Morphology development of physical polymer mixtures in sintering based processing technologies

基于烧结的加工技术中物理聚合物混合物的形态发展

• 批准号: 523208-2018
• 负责人: Thompson, Michael
• 金额: $ 1.97万
• 依托单位: McMaster University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=681909
• 关键词: Morphology; development; physical; polymer; mixtures

Polymer sintering technologies are used to manufacture parts of dimensions ranging from metres to microns, with simple or complex structures, based on the melt coalescence of powders. Rotational molding is the more mature technology in this area where 3D printing by selective laser sintering is still emerging. Both methods form products that are often difficult or impossible by other polymer processing approaches. However, the absence of shear stresses in both has created limitations on the materials selected with these technologies, which has in turn kept them out of markets reliant on more advanced properties. North America has the largest concentration of rotational molding manufacturers globally and 3D printing methods are considered integral to Canada's high technology economy, making both strategically important to our manufacturing sector. It is beneficial to Canada that we advance their capabilities to complete in market sectors where more advanced properties are demanded. Broadening the properties to satisfy the needs of new applications, mixtures of polymers are often combined to form complex phase morphologies. Stable blend morphologies of two or more polymers are commonly produced in the presence of shear and elongational stresses. With an absence of shear stresses, the options for rotational molding and selective laser sintering (SLS) are only to use pre-compounded materials, which add considerable costs, or to consider a poorly understood alternative where physical mixtures of polymers are sintered to form a blend. This proposal will increase the industry's understanding of this less expensive alternative by sintering a physical mixture and will compare its findings to pre-compounded materials. The goal of the studies is to identify approaches whereby desirable blend morphologies arise by controlling composition, viscosity ratio, resin compatibility, crystallinity and particle packing density. The intent is to deliver a statistical model which the industrial sponsor and others may use to predict final properties as they are related to the morphology formed.

聚合物烧结技术基于粉末的熔融聚结，用于制造尺寸从米到微米、具有简单或复杂结构的零件。旋转成型是该领域较为成熟的技术，而通过选择性激光烧结进行的 3D 打印仍在兴起。 这两种方法形成的产品通常是其他聚合物加工方法难以或不可能的。然而，两者均不存在剪切应力，这对使用这些技术选择的材料造成了限制，这反过来又使它们无法依赖更先进性能的市场。 北美拥有全球最集中的滚塑制造商，3D 打印方法被认为是加拿大高科技经济不可或缺的一部分，这使得这两者对我们的制造业都具有重要的战略意义。 我们提高他们在需要更先进性能的市场领域的能力，这对加拿大是有利的。 为了扩大性能以满足新应用的需求，聚合物的混合物通常组合在一起形成复杂的相形态。 两种或多种聚合物的稳定共混形态通常是在存在剪切应力和拉伸应力的情况下产生的。 在不存在剪切应力的情况下，旋转成型和选择性激光烧结 (SLS) 的选择只能是使用预复合材料，这会增加相当大的成本，或者考虑一种人们知之甚少的替代方案，即烧结聚合物的物理混合物以形成混合。 该提案将通过烧结物理混合物来增加业界对这种更便宜的替代品的理解，并将其发现与预复合材料进行比较。研究的目的是确定通过控制成分、粘度比、树脂相容性、结晶度和颗粒堆积密度来产生所需共混物形态的方法。目的是提供一个统计模型，工业赞助商和其他人可以使用该模型来预测与形成的形态相关的最终特性。