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首页> 外文期刊>Journal of Applied Polymer Science >Improved method for the isolation and purification of water-soluble polyphosphazenes
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Improved method for the isolation and purification of water-soluble polyphosphazenes

机译：水溶性聚磷腈的分离纯化方法

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摘要

We report in this article an improved procedure to isolate and purify representative water-soluble polyphosphazenes that dramatically reduces the time and equipment involved, while maintaining or exceeding the yields and purity reported in the literature for these polymers obtained using dialysis methods. This technique takes advantage of the phase transition behavior exhibited by some hydrophilic polymers, namely that associated with the lower critical solubility temperature (LCST). The polymers used in this study were poly[bis-(2-(2-methoxyethoxy)ethoxy)phosphazene], MEEP (1), and two new water-soluble polymers. These polymers are similar to MEEP, yet they contain a small percentage of a crosslinkable pendant group; either 8-hydroxy-ethyl allyl ether (2), or o-allyl phenol (3). The observed behavior was quite different for these two polymers than that found for MEEP, and is a direct consequence of the pendant group substitution patterns. Although the homopolymer MEEP yielded a single sharp LCST point, the two heteropolymers exhibited this phase transition over a broader temperature range. Further, fractionation of polymer 3, based on pendant group speciation, was possible due to the more hydrophobic nature of the phenol. (C) 2000 John Wiley & Sons, Inc. [References: 13]
机译：我们在本文中报告了一种分离和纯化代表性水溶性聚磷腈的改进方法，该方法可显着减少所需的时间和设备，同时保持或超过文献中使用透析方法获得的这些聚合物的收率和纯度。该技术利用了一些亲水性聚合物表现出的相变行为，即与较低的临界溶解温度（LCST）相关的相变行为。在这项研究中使用的聚合物是聚[双-（2-（2-（2-甲氧基乙氧基）乙氧基）磷腈]，MEEP（1）和两种新的水溶性聚合物。这些聚合物与MEEP相似，但它们包含一小部分可交联的侧基。 8-羟乙基烯丙基醚（2）或邻烯丙基苯酚（3）。这两种聚合物的观察到的行为与MEEP观察到的行为有很大不同，这是侧基取代模式的直接结果。尽管均聚物MEEP产生了一个单一的尖峰LCST点，但两种杂聚物在更宽的温度范围内均表现出这种相变。此外，由于苯酚的疏水性更强，基于侧基基团形成的聚合物3的分馏是可能的。 （C）2000 John Wiley＆Sons，Inc. [参考：13]

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