Crosslinking Modification Of Poly (Vinyl Chloride) Paste Resin

The crosslinking modification of poly(vinyl chloride) (PVC) paste resin has been investigated by using 2-dibutylamino-4,6-dimercapto-s-triazine (DB) and N-(2-aminoethyl)-3-aminopropyltrimethoxysilane (ATMS) as crosslinking agents separately. Gel content was used to measure the degree of crosslinking; the molecular structure, surface morphology, dynamical mechanical property and thermal decomposition behavior of PVC were studied by fourier transform infrared spectrometer (FTIR), atomic force microscopy (AFM), dynamical mechanical thermal analyzer (DMTA) and thermal gravimetric analyzer (TG) respectively. The results indicated that PVC could be effectively crosslinked by DB and ATMS. For the DB crosslinking system, the optimum crosslinking temperature and time were determined; For the ATMS crosslinking system, the optimum grafting temperature and time, the optimum amount of ATMS and stabilizer were also determined. The molecular structure of crosslinked PVC was confirmed. The surface morphology analysis indicated that the crosslinking structure could be influenced by the morphology and molecular structure of the crosslinking agent. The results also showed that the crosslinking of PVC could lead to improvement of dynamical mechanical property and thermal stability.