【摘要】：具有形狀記憶功能的高分子材料(SMPs,Shape memory ploymers)是一種新型智能材料,具有良好的形狀回復(fù)率和生物相容性,比如聚亞氨酯(Polyurethane,PU),可應(yīng)用于口腔正畸。但是其彈性模量比較低,形狀回復(fù)力比較小。為了提高PU材料在口腔正畸應(yīng)用中的可行性,以PU為基體,玻璃纖維為增強(qiáng)填料,本文開展的工作主要包括以下幾個(gè)方面:(1)基于文獻(xiàn)分析和初步實(shí)驗(yàn)選擇增強(qiáng)PU的填料并探究玻纖增強(qiáng)形狀記憶聚氨酯(GFRSMPU,Glass fiber reinforced shape memory PU)的制作工藝,并制備長(zhǎng)方體狀實(shí)驗(yàn)試樣。(2)為了評(píng)估GFRSMPU的力學(xué)性能是否符合口腔正畸的要求,通過靜態(tài)拉伸實(shí)驗(yàn)測(cè)試其彈性模量、差示掃描量熱儀(DSC,Differential scanning calorimeter)測(cè)試其玻璃化轉(zhuǎn)變溫度、三點(diǎn)彎曲實(shí)驗(yàn)測(cè)試其彎曲模量、應(yīng)力松弛實(shí)驗(yàn)測(cè)試其應(yīng)力釋放情況以及用掃描電鏡(SEM,Scanning electron microscope)觀察其微觀斷口形貌,并評(píng)價(jià)了GFRSMPU的形狀記憶性能和美觀性。結(jié)果發(fā)現(xiàn):溫度為36℃和玻纖質(zhì)量分?jǐn)?shù)為35%時(shí),與SMPU相比,GFRSMPU的彈性模量提高了約381%,其玻璃化轉(zhuǎn)變溫度為36.25℃,具有形狀記憶性能和美學(xué)功能,力學(xué)性能有較大改善,其應(yīng)用于口腔正畸的可能性明顯提高。(3)建立GFRSMPU弓絲正畸有限元模型,以上頜側(cè)切牙作為研究對(duì)象,通過仿真分析比較了正畸患者的側(cè)切牙存在唇舌向和牙根冠方向錯(cuò)位時(shí)SMPU弓絲與GFRSMPU弓絲提供的初始正畸力,結(jié)果表明,GFRSMPU弓絲提供的初始正畸力約是純SMPU弓絲提供的力值的2倍。研究表明,玻纖增強(qiáng)SMPU力學(xué)性能的效果較為明顯,玻纖的加入對(duì)GFRSMPU的玻璃化轉(zhuǎn)變溫度、形狀記憶性能和外觀形貌影響不大,玻纖質(zhì)量分?jǐn)?shù)為35%的GFRSMPU適合制備用于牙齒錯(cuò)牙合(牙與合為一個(gè)字,下同)情況的正畸弓絲。
[Abstract]:Polymer material with shape memory (SMPs,Shape memory ploymers) is a new smart material with good shape recovery rate and biocompatibility such as polyamides (Polyurethane,PU) which can be used in orthodontics. However, its elastic modulus is relatively low and the shape recovery force is relatively small. In order to improve the feasibility of PU in orthodontic application, PU was used as matrix and glass fiber as reinforcing filler. The work of this paper mainly includes the following aspects: (1) based on the literature analysis and preliminary experiments, we select the filler for enhancing PU and explore the fabrication process of glass fiber reinforced shape memory polyurethane (GFRSMPU,Glass fiber reinforced shape memory PU). In order to evaluate whether the mechanical properties of GFRSMPU meet the requirements of orthodontics, the modulus of elasticity was measured by static tensile test, and the glass transition temperature was measured by differential scanning calorimeter (DSC,Differential scanning calorimeter). The flexural modulus was measured by three-point bending test, the stress release was measured by stress relaxation test, the morphology of microfracture was observed by scanning electron microscope (SEM,Scanning electron microscope), and the shape memory properties and aesthetics of GFRSMPU were evaluated. The results show that when the temperature is 36 鈩，

本文編號(hào)：2221658