Compatibilization of Polymer Blends

聚合物共混物的增容

• 批准号: 9527940
• 负责人: Chris Macosko
• 金额: $ 36.01万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-05-15 至 1999-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9527940&HistoricalAwards=false
• 关键词: Compatibilization; Polymer; Blends

Macosko - Abstract - 9527940 Immiscible polymer-polymer blends are a growing part of the polymer industry. They can offer synergistic properties, the best features of both components. They also provide a means for the recycling of mixed polymer waste. Because the component polymers are immiscible, their blends must by stabilized against coalescence. To obtain the desired properties, the minor component must by well dispersed and its size and shape controlled, typically at the submicron scale. To achieve this dispersion level, blends are usually prepared in a twin screw extruder and block or graft copolymers are added to compatibilize the blend, i.e. to aid in dispersion and prevent coalescence. These copolymers are expected to reside in the interface between the two components also aiding mechanical adhesion. There are two ways to add copolymers to a blend: (1) Synthesize the block copolymers in a separate step and then add it with the other components during blending; and (2) Create the block or graft copolymer in situ, ruing the blending process by coupling reactions across the interface between the components. In this project, several strategies for making pre-made copolymers more effective are explored. The objectives of the research program are: 1. Develop a model for morphology generation during polymer melt blending that accounts for interfacial stabilization via reactive coupling. 2. Establish the competitive advantage to reactive blending versus addition of pre-made block copolymer. 3. Apply results of 1 and 2 to isotactic polypropylene. 4. Evaluate the effects of optimized two-phase morphology on mechanical properties. 5. Establish viable means of producing functional polymers in usable quantities. 6. Quantify the role of interfacial thickness and reaction kinetics on the efficiency of reactive blending.

Macosko -摘要- 9527940 不混溶的聚合物-聚合物共混物是聚合物工业中不断增长的部分。 它们可以提供协同特性，这是两种成分的最佳特性。 它们还为混合聚合物废物的回收提供了一种手段。 因为组分聚合物是不混溶的，所以它们的共混物必须稳定以防止聚结。 为了获得所需的性能，次要组分必须充分分散，并且其尺寸和形状通常在亚微米级上受到控制。 为了达到这种分散水平，通常在双螺杆挤出机中制备共混物，并加入嵌段或接枝共聚物以使共混物相容，即帮助分散并防止聚结。 预期这些共聚物存在于两个组分之间的界面中，也有助于机械粘合。 有两种方法将共聚物添加到共混物中：（1）在单独的步骤中合成嵌段共聚物，然后在共混期间将其与其他组分一起添加;和（2）原位产生嵌段或接枝共聚物，通过跨越组分之间的界面的偶联反应来进行共混过程。 在这个项目中，探索了几种使预制共聚物更有效的策略。 本研究的目的是：1。开发聚合物熔融共混过程中的形态生成模型，该模型通过反应偶联来解释界面稳定性。 2.建立反应性共混相对于添加预制嵌段共聚物的竞争优势。 3.将1和2的结果应用于全同立构聚丙烯。 4.评估优化的两相形态对机械性能的影响。 5.建立生产可用数量的功能聚合物的可行方法。 6.量化界面厚度和反应动力学对反应性共混效率的作用。