本文選題：尼龍12　切入點：分子量　出處：《鄭州大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：尼龍12以其優(yōu)異的物理機械性能,已經(jīng)在汽車工業(yè)、化學(xué)工業(yè)、電子電器工業(yè)、醫(yī)療器械等諸多領(lǐng)域獲得廣泛地應(yīng)用。隨著科技的不斷進步和3D打印的快速發(fā)展,尼龍12重要性變得更加突出。因此,研究分子量對尼龍12性能的影響具有鮮明地時代特色,本課題以此為出發(fā)點,開展了相關(guān)工作。取得如下成果:(1)以十二內(nèi)酰胺為原料,采用水解開環(huán)聚合的方法,研究了聚合工藝和不同分子量尼龍12的合成。結(jié)果表明:反應(yīng)溫度260~270℃,反應(yīng)時間6小時,催化劑為次亞磷酸鈉,合成出六種不同分子量的尼龍12。(2)用DSC研究了不同分子量尼龍12的熔融結(jié)晶行為。結(jié)果表明:隨著分子量的增大,尼龍12的結(jié)晶度逐漸降低,結(jié)晶溫度逐漸升高,說明分子量的增大,有利于晶核的形成,而不利于晶體的生長。(3)用TG研究了不同分子量尼龍12的熱降解性。結(jié)果表明:隨著分子量的增大,尼龍12的熱降解溫度逐漸升高,熱降解過程通過一步反應(yīng)完成,符合無規(guī)斷裂的機理。(4)研究了不同分子量尼龍12對加工工藝和力學(xué)性能的影響,以及吸水和低溫對物理機械性能的影響。結(jié)果表明:隨著尼龍12分子量的增大,加工過程所需的溫度和壓力逐漸增大;吸水后的尼龍12,拉伸強度和彎曲強度降低,斷裂伸長率和缺口沖擊強度提高;低溫條件下,拉伸強度有大幅度提高。(5)用DMA研究了尼龍12的松弛轉(zhuǎn)變。結(jié)果表明:尼龍12存在兩種不同的松弛轉(zhuǎn)變,分別是50℃附近的α轉(zhuǎn)變峰和-46℃附近的β轉(zhuǎn)變峰。
[Abstract]:With its excellent physical and mechanical properties, nylon 12 has been widely used in automobile industry, chemical industry, electronic and electrical industry, medical device, etc. With the development of science and technology and the rapid development of 3D printing, Nylon 12 has been widely used in many fields, such as automobile industry, chemical industry, electronics industry, medical device and so on. The importance of nylon 12 has become more prominent. Therefore, the study of the influence of molecular weight on the properties of nylon 12 has distinctive characteristics of the times. The polymerization process and the synthesis of nylon 12 with different molecular weight were studied by hydrolytic ring-opening polymerization. The results showed that the reaction temperature was 260 鈩，

本文編號：1574105