Longsiri Krittaphorn, Mora Phattarin, Peeksuntiye Watcharapong, Jubsilp Chanchira, Hemvichian Kasinee, Karagiannidis Panagiotis, Rimdusit Sarawut
Research Unit in Polymeric Materials for Medical Practice Devices, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok, 10330, Thailand.
Department of Chemical Engineering, Faculty of Engineering, Srinakharinwirot University, Nakhonnayok, 26120, Thailand.
Bioresour Bioprocess. 2022 Aug 20;9(1):85. doi: 10.1186/s40643-022-00577-5.
This research aims to modify ultrafine fully vulcanized powdered natural rubber (UFPNR) prepared by emulsion graft-copolymerization with styrene (St) and acrylonitrile (AN) monomers onto deproteinized natural rubber (DPNR). The effects of monomers content and St/AN weight ratio on grafting efficiency and thermal stability of the developed DPNR-g-(PS-co-PAN) were investigated. The results showed that grafting efficiency was enhanced up to 86% with monomers content 15 phr and weight ratio St:AN 80:20. The obtained DPNR-g-(PS-co-PAN) was radiated by an electron beam at various doses, followed by a spray drying process to produce UFPNR. The obtained modified UFPNR particles irradiated at dose up to 300 kGy were relatively spherical with a particle size of approximately 4.4 µm. Furthermore, the degradation temperature of 5wt% loss (T) of UFPNR was found in the range of 349-356 °C. The results revealed that the modified UFPNR is suitable as a toughening filler for a broader spectrum of polymers.
本研究旨在通过乳液接枝共聚法，将苯乙烯（St）和丙烯腈（AN）单体接枝到脱蛋白天然橡胶（DPNR）上，对制备的超细完全硫化粉末天然橡胶（UFPNR）进行改性。研究了单体含量和St/AN重量比对所制备的DPNR-g-(PS-co-PAN)接枝效率和热稳定性的影响。结果表明，当单体含量为15 phr且St:AN重量比为80:20时，接枝效率提高至86%。将所得的DPNR-g-(PS-co-PAN)用不同剂量的电子束辐照，随后进行喷雾干燥工艺以制备UFPNR。在高达300 kGy的剂量下辐照得到的改性UFPNR颗粒相对呈球形，粒径约为4.4 µm。此外，发现UFPNR在5wt%失重时的降解温度（T）在349 - 356 °C范围内。结果表明，改性UFPNR适合作为更广泛聚合物的增韧填料。
