Citation: Ting Sai, Shi-ya Ran, Zheng-hong Guo, Zheng-ping Fang. Fabrication of a La-based Metal Organic Framework and Its Effect on Fire Safety and Thermal Stability of Polycarbonate[J]. Acta Polymerica Sinica, ;2019, 50(12): 1338-1347. doi: 10.11777/j.issn1000-3304.2019.19108 shu

Fabrication of a La-based Metal Organic Framework and Its Effect on Fire Safety and Thermal Stability of Polycarbonate

1.
Ministy of Education Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027
2.
Laboratory of Polymer Materials and Engineering, Ningbo Institute of Technology, Zhejiang University, Ningbo 315100

Corresponding author: Shi-ya Ran, ranshiya@nit.zju.edu.cn
Received Date: 28 May 2019
Revised Date: 9 July 2019

A La-based metal organic framework (La-BDC) was synthesized by a solvothermal method and then compounded with polycarbonate (PC) to prepare PC/La-BDC composites. The experimental (TGA, cone, vertical burning test, etc.) results showed that La-BDC improved the fire safty and thermal stability of PC. Compared with the neat PC, 2 wt% La-BDC could increase the two maximum decomposition temperatures (T_max1 and T_amx2) of PC in air atmosphere by 43 and 40 °C, respectively; 4 wt% La-BDC could reduce the values of peak heat release rate (PHRR) and average specific extinction area (ASEA) by 50% and 38%, respectively. PC/LaD-4 composites reached UL-94 V-0 rating in vertical burning test. On the one hand, naked La metal ion cluster, as a coordinated center, afforded La-BDC activity in catalytic oxidation, isomerization reactions etc., imparting it the ability to catalyze char formation (cross-linking) in the combustion and degradation process of PC matrix. From SEM images and Raman spectrum, the denser and highly graphitized char layers were obtained. The char layers reduced the contact between the matrix and oxygen, effectively suppressing the spillover of heat, pyrolysis products and toxic fumes. On the other hand, the rod-like crystal structure of La-BDC and the mesopores contained in its own framework structure made it play a role in adsorption and retarded of smoke generation.
- Metal organic framework,
- Rare earth metal,
- Polycarbonate,
- Fire safty,
- Thermal stability
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