Effects of coagent incorporation on properties of ultrafine fully vulcanized powdered natural rubber prepared as toughening filler in polybenzoxazine

SPE Polymers

article

Rattanaporn Wongkumchai¹  Lunjakorn Amornkitbamrung¹  Phattarin Mora¹  Chanchira Jubsilp²  Sarawut Rimdusit¹ 

[1] Research Unit in Polymeric Materials for Medical Practice Devices, Department of Chemical Engineering, Chulalongkorn University;Department of Chemical Engineering, Srinakharinwirot University;Research Network NANOTEC-CU on Advanced Structural and Functional Nanomaterials, Chulalongkorn University

关键词: coagent;    polybenzoxazine;    radiation vulcanization;    toughening filler;    ultrafine fully vulcanized powdered natural rubber;   

DOI  :  10.1002/pls2.10038

学科分类：社会科学、人文和艺术（综合）

来源: Wiley

【 摘 要 】

Ultrafine fully vulcanized powdered natural rubber (UFPNR) is a renewable material that is promising for industrial application as a toughening filler in polymer matrix. In this work, effects of coagent on properties of UFPNR produced by radiation vulcanization and spray-drying was systematically investigated, in which trimethylol propane trimethaacrylate (TMPTMA) was used as coagent. The crosslinking density of UFPNR could be enhanced by increasing radiation dose from 50 to 350 kGy and it was further enhanced by using TMPTMA as coagent during the production process. UFPNR with the smallest particle size of 3.9 ± 1.8 μm and highest thermal stability ( T d5  = 347°C) could be obtained by using TMPTMA with the highest content of 9 phr. The results suggested that polymer chains of natural rubber were more packed into smaller particle as they were more crosslinked by the coagent. Finally, an application of UFPNR as a toughening filler in polybenzoxazine was demonstrated. The highest impact strength improvement of 20% was achieved by incorporation of 3 phr UFPNR in polybenzoxazine.

【 授权许可】

CC BY