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首页> 外文期刊>Journal of Applied Polymer Science >High-melt-elasticity poly(ethylene terephthalate) produced by reactive extrusion with a multi-functional epoxide for foaming
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High-melt-elasticity poly(ethylene terephthalate) produced by reactive extrusion with a multi-functional epoxide for foaming

机译：通过反应性挤出用多功能环氧化物产生的高熔融弹性聚（乙二醇酯）用于发泡

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摘要

A multi-functional epoxide oligomer, Joncryl ADR-4368 (ADR), is used as a modifier to prepare foamable poly(ethylene terephthalate) (PET) by reactive extrusion and compared with common tetra-functional modifier pyromellitic anhydride (PMDA) as a reference. Torque evolution reveals that ADR has a faster reaction with PET than PMDA. The reactions generate long-chain branches and gel structures, which are confirmed by rheological methods. Shear rheological studies show that PET modified with both ADR and PMDA display higher complex viscosity and lower loss tangent than unmodified sample. In particular, at a given viscosity level, ADR leads to a lower loss tangent than PMDA. Moreover, compared to PMDA, the addition of ADR results in a higher die pressure during extrusion and a more pronounced strain hardening during uniaxial elongation. These results indicate that ADR-modified PET is less viscous but more elastic than PMDA-modified PET. Owing to the higher elastic properties, ADR-modified PET presents better foaming performance in batch foaming process with CO2 as a blowing agent. (C) 2017 Wiley Periodicals, Inc.
机译：多功能环氧化物低聚物，Joncryl ADR-4368（ADR）用作制备可发泡的聚（乙二醇酯）（PET）通过反应挤出的改性剂，并与常见的四官能改性剂吡罗密酸酐（PMDA）相比作为参考。扭矩进化表明，ADR与PET比PMDA更快。反应产生长链分支和凝胶结构，其通过流变方法确认。剪切流变研究表明，与ADR和PMDA的PET改性，均比未修饰的样品显示出更高的复杂粘度和更低的损耗。特别地，在给定的粘度水平下，ADR导致比PMDA的较低损耗正切。此外，与PMDA相比，在挤出过程中添加ADR导致更高的模具压力和在单轴伸长期间的更明显的应变硬化。这些结果表明ADR改性宠物的粘性较小但更有弹性而不是PMDA改性宠物。由于弹性特性较高，ADR改性PET在批量发泡过程中具有CO 2作为发泡剂的批量发泡方法。 （c）2017 Wiley期刊，Inc。

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