Adsorption and Adhesion on Semi-Crystalline Polymers

半结晶聚合物的吸附和粘附

• 批准号: EP/G032874/1
• 负责人: Richard Thompson
• 金额: $ 41.81万
• 依托单位: Durham University
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2009
• 资助国家: 英国
• 起止时间: 2009 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FG032874%2F1
• 关键词: Adsorption; Adhesion; Semi; Crystalline; Polymers

Rarely can the perfect combination of bulk properties (strength, transparancy etc) and surface properties (water repellency, stickyness, etc) be found in any single material. Methods to achieve the desired surface properties of an object are commonly referred to as surface modification. Although the surface modification concept is not new - the ancient Egyptians achieved this with glue and varnish using natural products - the need to optimise these methods for new materials and to make efficient use of limited existing material resources is ever more important.Many everyday polymers such as polyethylene (PE), polypropylene (PP) and PET require surface modification to fulfil new functions. Certain applications, notably in printing, electronics and packaging, require modification of the native surface properties of these polymers. Many coating techniques have been developed to overcome this limitation, but most require additional processing steps. Furthermore, there is always some concern that the coating is either wasteful of material (too thick), or may be too thin or fragile to perform its function properly.We propose an alternative route to achieve surface modification, whereby the host polymer is blended with a small amount of a additive polymer, that differs only in that one end of each additive polymer molecule has been chemically modified. Provided the chemically modified groups can be attracted to the blend surface, the adsorption of the additive polymer to the surface of the blend will modify its external surface properties. In some cases this attraction is spontaneous and very easily achieved, in others, it may be induced by careful control of the processing conditions. Previously we have shown that this technique can work extremely well for several non-crystalline polymers, however it has never been attempted for a semi-crystalline polymer such as polyethylene. The semi-crystalline nature of PE, PP, and PET is vital to their excellent bulk properties, but also makes these materials more difficult to analyse. However, since the surface properties of these materials are also notoriously difficult to modify by other methods, there is a real need to explore this possibility further. Recently we have shown that the ion beam analysis techniques used at Durham are perfectly well suited to examine semi-crystalline polymer blends, therefore we are well placed to carry out this project.We are especially interested in the relationship between the adsorption of surface modifying polymers within the blend to its surface, and mineral deposition or adsorption to the external surface of the blend. Clearly these processes should be related since adsorption within the polymer blend will provide a template for adsorption from external media. This is potentially extremely very important for biophysical properties of the polymer, such as bone biocompatibility, and we plan to carry out the first sytematic study of this relationship.

在任何单一材料中很少能找到整体特性（强度、透明度等）和表面特性（防水性、粘性等）的完美结合。实现物体所需表面特性的方法通常称为表面改性。尽管表面改性概念并不新鲜——古埃及人使用天然产品通过胶水和清漆实现了这一点——但优化这些新材料方法并有效利用有限的现有材料资源的需求变得越来越重要。许多日常聚合物，例如聚乙烯 (PE)、聚丙烯 (PP) 和 PET 需要进行表面改性才能实现新功能。某些应用，特别是印刷、电子和包装领域，需要改变这些聚合物的天然表面特性。已经开发了许多涂层技术来克服这一限制，但大多数都需要额外的处理步骤。此外，总是有人担心涂层要么浪费材料（太厚），要么太薄或太脆弱而无法正常发挥其功能。我们提出了一种实现表面改性的替代途径，即将主体聚合物与少量的添加剂聚合物，其不同之处仅在于每个添加剂聚合物分子的一端经过化学改性。如果化学改性基团可以被吸引到共混物表面，则添加剂聚合物对共混物表面的吸附将改变其外表面性质。在某些情况下，这种吸引力是自发的并且很容易实现，而在其他情况下，它可以通过仔细控制加工条件来诱导。之前我们已经证明，这种技术对于几种非结晶聚合物非常有效，但从未尝试过用于聚乙烯等半结晶聚合物。 PE、PP 和 PET 的半结晶性质对其优异的整体性能至关重要，但也使这些材料更难以分析。然而，由于这些材料的表面特性也很难通过其他方法进行改性，因此确实需要进一步探索这种可能性。最近，我们已经证明达勒姆使用的离子束分析技术非常适合检查半结晶聚合物共混物，因此我们完全有能力开展这个项目。我们对表面改性聚合物的吸附之间的关系特别感兴趣共混物内部的矿物沉积或吸附到共混物的外表面。显然，这些过程应该是相关的，因为聚合物共混物内的吸附将为外部介质的吸附提供模板。这对于聚合物的生物物理特性（例如骨生物相容性）可能极其重要，我们计划对这种关系进行首次系统研究。

项目成果

Synthesis and surface activity of high and low surface energy multi-end functional polybutadiene additives

• DOI: 10.1039/c2sm07361g
• 发表时间: 2012-02
• 期刊: Soft Matter
• 影响因子: 3.4
• 作者: S. M. Kimani;S. Hardman;L. R. Hutchings;N. Clarke;R. Thompson

Multihydroxyl End Functional Polyethylenes: Synthesis, Bulk and Interfacial Properties of Polymer Surfactants

• DOI: 10.1021/ma402158b
• 发表时间: 2014-03
• 期刊: Macromolecules
• 影响因子: 5.5
• 作者: S. M. Kimani;R. Thompson;L. R. Hutchings;N. Clarke;S. M. R. Billah;V. G. Sakai;S. Rogers

Surface modification of polyethylene with multi-end-functional polyethylene additives.

• DOI: 10.1021/la205158n
• 发表时间: 2012-03
• 期刊: Langmuir : the ACS journal of surfaces and colloids
• 作者: S. Hardman;L. R. Hutchings;N. Clarke;S. M. Kimani;Laura L. E. Mears;Emily F. Smith;J. Webster;R. Thompson