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Abstract An ionic liquid (IL) (1,3-dipropylimidazolium bromide) in combination with triphenyl phosphite was employed for the synthesis of highly organosoluble and chiral polyamides bearing L-phenylalanine and anthracenic units via the phosphorylation polyamidation reaction with the assistance of a microwave-accelerated reaction system. Compared with conventional solvents, this approach exhibited higher inherent viscosities and shorter reaction time, which indicated coupling of IL and microwave irradiation was an efficient, rapid, and simple preparation technique for the synthesis of polyamides. The yields and thermal stability of the polymers were comparative under two methods. All of the resulting polymers were amorphous with excellent solubility in many organic solvents, such as N-methyl-2-pyrrolidinone and N,N-dimethylacetamide. The obtained polyamides had glass transition temperatures of about 183 C, 10% weight-loss temperatures in excess of 340 C, and char yields at 800 C in nitrogen higher than 42%. Keywords Green chemistry Ionic liquid Microwave irradiation Polyamides Introduction The application of microwave irradiation as an alternative heat source has attracted a great deal of attention for the synthesis of organic compounds and polymers [1–3]. It has been revealed that microwave activation in the polymer synthesis causes enhancements in the reactivity as well as selectivity. Furthermore, it often leads to substantial reduction of the reaction time, and a net improvement of the yields and of the properties of the polymers [2, 3]. Owing to their high polarity, room temperature ionic liquids (RTILs) efficiently absorb microwave energy [4, 5]. This property should significantly accelerate reaction rates in RTILs when they are utilized as solvents and/or catalysts. |
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jiangguofeng
金虫 (著名写手)
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大四写论文: 金币+50, 翻译EPI+1, ★★★很有帮助 2015-04-06 13:43:50
大四写论文: 金币+50, 翻译EPI+1, ★★★很有帮助 2015-04-06 13:43:50
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摘要 一种离子液体(IL) ( 1,3-二丙基咪唑鎓盐溴化物）和亚磷酸三苯酯共同用于借助于微波加速反应系统通过磷酰化聚酰胺化反应合成高有机可溶性和手性的带有L-苯基丙氨酸和蒽单元的聚酰胺。与常规溶剂相比,该方法具有较高的特性粘度和较短的反应时间,这表明IL和微波照射的配合是聚酰胺合成的一种有效、快速、简单的制备方法。这种聚合物的收率和热稳定性用两种方法进行比较。 所有聚合物产物都是非晶形的，在诸如N-甲基-2 -吡咯烷酮和N,N -二甲基乙酰胺等许多有机溶剂中具有极优的溶解性,。获得的聚酰胺具有玻璃态转化温度为约183℃, 10%失重温度超过340℃,在氮气中800℃的热解半焦产率大于42%。 关键字 绿色化学 离子液体 微波照射 聚酰胺 引言 作为一种替代热源，微波照射用于有机化合物和聚合物的合成已经引起极大关注[ 1-3]。 据发现在聚合物合成中微波活化引起反应性以及选择性的提高。此外,它还经常导致反应时间的大幅度减少并有效改善聚合物的收率和性质[ 2, 3]。 由于它们的高度极性,室温下离子液体( RTIL)有效地吸收微波能[ 4, 5]。。 当它们被用作溶剂及/或催化剂时这种性质会显著地促进在RTIL中的反应速度。 |
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