Citation: Xin Qi, Li-li Wu, Shu-sheng Li, Xiang-zheng Kong. Synthesis of Porous and Siloxane-containing Polyurea through Precipitation Polymerization[J]. Acta Polymerica Sinica, ;2019, 50(7): 730-739. doi: 10.11777/j.issn1000-3304.2018.18271 shu

Synthesis of Porous and Siloxane-containing Polyurea through Precipitation Polymerization

1.
College of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022
2.
Shandong Institute for Product Quality Inspection, Jinan 250102

Corresponding author: Shu-sheng Li, chm_liss@ujn.edu.cn
Received Date: 18 December 2018
Revised Date: 21 December 2018
Available Online: 21 January 2019

Poly(urea-siloxane) (PUS) was prepared through the precipitation polymerization between α,ω-aminopropyl disiloxane (APDS) and toluene diisocyanate (TDI) in H₂O-acetone mixed solvent, which involved no extra addition of surfactants, initiators, or any other additives. Effects of monomer ratio (APDS/TDI, W/W), binary solvent composition ratio (H₂O/acetone, W/W), and reaction temperature on the polymerization process and PUS morphology were investigated. Results indicated that tuning the APDS/TDI ratio could readily change the PUS morphology from a porous irregular form into porous microspheres. Specifically, the former appeared at APDS/TDI weight ratio no more than 2/8, while the latter occurred when increasing the APDS/TDI ratio up to 3/7 or higher; APDS/TDI ratio at 4/6 could affard porous PUS microspheres with 1 µm in diameter and narrow polydispersity. On the other hand, H₂O/acetone weight ratio and polymerization temperature also affected the size and size distribution of PUS microspheres remarkably, and the the narrowest size distribution of 1.04 was realized at APDS/TDI ratio of 4/6, H₂O/acetone ratio of 3/7, and polymerization temperature equal to 30 °C. With APDS/TDI ratio varied from 0/10 to 4/6, the pore volume of PUS increased from about 1.79 cm³/g to 2.36 cm³/g, whereas the specific surface area decreased from about 163.00 m²/g to 106.18 m²/g. On the basis of polymerization process, the changes in PUS morphology and porous properties versus APDS/TDI ratio variation could be well interpreted through the mechanisms of polymer precipitation and pore formation. PUS chemical structure was revealed by FTIR and NMR, while thermal property characterization indicated an enhanced thermal stability with the incorporation of APDS units into polyurea system.
- Precipitation polymerization,
- Polyurea,
- Siloxane,
- Polymer microspheres,
- Porous structure
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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Synthesis of Porous and Siloxane-containing Polyurea through Precipitation Polymerization

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com