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NANOSTRUCTURED POLYURETHANEDISPERSIONS

机译：纳米结构聚氨酯​​分散体

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摘要

Due to their superior properties, ease of use, and "green" nature,rnwaterborne polyurethane dispersions (PUDs) are often materials ofrnchoice for a wide spectrum of applications. Common processes forrnmaking these dispersions do not offer easy ways of controlling particlernmorphology/architecture. This puts PUDs in a position inferior tornstructured acrylic emulsions. The latter are most readily produced by thernsequential or staged addition of monomers, which is widely used in thernengineering of structured acrylic and vinyl emulsion polymers. Due to thernfact that PU oligomers do not diffuse through the aqueous phase, thisrnroute is closed for PUDs. How can we overcome this fundamentalrnobstacle?rnIn this paper we describe a new method that enables thernpreparation of nanostructured PU particles having a wide variety ofrnmorphologies. The method is comprised of the preparation of twornprepolymers with different hydrophilicities, which are mixed togetherrnbefore the dispersion step. Surprisingly, the mixture "remembers" that itrnwas made of two different prepolymers and, as soon as the prepolymer isrndispersed in water, diffusion within the particles sets in. The origin of thisrnunexpected memory is examined in detail. The interplay of diffusion,rnphase separation and chain extension determines the morphologicalrnoutcome. Various previously inaccessible PU particle morphologiesrnincluding core-shell and "ice-cream cone" have been prepared. This novelrnpatent-pending technology opens up new horizons for PUD chemistry.
机译：由于其优异的性能，易用性和“绿色”性质，水性聚氨酯分散体（PUD）通常是广泛应用的选择材料。制备这些分散体的常用方法不能提供控制颗粒形态/结构的简便方法。这使PUD的位置劣于撕裂结构的丙烯酸乳液。后者最容易通过顺序或分阶段添加单体来生产，其广泛用于结构化丙烯酸和乙烯基乳液聚合物的工程设计中。由于PU低聚物不会扩散通过水相的事实，该途径对于PUD是封闭的。在本文中，我们描述了一种新方法，该方法能够制备具有多种形貌的纳米结构PU颗粒。该方法包括制备具有不同亲水性的两种预聚物，将其在分散步骤之前混合在一起。出乎意料的是，该混合物“记住”它是由两种不同的预聚物组成的，一旦将预聚物分散在水中，颗粒中的扩散就会开始。详细检查这种意外记忆的起源。扩散，相分离和链延伸的相互作用决定了形态学结果。已经制备了各种先前难以获得的PU颗粒形态，包括核-壳和“冰淇淋锥”。这项正在申请专利的新技术为PUD化学开辟了新的视野。

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  • 会议地点 Manchester(GB)
  • 作者

    Alex Lubnin; Dennis Malaba; Vic Stanislawszyk; rnGary Calhoun;

  • 作者单位

    Noveon Incrn9911 Brecksville RoadrnClevelandrnOhio 44141-3247rnUSA Tel +1 216 447 5507rnFax +1 216 447 5721rne-mail Alex.Lubnin@Noveon.com;

    Noveon Incrn9911 Brecksville RoadrnClevelandrnOhio 44141-3247rnUSA;

    Noveon Incrn9911 Brecksville RoadrnClevelandrnOhio 44141-3247rnUSA;

    Noveon Incrn9911 Brecksville RoadrnClevelandrnOhio 44141-3247rnUSA;

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  • 正文语种 eng
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