聚硅氧烷—聚己内酯制备及其增韧聚乳酸研究

发布时间：2018-03-21 19:22

  本文选题：聚硅氧烷　切入点：聚硅氧烷-聚己内酯　出处：《长春工业大学》2017年硕士论文　论文类型：学位论文

【摘要】：聚乳酸(PLA)是一种环保型脂肪族聚酯,由于其可再生性,生物可降解性和温室气体中性,已成为传统石油基聚合材料的替代品。PLA是类似于聚苯乙烯和聚丙烯的高强度和高模量聚合物,但由于聚乳酸分子链刚性大,其固有脆性和柔韧性低限制它的应用范围。因此,怎样增韧改性PLA成为其应用研究的重点。本论文首先制备了端羟基聚甲基苯基硅氧烷(PMPS),然后通过共聚的方法合成聚硅氧烷-聚己内酯嵌段共聚物(PCL-PMPS-PCL),讨论其相关性能;将其作为增韧剂与聚乳酸的共混涂膜,考察聚硅氧烷-聚己内酯嵌段共聚物对聚乳酸相关性能的影响。具体工作内容如下:1.通过水解缩合的方法制备端羟基聚甲基苯基硅氧烷(PMPS)。FTIR和~1H NMR证明端羟基聚甲基苯基硅氧烷已成功合成。得出最佳工艺条件为:反应温度60℃、反应时间为1.5h和催化剂用量为物料总质量的1/200,利用凝胶渗透色谱(GPC)确定最优条件下所得产物的分子量分布为1.25,分子量为2387。2.通过己内酯(CL)开环聚合得到分子量为6387、10387、14387的聚硅氧烷-聚己内酯嵌段共聚物。FTIR和~1H NMR证明聚硅氧烷-聚己内酯嵌段共聚物已成功合成。GPC测试表明PCL-PMPS-PCL分子量分布窄。通过对其进行了X射线多晶衍射(XRD)、差示扫描量热(DSC)和溶解性测试,研究其热学性能、晶体结构及与聚乳酸(PLLA)共溶的溶解性,结果表明PMPS链段对PCL的晶体结构没有影响,PCL-PMPS-PCL与聚乳酸PLLA可以共溶为一体,说明PCL-PMPS-PCL可以将PMPS链段引入PLLA中。3.通过共混涂膜的方法制备了PLLA与PCL-PMPS-PCL的共混薄膜。傅立叶红外光谱(FTIR)测试表明薄膜中的PCL-PMPS-PCL与PLLA只是简单的物理共混,没有发生任何化学变化。通过DSC、拉伸性能测试仪的测试,研究PLLA与PCL-PMPS-PCL的共混比对薄膜热学性能、力学性能和透明性的影响,结果表明PLLA与PCL-PMPS-PCL的共混比对薄膜热性能有影响,PCL-PMPS-PCL改善了PLLA的力学性能,且PCL-PMPS-PCL与PLLA的共混比为15wt%,薄膜的总体性能最好。通过透明性测试,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，

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