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.

在任何一种材料中，很少能找到体积特性（强度、透明度等）和表面特性（防水性、粘性等）的完美结合。实现物体的期望表面性质的方法通常被称为表面改性。虽然表面改性的概念并不新鲜--古埃及人使用天然产物通过胶水和清漆实现了这一点--但优化这些方法以适应新材料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，如聚乙烯（PE）、聚丙烯（PP）和PET，都需要进行表面改性以实现新的功能。某些应用，特别是在印刷、电子和包装中，需要对这些聚合物的天然表面性质进行改性。已经开发了许多涂层技术来克服这种限制，但大多数需要额外的处理步骤。此外，总是有一些担心，涂层是浪费的材料（太厚），或可能太薄或脆弱，以执行其功能property.We提出了一种替代路线，以实现表面改性，其中主体聚合物与少量的添加剂聚合物共混，不同的只是在每个添加剂聚合物分子的一端已被化学改性。如果化学改性基团可以被吸引到共混物表面，则添加剂聚合物吸附到共混物表面将改变其外表面性质。在某些情况下，这种吸引是自发的，很容易实现，在其他情况下，它可以通过仔细控制加工条件来诱导。以前我们已经表明，这种技术可以非常好地工作的几个非结晶聚合物，但它从来没有尝试过半结晶聚合物，如聚乙烯。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性质也非常难以通过其他方法进行改性，因此有真实的需要进一步探索这种可能性。最近，我们已经表明，在达勒姆使用的离子束分析技术是非常适合于检查半结晶聚合物共混物，因此，我们很好地进行这个project.We是特别感兴趣的表面改性聚合物的共混物内的吸附到其表面，和矿物沉积或吸附到共混物的外表面之间的关系。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提供从外部介质吸附的模板。这对于聚合物的生物物理性质（如骨生物相容性）可能非常重要，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

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

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