本文選題：聚硅氧烷　切入點：聚硅氧烷-聚己內(nèi)酯　出處：《長春工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：聚乳酸(PLA)是一種環(huán)保型脂肪族聚酯,由于其可再生性,生物可降解性和溫室氣體中性,已成為傳統(tǒng)石油基聚合材料的替代品。PLA是類似于聚苯乙烯和聚丙烯的高強度和高模量聚合物,但由于聚乳酸分子鏈剛性大,其固有脆性和柔韌性低限制它的應(yīng)用范圍。因此,怎樣增韌改性PLA成為其應(yīng)用研究的重點。本論文首先制備了端羥基聚甲基苯基硅氧烷(PMPS),然后通過共聚的方法合成聚硅氧烷-聚己內(nèi)酯嵌段共聚物(PCL-PMPS-PCL),討論其相關(guān)性能;將其作為增韌劑與聚乳酸的共混涂膜,考察聚硅氧烷-聚己內(nèi)酯嵌段共聚物對聚乳酸相關(guān)性能的影響。具體工作內(nèi)容如下:1.通過水解縮合的方法制備端羥基聚甲基苯基硅氧烷(PMPS)。FTIR和~1H NMR證明端羥基聚甲基苯基硅氧烷已成功合成。得出最佳工藝條件為:反應(yīng)溫度60℃、反應(yīng)時間為1.5h和催化劑用量為物料總質(zhì)量的1/200,利用凝膠滲透色譜(GPC)確定最優(yōu)條件下所得產(chǎn)物的分子量分布為1.25,分子量為2387。2.通過己內(nèi)酯(CL)開環(huán)聚合得到分子量為6387、10387、14387的聚硅氧烷-聚己內(nèi)酯嵌段共聚物。FTIR和~1H NMR證明聚硅氧烷-聚己內(nèi)酯嵌段共聚物已成功合成。GPC測試表明PCL-PMPS-PCL分子量分布窄。通過對其進行了X射線多晶衍射(XRD)、差示掃描量熱(DSC)和溶解性測試,研究其熱學(xué)性能、晶體結(jié)構(gòu)及與聚乳酸(PLLA)共溶的溶解性,結(jié)果表明PMPS鏈段對PCL的晶體結(jié)構(gòu)沒有影響,PCL-PMPS-PCL與聚乳酸PLLA可以共溶為一體,說明PCL-PMPS-PCL可以將PMPS鏈段引入PLLA中。3.通過共混涂膜的方法制備了PLLA與PCL-PMPS-PCL的共混薄膜。傅立葉紅外光譜(FTIR)測試表明薄膜中的PCL-PMPS-PCL與PLLA只是簡單的物理共混,沒有發(fā)生任何化學(xué)變化。通過DSC、拉伸性能測試儀的測試,研究PLLA與PCL-PMPS-PCL的共混比對薄膜熱學(xué)性能、力學(xué)性能和透明性的影響,結(jié)果表明PLLA與PCL-PMPS-PCL的共混比對薄膜熱性能有影響,PCL-PMPS-PCL改善了PLLA的力學(xué)性能,且PCL-PMPS-PCL與PLLA的共混比為15wt%,薄膜的總體性能最好。通過透明性測試,添加PCL-PMPS-PCL的薄膜透明性依然很好。
[Abstract]:Polylactic acid (PLA) is an environmentally friendly aliphatic polyester, due to its reproducibility, biodegradability and greenhouse gas neutrality. PLA is a high strength and high modulus polymer similar to polystyrene and polypropylene, but its inherent brittleness and flexibility limit its application scope because of its high rigidity of molecular chain of polylactic acid. How to toughen and modify PLA has become the focus of its application. In this paper, we first prepared hydroxyl terminated polymethylphenyl siloxane (PMP), then synthesized polysiloxane-polycaprolactone block copolymer (PCL-PMPS-PCLL) by copolymerization, and discussed its related properties. It was used as the blend film of polylactic acid and toughening agent. The effect of polysiloxane-polycaprolactone block copolymer on the properties of polylactic acid was investigated. The specific work is as follows: 1. Hydroxy terminated polymethylphenyl siloxane was prepared by hydrolysis condensation method. FTIR and 1H NMR proved that hydroxyl terminated polymethylsiloxane was obtained. The synthesis of phenyl siloxane has been carried out successfully. The optimum conditions are obtained as follows: reaction temperature 60 鈩，

本文編號：1645203