化學氣相沉積共聚合法製備多功能性聚對二甲苯鍍膜及其特性分析

Abstract

本研究使用各式各樣官能化的對二甲苯二聚體，利用化學氣相沉積共聚合系統來製備功能性聚對二甲苯鍍膜，而為了因應生物環境多種不同生物分子的鍵結，我們發展出多功能性聚對二甲苯鍍膜於生物界面改質上之應用，使之更符合生物環境並達到更複雜之生物領域應用。 在單功能性聚對二甲苯鍍膜上，我選擇了共聚(4-苯甲醯對二甲苯-對二甲苯)來進行光反應，此官能基特點在於生物分子不須有特定官能基便能透過光反應與CH-以及NH-產生鍵結，利用這個特性我製作了抗結垢表面並以蛋白質吸附試驗證實其成功，並製作抗菌表面且以生物膜培養來驗證其效果，最後利用FTIR來證實其生物鍵結的效果。同時，在單功能性聚對二甲苯鍍膜裡，我也選擇了共聚(4-乙烯基對二甲苯-對二甲苯)以及共聚(4-馬來醯亞胺基甲基對二甲苯-對二甲苯)來和帶有巰(thiol)官能基的生物分子進行反應，並進行MTT Assay細胞存活率分析測試來驗證鍵結效果且比較兩個反應之差異。而在多功能性聚對二甲苯鍍膜上，首先在雙功能性聚對二甲苯鍍膜，我們同時利用在表面上具有的兩種官能基進行“click”反應接上不同生物分子，並進行細胞培養實驗，證實可以在同一表面上鍵結上兩種不同生物分子。最後我從各式各樣官能化的對二甲苯二聚體中選擇了三種，利用實驗室的三向化學氣向沉積共聚合系統製備三功能性聚對二甲苯鍍膜，利用FTIR以及XPS來檢測其成功合成，且利用螢光顯微鏡去證實螢光分子在生物耦合技術下鍵結的效果，證實在上面的三種官能基可以各別進行生物耦合反應且不互相影響，再利用FTIR分析來證明鍵結成功。 最後我期許這些功能性聚對二甲苯鍍膜能更有效的利用在生物領域的應用上，像是生物感測器、診斷儀器、植入性儀器等之應用。

We used a straightforward process for the fabrication of a functional poly(p-xylylene) polymer coating via CVD copolymerization process from substituted [2,2]paracyclophanes. For the unique selective bioconjugtions, it can control the covalence of biomolecules and can apply in biology fields such as provide a more sophisticated mimicry of surface engineering for advanced biomaterials design. For the monofunctional poly(p-xylylene) polymer coating, We choosed a photodefinable polymer, poly(4-benzoyl-p-xylylene-co-p-xylylene), the photoactivated carbonyl groups of the polymer has the potential to enable light-induced cross-linking of molecules and can rapidly react via insertion into CH- or NH- bonds upon photo-illumination at 340 nm. Importantly, the process does not require any additional functional groups on the antifouling materials. Molecules including poly(ethylene glycol) (PEG; average Mn = 400), poly(ethylene glycol) methyl ether methacrylate (PEGMA), dextran, and ethanolamine are used in the study without further modification. The resulting antifouling properties are examined by conducting protein adsorption on surfaces. infrared reflection absorption spectroscopy (IRRAS) have confirmed the characteristics of the immobilizations of these fouling materials. Furthermore, we also used poly(4-benzoyl-p-xylylene-co-p-xylylene) to immobilize of antibacterial molecules, chlorhexidine(CHX), and the resulting are examined by biofilm experiment. In addition, we choosed two monofunctional poly(p-xylylene) polymers , poly(4-vinyl-p-xylylene-co-p-xylylene) and poly(4-N-maleimidomethyl-p-xylylene- co-p-xylylene), which both can react with thiol functional group. We examined and compared these thiol reactions by MTT Assay cell viability analysis. For the multifunctional poly(p-xylylene) polymer coating, We fabricate the bi-functional poly(p-xylylene) polymer coating, poly[(4-N-maleimidomethyl-p- xylylene)-co-(4-methyl-propiolate-p-xylylene)-co-(p-xylylene)], which is compatible with the simultaneous presentation of multiple biomolecules, and we examined these bioorthogonal reactions by cell culture experiment. In this communication, we extended the concept of chemical vapor deposition copolymerization to three distinct feeding sources of starting materials, thereby establishing a versatile and simple avenue toward tri-functional coatings, poly[(4-ethynyl-p-xylylene)-co-(4-N-maleimidomethyl- p-xylylene)-co-(trifluoroacetyl-p-xylylene)-co-(p-xylylene)]. FT-IR spectroscopy and X-ray photoelectron spectroscopy (XPS) are used to characterize the chemical structure and composition of this novel coating. Alexa Fluor-555 azide, fluorescein (FITC)-labeled cysteine, and Alexa Fluor-350 hydrazide were selected as model reporter molecules for the according conjugation reactions. The reported CVD copolymerization technology to prepare multifunctional coatings are not limited to the functionalities reported and are expected to extend to the established library of functional groups including alcohols, benzoyl, ketones, esters, alkenes, and aldehydes, and we foresee the potential uses in microfluidics, cell culture study, diagnostic devices, and implant devices.