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首页> 外文期刊>Journal of Applied Polymer Science >STRUCTURES AND MECHANICAL PROPERTIES OF ZONE-DRAWN ZONE-ANNEALED BLENDS OF COCRYSTALLIZING POLY(BUTYLENE TEREPHTHALATE) AND A POLY(ETHER ESTER)
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STRUCTURES AND MECHANICAL PROPERTIES OF ZONE-DRAWN ZONE-ANNEALED BLENDS OF COCRYSTALLIZING POLY(BUTYLENE TEREPHTHALATE) AND A POLY(ETHER ESTER)

机译：聚对苯二甲酸丁二醇酯和聚醚酯的带区拉延区退火共混物的结构和力学性能

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Poly(butylene terephthalate) (PET) and a poly(ether ester) (PEE) based on PET and poly(ethylene glycol) were melt-blended and extruded as films with quenching. They were then zone-drawn (ZD) and zone-annealed (ZA) at various stresses (between 10 and 50 MPa) at temperatures of 160 and 190 degrees C. The goal was to improve their mechanical properties relative to those of the same blend, but cold-drawn (lambda = 5) and isothermally annealed with fixed ends at the same temperatures for 6 h. All samples were characterized by DSC, WAXS, SAXS, and static mechanical property measurements. In contrast to the isothermally annealed samples, the zone-drawn and zone-annealed ones exhibit one population of crystallites arising from the homo-PBT, as demonstrated by the DSC and SAXS measurements. In addition, however, the WAXS photographic patterns indicate that zone annealing at 190 degrees C results in isotropization of crystallites originating from the PEE, resulting in the formation of a microfibrillar-reinforced composite. It is assumed that some of the isotropic crystallization occurs on preexisting homo-PBT crystallites, i.e., a partial cocrystallization occurs, improving the adhesion between the components of the blend. The structural features created in the zone-drawn-zone-annealed materials result in higher values of the Young's modulus and tensile strength in comparison to the materials receiving the simple isothermal treatment (1,200 vs. 480 MPa and 213 vs. 113 MPa, respectively). (C) 1996 John Wiley & Sons, Inc. [References: 26]
机译：将聚对苯二甲酸丁二醇酯（PET）和基于PET和聚乙二醇的聚醚酯（PEE）进行熔融共混，然后淬火挤出成薄膜。然后在160和190摄氏度的温度下，在各种应力​​（10至50 MPa之间）下对它们进行区域拉伸（ZD）和区域退火（ZA）。目标是相对于相同的共混物改善其机械性能，但进行冷拉（λ= 5），并在相同温度下以固定端等温退火6小时。所有样品均通过DSC，WAXS，SAXS和静态力学性能测量进行表征。与等温退火的样品相反，经DSC和SAXS测量证明，经区域拉伸和区域退火的样品显示出一组由均聚PBT产生的微晶。但是，此外，WAXS摄影图案表明，在190摄氏度下进行区域退火会导致源自PEE的微晶各向同性，从而形成微纤维增强的复合材料。假定某些各向同性结晶发生在预先存在的均聚PBT晶体上，即发生部分共结晶，从而改善了共混物各组分之间的粘合性。与接受简单等温处理的材料（分别为1200 MPa对480 MPa和213 MPa对113 MPa的材料）相比，在区域拉伸区域退火的材料中产生的结构特征导致更高的杨氏模量和拉伸强度值。 （C）1996 John Wiley＆Sons，Inc. [参考：26]

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