic polypropylene, ethylene-butene copolymer and chlorinated polyolefin blends via LSCFM, SEM, WAXD, and DMA
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Investigation of morphology and miscibility of isotactic polypropylene, ethylene-butene copolymer and chlorinated polyolefin blends via LSCFM, SEM, WAXD, and DMA

机译：通过LSCFM，SEM，WAXD和DMA研究等规聚丙烯，乙烯-丁烯共聚物和氯化聚烯烃共混物的形态和可混溶性

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摘要

Thermoplastic olefins (TPOs) are an important class of material used in the automotive industry. They are blends of isotactic polypropylene (iPP) and a polyolefin impact modifier. Chlorinated polyolefin (CPO) is a polymer used as an adhesion promoter to promote the paintability of TPO. The synthesis of a coumarin dye-labeled chlorinated (21.8wt% Cl) maleated polypropylene (CPO), HYdye-labeled MEBR (maleated ethylene-butene copolymer with 28 wt% butene), and CPO (21.8wt% Cl) was described. They were introduced as tracers into iPP/EBR9 (ethylene-butene copolymer with 9wt% butene), iPP/CPO, EBR9/CPO binary, and iPP/EBR9/CPO ternary blends. The annealing effect on morphologies of the blends was examined by laser scanning confocal fluorescent microscopy (LSCFM). LSCFM revealed that the annealing caused phase coarsening in iPP/CPO and iPP/EBR blends, but had no obvious effect on the morphology of EBR/CPO blends, while in iPP/EBR/CPO ternary blends, iPP and EBR formed a completely separate domain, iPP and CPO formed their own domains EBR was distributed in the CPO domains. The morphology of iPP, EBR, and CPO binary blends was further investigated by SEM. SEM images showed that EBR and CPO interpenetrated each other on the nanometer scale in EBR/CPO blends, while obvious phase separation was observed in iPP/CPO and iPP/EBR blends. Differential scanning calorimetry (DSC) and wide angle X-ray diffraction (WAXD) results showed that iPP and EBR, iPP and CPO crystallized respectively in binary blends, while there was a new population of crystals formed in EBR/CPO blend. Further exploration by dynamic mechanical analysis (DMA) revealed that there were two β relaxation transitions in iPP/CPO and iPP/EBR blends, and only one β relaxation transition with a small shoulder in EBR/CPO blends. Thus, we concluded that iPP/EBR and iPP/CPO blends are immiscible; the EBR/CPO blend is miscible in the melt and partially miscible in solid state, which is in agreement with the predictions based on calculations of the results by binary interaction energy density (B{sub}(ij)-B{sub}c).
机译：热塑性烯烃（TPO）是汽车工业中使用的一类重要材料。它们是全同立构聚丙烯（iPP）和聚烯烃抗冲改性剂的混合物。氯化聚烯烃（CPO）是用作增粘剂的聚合物，可提高TPO的可涂性。描述了香豆素染料标记的氯化（21.8wt％Cl）马来酸化聚丙烯（CPO），Hydye标记的MEBR（丁二烯含量为28wt％的马来酸乙烯-丁烯共聚物）和CPO（21.8wt％Cl）的合成。将它们作为示踪剂引入iPP / EBR9（丁烯含量为9wt％的乙烯-丁烯共聚物），iPP / CPO，EBR9 / CPO二元和iPP / EBR9 / CPO三元共混物中。通过激光扫描共聚焦荧光显微镜（LSCFM）检查了退火对共混物形态的影响。 LSCFM显示，退火引起iPP / CPO和iPP / EBR共混物的相变粗大，但对EBR / CPO共混物的形态没有明显影响，而在iPP / EBR / CPO三元共混物中，iPP和EBR形成了一个完全独立的区域，iPP和CPO形成了自己的域EBR分布在CPO域中。通过SEM进一步研究了iPP，EBR和CPO二元共混物的形态。 SEM图像表明，EBR / CPO共混物中EBR和CPO在纳米尺度上相互渗透，而iPP / CPO和iPP / EBR共混物中观察到明显的相分离。差示扫描量热法（DSC）和广角X射线衍射（WAXD）结果表明，iPP和EBR，iPP和CPO分别在二元共混物中结晶，而在EBR / CPO共混物中形成了新的晶体。通过动态力学分析（DMA）进行的进一步研究表明，iPP / CPO和iPP / EBR共混物中存在两个β弛豫转变，而EBR / CPO共混物中只有一个β弛豫具有小的肩峰。因此，我们得出的结论是，iPP / EBR和iPP / CPO混合物是不混溶的。 EBR / CPO共混物在熔体中可混溶，在固态中可部分混溶，这与基于二元相互作用能密度（B {sub}（ij）-B {sub} c）计算结果的预测相符。

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