1
|
Luo D, Pei X, Fu H, Yang X, Long S, Zhang L, Gong W. Modification of sodium bicarbonate and its effect on foaming behavior of polypropylene. E-POLYMERS 2021. [DOI: 10.1515/epoly-2021-0032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
As a potential physical blowing agent, sodium bicarbonate (SB) is environmentally friendly and low in cost, but its low decomposition temperature cannot meet the requirements of polyolefin foam materials. Herein, for enhancing the thermal properties of SB, a modified way was offered to fabricate various SB-based capsules via suspension polymerization. As the modified SB-based capsules, epoxy resin (EP) accompanied with several organic acids was successfully coated on the surface of SB, serving as heat-insulation layer of SB. Various physicochemical characterizations provided reliable evidences for the good coating effect, and the thermal performance of the modified SB was improved. Further, the composite SB capsules were applied for the foaming of polypropylene (PP), and the foaming behavior of the SB-based capsules in PP was significantly improved, with more uniform distribution, smaller cell diameter, and higher cell density. In all, this work fully proved that the coated shells enhanced the thermal properties of SB, and the modified SB capsules significantly improved the foaming quality of foamed PP.
Collapse
Affiliation(s)
- Dan Luo
- School of Materials and Architectural Engineering, Guizhou Normal University , Guiyang 550025 , China
- Guizhou Functional Polymer Materials Science and Technology Innovation Talent Team , Guiyang 550025 , China
| | - Xianglin Pei
- School of Materials and Architectural Engineering, Guizhou Normal University , Guiyang 550025 , China
- Guizhou Functional Polymer Materials Science and Technology Innovation Talent Team , Guiyang 550025 , China
| | - Hai Fu
- School of Materials and Architectural Engineering, Guizhou Normal University , Guiyang 550025 , China
- Guizhou Functional Polymer Materials Science and Technology Innovation Talent Team , Guiyang 550025 , China
| | - Xin Yang
- School of Materials and Architectural Engineering, Guizhou Normal University , Guiyang 550025 , China
| | - Siyu Long
- School of Materials and Architectural Engineering, Guizhou Normal University , Guiyang 550025 , China
| | - Linyu Zhang
- School of Materials and Architectural Engineering, Guizhou Normal University , Guiyang 550025 , China
| | - Wei Gong
- School of Materials and Architectural Engineering, Guizhou Normal University , Guiyang 550025 , China
- Guizhou Functional Polymer Materials Science and Technology Innovation Talent Team , Guiyang 550025 , China
| |
Collapse
|
2
|
Rigid polyurethane/expanded vermiculite/ melamine phenylphosphate composite foams with good flame retardant and mechanical properties. E-POLYMERS 2019. [DOI: 10.1515/epoly-2019-0060] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractExpanded vermiculite (EV) was introduced into rigid polyurethane (RPU) foam. The incorporation of 10 wt% EV into RPU foam increases the compressive strength and the flexural strength by 82% and by 115%, respectively compared with untreated RPU foam. The LOI of RPU foam containing 20 wt% EV is only 19.5%. To further improve the flame retardancy of RPU/EV composite foam, melamine phenylphosphate (MPP) was synthesized and introduced into the RPU/EV composite foam. The RPU/EV composite foam with 15% MPP (sample RPU/EV/MPP15) has a LOI of 27.5% and a V0 rating in the vertical UL-94 test. The PHRR and THR of sample RPU/EV/MPP15 decrease by 39% and 24%, respectively, compared with the ones of untreated RPU/EV composite foam. The compressive strength and flexural strength of RPU/EV/MPP composite foam gradually decrease with the increase in the amount of MPP. TGA results indicated that the addition of MPP further increase the residue char of the RPU/EV composite foam.
Collapse
|