当前位置: X-MOL 学术Polym. Degrad. Stabil. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Fast pyrolysis of silicones at low temperatures catalyzed by anatase titanium dioxide
Polymer Degradation and Stability ( IF 5.9 ) Pub Date : 2020-10-07 , DOI: 10.1016/j.polymdegradstab.2020.109387
Zi-Ming Qin , Pu-Cheng Wang , Rui Yang , Hong-Bing Chen

Silicones are widely used in medical and engineering field for their remarkable properties. The resulting waste is an increasing economic and environmental problem. Pyrolysis can be a feasible way to recycle silicone waste. Since its high thermal stability, looking for an efficient catalyst becomes necessary. In this work, anatase titanium dioxide was found to be very efficient in catalyzing the pyrolysis of silicones even at extremely low temperatures. The pyrolysis rate, pyrolysis products, the catalytic mechanism of silicones and the reusability of catalyst were investigated in detail via thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), wide-angle X-ray diffractometer (wide angle XRD), thermogravimetric analysis-Fourier transform infrared spectroscopy (TG-FTIR), and pyrolysis-gas chromatography/mass spectroscopy (Py-GC/MS). During pyrolysis, polysiloxane chain undergoes catalyzed unzipping depolymerization. The catalytic mechanism is believed to be the nucleophilic attack of silicon in the main chain by the hydroxyl group on anatase titanium dioxide. This is the first report on pyrolysis of silicones catalyzed by anatase titanium dioxide. The blending of anatase titanium dioxide with polysiloxane may become a promising technology for inexpensive, high efficient and sustainable feature in feedstock recycling of silicones. In addition, this new discovery also offers guidance that fillers with such high active hydroxyl groups should be avoided in polysixoane composites.



中文翻译:

锐钛矿型二氧化钛催化的硅酮在低温下快速热解

有机硅因其卓越的性能而广泛用于医疗和工程领域。产生的废物是日益严重的经济和环境问题。热解可能是回收有机硅废物的可行方法。由于其高的热稳定性,寻找有效的催化剂变得必要。在这项工作中,发现即使在极低的温度下,锐钛矿型二氧化钛对催化硅酮的热解也非常有效。通过热重分析(TGA),X射线光电子能谱(XPS),广角X射线衍射仪(广角XRD)详细研究了热解速率,热解产物,有机硅的催化机理和催化剂的可重用性。热重分析-傅立叶变换红外光谱(TG-FTIR)热解气相色谱/质谱(Py-GC / MS)。在热解期间,聚硅氧烷链经历催化的解链解聚。认为催化机理是主链中的硅被锐钛矿型二氧化钛上的羟基亲核攻击。这是关于锐钛矿型二氧化钛催化有机硅热解的首次报道。锐钛矿型二氧化钛与聚硅氧烷的共混可能成为有机硅原料回收中廉价,高效和可持续特性的有前途的技术。此外,这一新发现还提供了指导,即在聚六氢呋喃复合材料中应避免使用具有如此高活性羟基的填料。认为催化机理是主链中的硅被锐钛矿型二氧化钛上的羟基亲核攻击。这是关于锐钛矿型二氧化钛催化有机硅热解的首次报道。锐钛矿型二氧化钛与聚硅氧烷的共混可能成为有机硅原料回收中廉价,高效和可持续特性的有前途的技术。此外,这一新发现还提供了指导,即在聚六氢呋喃复合材料中应避免使用具有如此高活性羟基的填料。认为催化机理是主链中的硅被锐钛矿型二氧化钛上的羟基亲核攻击。这是关于锐钛矿型二氧化钛催化有机硅热解的首次报道。锐钛矿型二氧化钛与聚硅氧烷的共混可能成为有机硅原料回收中廉价,高效和可持续特性的有前途的技术。此外,这一新发现还提供了指导,即在聚六氢呋喃复合材料中应避免使用具有如此高活性羟基的填料。锐钛矿型二氧化钛与聚硅氧烷的共混可能成为有机硅原料回收中廉价,高效和可持续特性的有前途的技术。此外,这一新发现还提供了指导,即在聚六氢呋喃复合材料中应避免使用具有如此高活性羟基的填料。锐钛矿型二氧化钛与聚硅氧烷的共混可能成为有机硅原料回收中廉价,高效和可持续特性的有前途的技术。此外,这一新发现还提供了指导,即在聚六氢呋喃复合材料中应避免使用具有如此高活性羟基的填料。

更新日期:2020-10-15
down
wechat
bug