本實驗利用低熔點聚丙烯於適當有機溶劑中呈現之黏彈特性，嘗試將其製備為聚烯烴黏膠(polyolefin adhesive)，並應用於鋁箔與聚丙烯膜之貼合研究。比較聚丙烯黏膠及使其分散之溶劑在基材上所表現的潤濕性質，並發現隨著基材粗糙度上升，改變黏膠在基材上的潤濕行為而使接觸面積增加，黏著強度便會提升。以流變儀、示差掃描熱分析儀檢測黏膠物性，發現由馬來酸酐接枝上低熔點聚丙烯配置而成之黏膠，其在固化過程中可呈現流動特性有利滲入基材結構，而固化後則展現可抵抗機械外力之彈體特徵，同時得到越高官能化比例之聚丙烯高分子具越低結晶度之趨勢。最後，利用Lap-joint方法測試各種馬來酸酐接枝比例之聚丙烯黏膠的黏著效果並探討其黏著機制。結果顯示接枝上0.5 %馬來酸酐的聚丙烯黏膠具有最佳的黏著強度6.5 MPa。藉由改變多種實驗參數，如接著處外力加壓、添加化學交聯劑與否、及固化時間等，以建立低熔點聚丙烯黏膠之貼合機制模型。其中，黏膠於基材界面間的作用力和擴散作用與機械結合機制有著密不可分的關係；聚丙烯黏彈體之機械性質則同時受到其化學交聯及物理結晶的程度調控。;This research is focused on the preparation and characterization of polypropylene (PP) based adhesives. The low melting PP was dissolved in organic solvents to prepare the polyolefin adhesive. The adhesive exhibited elastomer-like properties during its curing process and it was applied to adhere the aluminum foil and polypropylene film. The wettability behavior of PP viscose and organic solvents of PP dissolution was measured on these substrates. It was found that as the surface roughness of the substrates increased, the wetting behavior of the adhesive changed (i.e. contact angle decreased) and improved the adhesion performance. Rheometer and differential scanning calorimeter were used to detect the physicochemical properties of the viscose adhesive. The maleic anhydride grafted PP exhibited fluid characteristics during curing process that made the adhesive infiltrate into the substrate structure. After the curing process, the cured adhesive displayed its elastic property to resist the mechanical external force. Also, the PP polymer containing more anhydride functional groups demonstrated lower crystallinity. The adhesion performance of PP viscose with various ratio of maleic anhydride was evaluated by using the lap-joint tests. The adhesive with 0.5 % maleic anhydride grafted PP shows the best adhesive strength of about 6.53 MPa. The mechanical properties of the polyolefin elastomer are controlled by the chemical crosslinking and physical crystallization. To establish an adhesive mechanism model, the experiment was designed to change different parameters such as external pressure, chemical cross-linking agent and curing time, etc. In summary, the adhesion performance matters a lot to both mechanical property of adhesive and interface interactions of adhesive molecules and substrates. Moreover, the diffusion of viscose at the interface of the substrates is closely related to the mechanism of mechanical interlock.
