Changes in Some Properties of the Chlorinated Polyvinyl Chloride in the Course of Chlorination

Takadono, Sumio; Yoshida, Yukio; Fukawa, Koji

doi:10.1246/nikkashi1898.67.11_1928

Cited by 3 publications

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“…The CPVC obtained by the various processes (9,10,20,22) differs in many chemical physical properties. According to the most recent studies carried out with infrared (5,8,22) and NMR techniques (13,18,19), these differences are not justified by the determination of the struc ture, in terms of the ratio between 1.2 and 1.1 dichloroethylene units.…”

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“…However data concerning the properties of the CPVC obtained by the various hetero geneous type processes ( swollen and unswollen ) are scarce. It is known that heterogeneous processes yield CPVC which is more or less nonhomogeneous regarding chlorine content in the macromolecule (20,22) and which also contains the structure of the block copolymer between vinyl chloride and postchlorinated vinyl chloride unit (I). A recent study (9) compares the dynamic-mechanical properties of CPVC ob tained by swollen and unswollen heterogeneous processes, and in the latter case a blend of PVC and CPVC is undoubtedly obtained.…”

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Blends of Chlorinated and Normal PVC

Ajroldi

Gatta

Gugelmetto

et al. 1971

Multicomponent Polymer Systems

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Poly(vinyl chloride) (PVC) was chlorinated with or withoutCHCls as swelling agent, to provide samples of CPVC for study. The following properties were determined: thermal stability (dehydrochlorination), Vicat softening point, dynamic modulus, impact strength at various temperatures, and creep at 80° and 100°C. All these properties depend on both chlorine content and type of chlorination process. At constant chlorine content the CPVC samples prepared in the presence of the swelling agent have higher thermal stability, higher Vicat softening point, lower impact strength, and lower creep deformation than the samples prepared without the swelling agent. The logarithm curves of dynamic modulus vs. temperature of the blends of PVC with CPVC of high chlorine content, exhibit a sharp flex at the glass transition temperature of PVC. Chlorination without a swelling agent results in a blend between the PVC and CPVC of various chlorine contents. Moreover PVC and CPVC with high chlorine content are incompatible. When mixed together, heterogeneous blends are obtained."pvuring the past few years many studies have been made to find an industrial way to obtain postchlorinated poly (vinyl chloride) (CPVC). The processes which, for simplicity and low cost, seem most promising are those in which PVC is chlorinated in the heterogeneous phase. These processes can be carried out either in the presence or ab sence of a liquid-dispersing phase and with the PVC either swollen by a solvent (swollen process or gel phase) (4,14) or in the unmodified powder state (unswollen process) (7, 21).

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confidence: 99%

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confidence: 99%

Blends of Chlorinated and Normal PVC

Ajroldi

Gatta

Gugelmetto

et al. 1971

Multicomponent Polymer Systems

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Processability characteristics of chlorinated poly(vinyl chloride)

Krishnan

Singh

Thampy

et al. 1974

J. Polym. Sci. Polym. Chem. Ed.

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Chlorinated poly(vinyl chloride) (CPVC) is known to have a higher softening temperature than conventional poly(vinyl chloride) (PVC). Its processability characteristics are, however, different; it has been reported that CPVC is more difficult to process. However, only limited information on the processability characteristics is available. This paper describes some studies of the flow behavior of CPVC melts in a capillary rheometer. The true melt viscosity and activation energy were determined between 190° and 210°C for a number of samples, and they appear to be related to the cohesive energy density of the samples. It was observed that melt fracture, i.e., gross distortion of the extrudate, occurs even at low shear rates in samples having a high chlorine content. This has been attributed to the relatively high pressures that have to be used, the pronounced non‐Newtonian nature of the melt, and melt elasticity. It is postulated that melt elasticity could result from crosslinking at the site of the double bond which is known to be formed by dehydrochlorination.

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The Chemical Modification of Polyvinyl Chloride

Naqvi

1987

Journal of Macromolecular Science, Part C: Polymer Reviews

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Changes in Some Properties of the Chlorinated Polyvinyl Chloride in the Course of Chlorination

Cited by 3 publications

References 0 publications

Blends of Chlorinated and Normal PVC

Blends of Chlorinated and Normal PVC

Processability characteristics of chlorinated poly(vinyl chloride)

The Chemical Modification of Polyvinyl Chloride

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