Analysis of the bubble building in with blowing agent loaded polymer melts

负载发泡剂的聚合物熔体中气泡形成的分析

基本信息

项目摘要

Foam structure in extrusion foam experiments is analyzed dependent on physical foam agents, on chemical formulation of the modified strain hardening polymer melts and on the process parameters of the extrusion. The correlation of the extensional properties of the polymer melt can be effected with the bubble and structure building only insufficiently, pure qualitatively, because no realible informations exist about the extensional rates in gas bubbles. No selective modification of the polymers can be taken for foam buildings in order to their extensional viscosity and strain hardening for a controlled bubble building process.Based on these rheological and process specific deficits in order to describe the foam processes is necessary the development or a physical and especially rheological based simulation model for a better prediction of the bubble building in for foaming modified polymers. An experimentally verified bubble building model and a rheological constitutive equation, its parameters can be identified on for foaming modified polymer melts using suitable rheometrical measuring systems, shall be taken. The chemically modified PLA-type shall be characterized rheologically by using rotational, capillary and extensional rheometer systems. Extensional viscosity at extensional rates shall be determined, which are relevant for at the bubble rand equibiaxially stretched polymer melt and a diffusion model shall be developed and applied in order to describe the bubble building process during extrusion foaming.Existing models for the bubble building in with blowing agent loaded polymer melts must be enhanced with a time and strain dependent extensional viscosity function and the relation of the extensional viscosity and the strain hardening with the bubble growth shall be taken into account. For this reason the molecular stress function (MSF) model can be applied and its parameters can be determined from uniaxial extensional experiments. The equibiaxial extensional flow in real bubble building process then can be described correctly with this model.
根据物理发泡剂、改性应变硬化聚合物熔体的化学配方和挤出工艺参数,分析了挤出泡沫实验中的泡沫结构。聚合物熔体的拉伸性质的相关性只能用气泡和结构的建立来影响,这是不充分的、纯粹的定性的,因为不存在关于气泡中的拉伸速率的可靠信息。没有选择性的改性的聚合物可以采取泡沫建筑物,以他们的拉伸粘度和应变硬化的一个受控的泡沫建筑过程。基于这些流变学和过程的具体缺陷,为了描述泡沫过程的发展或物理,特别是流变学为基础的模拟模型,以更好地预测泡沫建筑物的发泡改性聚合物是必要的。应采用经实验验证的气泡形成模型和流变本构方程,其参数可通过使用合适的流变测量系统确定。应使用旋转、毛细管和拉伸流变仪系统对化学改性PLA型进行流变特性分析。应测定拉伸速率下的拉伸粘度,为了描述挤出发泡过程中的气泡形成过程,必须发展和应用与气泡兰德等双轴拉伸聚合物熔体相关的扩散模型。现有的含发泡剂的聚合物熔体中气泡形成的模型必须用时间和应变依赖的拉伸粘度函数和扩散模型之间的关系来增强。应考虑拉伸粘度和随气泡增长的应变硬化。为此,可以应用分子应力函数(MSF)模型,其参数可以由单轴拉伸实验确定。该模型能较好地描述真实的气泡形成过程中的等双轴拉伸流动。

项目成果

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Professor Dr.-Ing. Christian Bonten其他文献

Professor Dr.-Ing. Christian Bonten的其他文献

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{{ truncateString('Professor Dr.-Ing. Christian Bonten', 18)}}的其他基金

Automated Optimization of Spiral Shearing and Mixing Elements for Single-screw Extruders
单螺杆挤出机螺旋剪切和混合元件的自动优化
  • 批准号:
    441921604
  • 财政年份:
    2020
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Improved Description of Elongational Flow Behavior During the Processing of Highly Filled Plastics
高填充塑料加工过程中拉伸流动行为的改进描述
  • 批准号:
    435000494
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Calculation of the pellet transportation in grooved feed zones, considering varying conveying mechanisms at high screw speeds
考虑高螺杆速度下不同的输送机制,计算沟槽进料区域中的颗粒输送
  • 批准号:
    423276016
  • 财政年份:
    2019
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Development of a new ternary blend with an outstanding combination of properties
开发具有出色性能组合的新型三元混合物
  • 批准号:
    330226041
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants (Transfer Project)
Three-dimensional Modeling of Plastic Transportation in a Single-screw Extruder - Joint Examination of Feed Zone and Melting Zone
单螺杆挤出机中塑料输送的三维建模 - 进料区和熔融区的联合检查
  • 批准号:
    324934383
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Effects of grooves on processing conditions within grooved plasticizing units in single screw extrusion
单螺杆挤出沟槽塑化装置内沟槽对加工条件的影响
  • 批准号:
    346097498
  • 财政年份:
    2017
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Experimental and numerical qualification of morphology-property-correlations using the method of essential work of fracture (EWF) by the example of polymer blends
以聚合物共混物为例,使用断裂基本功 (EWF) 方法对形态-性质-相关性进行实验和数值鉴定
  • 批准号:
    322212489
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Enhancement of the Folgar-Tucker model to predict filler orientation of filler blends and its application in the process simulation
增强 Folgar-Tucker 模型预测填料共混物的填料取向及其在工艺模拟中的应用
  • 批准号:
    327744866
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Structural elucidation of network effects in highly filled polymers
高填充聚合物中网络效应的结构阐明
  • 批准号:
    316683943
  • 财政年份:
    2016
  • 资助金额:
    --
  • 项目类别:
    Research Grants
Production of a Metal/Plastic Hybrid Structure via Impact Extrusion
通过冲击挤压生产金属/塑料混合结构
  • 批准号:
    263370339
  • 财政年份:
    2015
  • 资助金额:
    --
  • 项目类别:
    Research Grants

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红外尘埃Bubble:大质量恒星对其周围分子云环境反馈作用的相关研究
  • 批准号:
    11303081
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