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大四寫論文金蟲 (正式寫手)
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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
金蟲 (著名寫手)
- 翻譯EPI: 248
- 應(yīng)助: 41 (小學(xué)生)
- 金幣: 25886.4
- 紅花: 25
- 帖子: 2100
- 在線: 567.1小時(shí)
- 蟲號(hào): 72410
- 注冊(cè): 2005-06-04
- 專業(yè): 合成藥物化學(xué)
【答案】應(yīng)助回帖
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大四寫論文: 金幣+50, 翻譯EPI+1, ★★★很有幫助 2015-04-06 13:43:50
大四寫論文: 金幣+50, 翻譯EPI+1, ★★★很有幫助 2015-04-06 13:43:50
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摘要 一種離子液體(IL) ( 1,3-二丙基咪唑鎓鹽溴化物）和亞磷酸三苯酯共同用于借助于微波加速反應(yīng)系統(tǒng)通過(guò)磷�；埘０坊磻�(yīng)合成高有機(jī)可溶性和手性的帶有L-苯基丙氨酸和蒽單元的聚酰胺。與常規(guī)溶劑相比,該方法具有較高的特性粘度和較短的反應(yīng)時(shí)間,這表明IL和微波照射的配合是聚酰胺合成的一種有效、快速、簡(jiǎn)單的制備方法。這種聚合物的收率和熱穩(wěn)定性用兩種方法進(jìn)行比較。 所有聚合物產(chǎn)物都是非晶形的，在諸如N-甲基-2 -吡咯烷酮和N,N -二甲基乙酰胺等許多有機(jī)溶劑中具有極優(yōu)的溶解性,。獲得的聚酰胺具有玻璃態(tài)轉(zhuǎn)化溫度為約183℃, 10%失重溫度超過(guò)340℃,在氮?dú)庵?00℃的熱解半焦產(chǎn)率大于42%。 關(guān)鍵字 綠色化學(xué) 離子液體 微波照射 聚酰胺 引言 作為一種替代熱源，微波照射用于有機(jī)化合物和聚合物的合成已經(jīng)引起極大關(guān)注[ 1-3]。 據(jù)發(fā)現(xiàn)在聚合物合成中微波活化引起反應(yīng)性以及選擇性的提高。此外,它還經(jīng)常導(dǎo)致反應(yīng)時(shí)間的大幅度減少并有效改善聚合物的收率和性質(zhì)[ 2, 3]。 由于它們的高度極性,室溫下離子液體( RTIL)有效地吸收微波能[ 4, 5]。。 當(dāng)它們被用作溶劑及/或催化劑時(shí)這種性質(zhì)會(huì)顯著地促進(jìn)在RTIL中的反應(yīng)速度。 |
2樓2015-04-06 09:29:09
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