Citation:
JIANG Zhiwei, XUE Jian, DU Zhonghui, TANG Tao, LIU Wenbin. Effect of Foaming Agents on Structure and Properties of Crosslinked Polyvinyl Chloride Foam[J]. Chinese Journal of Applied Chemistry,
;2014, 31(11): 1248-1254.
doi:
10.3724/SP.J.1095.2014.40055
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Polyvinyl chloride(PVC) foam cross-linked by isocyanate and epoxy resin was prepared.Both azobisisobutyronitrile(AIBN) and azodicarbonamide(AC) were used as foaming agents in the prefoam process.Morphologies of foams were characterized by SEM.The effects of particle size,proportion,loading of foaming agents were investigated.The particle size of AIBN has no effect on the cell structure,but the increase of AIBN loading leads to a lower density.The effect of AC particle size on the cell structure is obvious,and the optimal size is 8~20 μm.The cell size mainly depends on the loading of AC.Decomposition of foaming agent was studied by DSC.Both the decomposition behavior of mixed foaming agents and the nucleating effect of AC for the prefoam determine the cell morphology of the resultant foams.The strength increases with the increase of density,but the maximum shear strain appears in the foams with the density of 60~80 kg/m3.
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Keywords:
- cross-linked polyvinyl chloride foam,
- foaming agent,
- isocyanate,
- epoxy
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