Similar articles

Abstract: A series of high molecular weight PVC (HMW-PVC) resin was synthesized by suspension process at various temperatures and compounded to prepare plasticized HMW-PVC. Plasticized HMW-PVC is physically crosslinked by microcrystallites and chain entanglements. The molecular weight and degree of crystallinity of PVC resin increase with decrease of polymeri-zation temperature. More dense physical crosslinking networks are formed in plasticized PVC with the decrease of polymerization temperature of PVC resin. Plasticized HMW-PVC exhibits thermal reversible processability, but the gelation temperature and melt viscosity increase with increasing physical crosslinking density. physical crosslinking also has great effects on the mechanical properties of plasticized HMW-PVC. The compression set and deformation decrease as molecular weight and crystallinity of PVC resin increase, but the softening temperature and tensile strength increase. The crosslinking network of plasticized HMW-PVC is more similar to the dissociable network of gels than to the permanent network of crosslinked rubber and is not stable under stretching at high stress.

[1]Acosta, R. A., Manson, J. A. and Iobst, S. A.,1971. Effect of crystallinity on the glass transition behavior of plasticized Poly(vinyl chloride). Polym. Prepr.,12: 745.

[2]Aharoni, S. M.,1986.Correlation between chain parameters and the plateau modulus of polymer. Macromol., 19: 426.

[3]Attwood, P. C. and Brookman, R.S.,1989. Ultra-high molecular weight PVC resin. J. Vinyl. Technol.,11(1): 42.

[4]Ballard, D. G. H., Burgess, A. N., Dekonink, J. M. et al, 1987.The 'crystallinity' of PVC. Polymer,28: 3.

[5]Bao, Y., Weng, Z., Huang, Z. and Pan, Z.,1996. The crystallinity of PVC and its effect on physical properties. Intern. Polym. Processing,XI(4): 369.

[6]Brookman, R. S.,1988.PVC thermoplastic elastomer. J. Vinyl. Techn.,10(1): 33.

[7]Brookman, R.S., Mazer, P. and Schmeyer, D.,1993. Compounds based on ultra-high molecular weight PVC resin for use in automotive application. J. Vinyl. Technol.,15(1): 9.

[8]Brown, H .R., Musindi, G. M. and Stachuski, Z. H.,1982. Effect of plasticizer concentration and annealing on the structure of PVC. Polymer, 23:1508.

[9]Fukuda, Masaaki; Ishibashi, Seigo; Ikeda Tokuaki, 1987.Manufacture of vinyl chloride polymers with ultrahigh degree of polymerization. Jpn. Kokai Tokyo Koho, Patent, JP 87-246908

[10]Gilbert, M.,1994.Crystallinity in Poly(vinyl chloride). J. Macromol. Sci.: Rev., C34(1): 77.

[11]Hjertberg, T., Dahl, R. and Sorvik, E.,1989. Reaction rate and MWD changes in crosslinking of PVC with dithioltriazine. J. Appl. Polym. Sci.,37: 1239.

[12]Kelnar, I. and Schatz, M.,1993.Silane crosslinking of PVC.1.Grafting of mercaptoalkyloxysilane onto PVC: Properties of the grafted and crosslinked product. J. Appl. Polym. Sci.,48: 657.

[13]Nakajima, A.,1981. Effect of heat history on viscoelastic propertiesof PVC. J. Macromol. Sci.: Polym. Phys., B20(2): 257.

[14]Nethsinghe, L. P. and Gilbert, M.,1988.Structure-property relationships of irradiation crosslinked flexible PVC:1.Structure investigations. Polymer, 29: 1935.

[15]Patterson, C. E., Padgett, S. J., Peppas, N.,1982.Microcrystalline and three-dimensional network structure of plasticized Poly(vinyl chloride). Colloid Polym. Sci.,260(9): 851.

[16]Pezzin, G. and G. Zineli,1968.Influence of molecular weight on some some property of poly(vinyl chloride), J. Appl. Polym. Sci.,12:1119-1236.

[17]Toyo Soda Mfg. Co.. Ltd.,1985.Thermoplastic elastomer compositions. Jpn. Kokai Tokyo Koho, Patent, JP 85-51736