Improvement of thermoplastic polyurethane's flame retardancy and thermal conductivity by leaf‐shaped cobalt‐zeolitic imidazolate framework–modified graphene and intumescent flame retardant. (7th September 2020)

• Record Type: Journal Article
• Authors: Xu, Wenzong; Cheng, Chuanming; Qin, Zhongqiong; Zhong, Di; Cheng, Zihao; Zhang, Qianqian
• Is Part Of: Polymers for advanced technologies. Volume 32:Number 1(2021)
• Page Start: 228
• Page End: 240
• Publication Date: 2020-09-07
• Subjects: flame retardant -- graphene -- leaf‐shaped cobalt‐zeolitic imidazolate framework -- thermal conductivity -- thermoplastic polyurethane; Polymers -- Periodicals; 668.9
• DOI: 10.1002/pat.5078
• Languages: English
• ISSNs: 1042-7147

Abstract

Abstract : In this work, a new type of leaf‐shaped cobalt‐zeolitic imidazolate framework–modified graphene (Co‐ZIF‐L@RGO) hybrid was successfully prepared and blended with an intumescent flame retardant (IFR). It was added into thermoplastic polyurethane (TPU) to study the effect of its combination with IFR on the thermal conductivity and flame retardant performance of TPU. The morphology and structure of the Co‐ZIF‐L@RGO hybrid were characterized by scanning electron microscope (SEM), Fourier transform infrared and X‐ray diffraction (XRD). The results showed that Co‐ZIF‐L were uniformly loaded on the surface of graphene. Furthermore, compared with pure TPU, the limiting oxygen index values of the composite material with 3 wt% Co‐ZIF‐L and 27 wt% IFR increased to 32.6%. Their UL‐94 rating reached V‐0 rating. Their peak heat release rate, total heat release, peak smoke production rate and total smoke production were also greatly reduced by 84.4%, 70.1%, 60.3% and 62.5%, respectively. The thermogravimetric‐infrared test results showed that the amount of toxic gas emissions was effectively suppressed. The residual carbon was analyzed by SEM, laser Raman spectroscopy and XRD, and flame retardant mechanism was further investigated. Besides, the addition of this hybrid improved the thermal conductivity of TPU.