New Products and Processes by Cationic Polymerization

阳离子聚合新产品和新工艺

• 批准号: 9423202
• 负责人: Joseph Kennedy
• 金额: $ 65万
• 依托单位: University of Akron
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-03-15 至 2001-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9423202&HistoricalAwards=false
• 关键词: New; Products; Processes; Cationic; Polymerization

9423202 Kennedy The overall objective of this project is to understand and consequently to control the mechanism of cationic olefin polymerizations, and thus to develop useful novel advanced materials and processes of readily available monomers and equipment, respectively; the elucidation of structure/property relationships of the materials is an integral part of the project. This overall objective embraces four major specific objectives: 1) To explore the fundamentals and to expand the scope of living carbocationic polymerizations. Studies will mainly focus on the elucidation of the active living species, expansion to branched olefins (3-methyl-1-butene, 4-methyl-1-pentene, etc.) and conjugated dienes (butadiene, isoprene, etc.), and dollowing up the recent discovery that mixed Friedel-Crafts coinitiators yield living polymerization at temperatures higher than ambient. 2) To synthesize novel multi-arm star polymers. Seed research has shown that multi-arm radial star polyisobutylenes can be made by living cationic polymerization. This lead will be pursued to include the preparation of polymers with various molecular weights and a study of viscosity characteristics. 3) To prepare novel statistical copolymers of aliphatic/aromatic olefins, alkenes/conjugated dienes with controlled molecular weights and microcompositions. The stated objective could be reached by a new technique the so-called Continuous Controlled Copolymer Composition method. This lead will be pursued for the preparation of new designed copolymers. 4) To prepare new amphiphilic networks. Specifically, efforts will be made to prepare membranes with controlled permeability characteristics and new networks that respond to environmental stimuli (nature of solvent, pH). %%% This research is significant for the generation of basic knowledge needed for the preparation of new advanced materials with desirable combinations of properties, and for new multipurpose polymerization processes. A mong possible applications are motor-oil additives, thermoplastic elastomers, and biomaterials. ***

9423202 Kennedy该项目的总体目标是了解并因此控制阳离子烯烃聚合的机理，从而分别开发有用的新颖先进材料和容易获得的单体和设备的工艺;材料的结构/性能关系的阐明是该项目的组成部分。 这个总体目标包括四个主要的具体目标：1）探索基本原理并扩大活性碳阳离子聚合的范围。 研究将主要集中在活性物种的阐明，扩展到支链烯烃（3-甲基-1-丁烯，4-甲基-1-戊烯等）。和共轭二烯（丁二烯、异戊二烯等），以及最近发现的混合Friedel-Crafts共引发剂在高于环境温度下产生活性聚合。 2)合成新型多臂星星聚合物。 种子研究表明，多臂星形星星聚异丁烯可以通过活性阳离子聚合制备。 这一领导将追求包括各种分子量的聚合物的制备和粘度特性的研究。 3)制备具有可控分子量和微观组成的脂肪族/芳香族烯烃、烯烃/共轭二烯的新型统计共聚物。 所述目的可以通过所谓的连续控制共聚物组成方法的新技术来实现。这一领先优势将被用于制备新设计的共聚物。 4)制备新型两亲性网络。 具体而言，将努力制备具有受控渗透性特征和响应环境刺激（溶剂性质，pH）的新网络的膜。 这项研究对于制备具有理想性能组合的新型先进材料和新型多用途聚合工艺所需的基础知识的产生具有重要意义。 一个可能的应用是机油添加剂，热塑性弹性体和生物材料。 ***