Relationship between mechanical properties and flame retardancy in halogen-free sandwich structures based on PET foams and glass fiber-reinforced epoxide resins

基于 PET 泡沫和玻璃纤维增​​强环氧树脂的无卤夹层结构机械性能与阻燃性的关系

• 批准号: 278300368
• 负责人: Professor Dr.-Ing. Volker Altstädt
• 金额: --
• 依托单位: Lehrstuhl für Polymere Werkstoffe
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/278300368?language=en
• 关键词: Relationship; between; mechanical; properties; flame

Sandwich structures, consisting of a cellular polymer core and thin compact skin layers, are gaining increasing relevance as structural materials since they combine a low density with a relatively high strength. Sandwich materials based on polyethylene terephthalate (PET) foams were introduced only a few years ago. These structures are innovative materials with outstanding shear and compressive strength. However, they have the disadvantage of being flammable compared to other foam materials. This undesired flammability must be overcome by adding flame-retardant additives to PET. Concerning flame-retardant PET-based sandwich materials, the relationship between the microscopic morphology of both the foam core and the skin layer phases on the structure mechanical properties and fire resistance has not been systematically investigated. The aim of this project is to investigate and clarify the mentioned structure-property relationship and set the foundations on the knowledge on materials science for further improvement of these materials. The selected materials composing the sandwich materials are foam-extruded PET as the core and a high-performance glass-fiber reinforced epoxy resin as skin layer. These sandwich structures will be obtained by Vacuum Assisted Resin Infusion (VARI). The flame retardancy of PET foams will be improved through a novel additivating concept. This concept consists on introducing in PET phosphorous- and sulfur-based compounds having synergetic flame retardant properties. The epoxy resin will be also additivated with phosphorous-based compounds to improve its flame retardant properties. These compounds will not affect the resin processability for VARI infusion nor its ultimate mechanical properties. To understand the influence of both phases on the overall properties of the sandwich material, the core and skin layers will be studied separately. As such, all relevant material and process parameters for PET foam extrusion can be investigated. The effect of the foam extrusion parameters on the foam microstructure will be herein elucidated. Afterwards, the influence of the flame-retardant additives on the foam morphology will be investigated. Then, the relationship between the foam morphology on the mechanical properties and fire resistance will be established. Finally concerning the sandwich structures, the surface interactions between the core and the skin layer will be investigated and then related to the mechanical properties and fire resistance of the sandwich. Especial attention will be paid to the fire resistance of halogen-free flame-retardant sandwich samples, with the fire-retardant mechanisms of such structures being elucidated. For this joint research project, the scientific competences of UBT (material science) and TUD (flame retardants) are optimal for a research collaboration.

由多孔聚合物芯和薄而致密的表层组成的三明治结构作为结构材料越来越重要，因为它们结合了低密度和相对高的强度。基于聚对苯二甲酸乙二醇酯 (PET) 泡沫的夹层材料仅在几年前推出。这些结构是具有出色剪切和压缩强度的创新材料。然而，与其他泡沫材料相比，它们具有易燃的缺点。必须通过在 PET 中添加阻燃添加剂来克服这种不良的可燃性。对于阻燃PET基夹层材料，泡沫芯材和表层相的微观形貌与结构力学性能和耐火性之间的关系尚未得到系统研究。本项目的目的是调查和阐明上述结构与性能的关系，为进一步改进这些材料奠定材料科学知识的基础。构成夹芯材料的所选材料以发泡挤出PET为芯，高性能玻璃纤维增​​强环氧树脂为表层。这些夹层结构将通过真空辅助树脂灌注（VARI）获得。 PET 泡沫的阻燃性将通过新颖的添加剂概念得到改善。这一概念包括在 PET 中引入具有协同阻燃性能的磷基和硫基化合物。环氧树脂还将添加磷基化合物以提高其阻燃性能。这些化合物不会影响 VARI 灌注的树脂加工性能及其最终机械性能。为了了解两相对夹层材料整体性能的影响，将分别研究芯层和表层。因此，可以研究 PET 泡沫挤出的所有相关材料和工艺参数。本文将阐明泡沫挤出参数对泡沫微观结构的影响。随后，将研究阻燃添加剂对泡沫形态的影响。然后，建立泡沫形态对机械性能和耐火性之间的关系。最后，关于夹层结构，将研究芯层和表层之间的表面相互作用，然后将其与夹层的机械性能和耐火性联系起来。将特别关注无卤阻燃夹层样品的耐火性，并阐明此类结构的阻燃机制。对于这个联合研究项目，UBT（材料科学）和 TUD（阻燃剂）的科学能力是研究合作的最佳选择。

项目成果

Development of a Bead Foam from an Engineering Polymer with Addition of Chain Extender: Expanded Polybutylene Terephthalate

• DOI: 10.1021/acs.iecr.8b04799
• 发表时间: 2018-12-19
• 期刊: INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
• 影响因子: 4.2
• 作者: Standau, Tobias;Haedelt, Bianca;Altstaedt, Volker
• 通讯作者: Altstaedt, Volker

Properties of bead foams with increased heat stability made from the engineering polymer polybutylene terephthalate (E-PBT)

由工程聚合物聚对苯二甲酸丁二醇酯 (E-PBT) 制成的具有更高热稳定性的珠状泡沫的特性

• DOI: 10.1063/1.5142954
• 发表时间: 2019
• 作者: Tobias Standau;Peter Schreier;Kathrin Hilgert;Volker Altstädt
• 通讯作者: Volker Altstädt

Flame retardant polyester by combination of organophosphorus compounds and an NOR radical forming agent

• DOI: 10.1002/app.47876
• 发表时间: 2019-05
• 期刊: Journal of Applied Polymer Science
• 影响因子: 3
• 作者: Daniela Goedderz;Lais Weber;D. Markert;Alexander Schiesser;C. Fasel;R. Riedel;V. Altstädt;C. Bethke;O. Fuhr;Florian Puchtler;J. Breu;M. Döring