SVIBOR - Project code: 2-15-121

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Project code: 2-15-121


PLASTICIZATION STABILIZATION AND DEGRADATION PROCESSES OF PVC BLENDS


Main researcher: ROJE, URBAN (41413)


Assistants
Type of research: applied
Duration from: 01/01/91. to 12/31/95.
Papers on project (total): 22
Papers on project quoted in Current Contents: 3
Institution name: Tehnološki fakultet, Split (11)
Department/Institute: DEPARTMENT FOR CHEMICAL ENGINEERING LABORATORY FOR PETROCHEMISTRY AND POLYMERS
Address: TESLINA 10, SPLIT
City: 21000 - Split, Croatia
Communication
Phone: 385 (0)21 341633
Fax: 385 (0)21 341624
E-mail: Urban@MATECH.TEHST.HR
Summary: Summary: The PVC thermal degradation of different K-values as well as the thermal degradation of PVC/PMSAN and PVC/ABS polymer blends have been investigated. The kinetic parameters confirm the dependence of thermal stability on K-value. Tg-1/K-value is linear, but the values of the specific heat capacity are not tipical of particular kind of polymerisate. The miscibility of PVC with other polymers is determined from the dynamic viscosity of solutions using the Zelinger-Heidingsfeld criterion of miscibility. With the thermogravimetric investigation of the thermal degradation of PVC/PMSAN (nonisothermal) in nitrogen atmosphere, the kinetic parameters of the first degradation step are determined by isoconversional method after Flynn-Wall and Ozawa. The thermal stability of the blend increases when 2increasing the amount of PMSAN. With the immiscible blends studied by means of dynamic thermogravimetry, PMSAN accelerates the degradation of PVC while PVC retards the degradation processof PMSAN. The blends with more than 50% PMSAN are more stable than PVC. When modifying PVC with ABS, the kinetics of the dehydroclorination process is also being modified, but the basic mehanism of the degradation process remains unchanged. The thermal degradation of this blends depends on the amount of modifier and degradation temperature. The influence effect and changability of the process variables on the apparent activation energy (E) as well as on the preexponential factor (Z) are eliminated by including the compensation parameter (Sp=E/logZ), the constancy of which indicates that the mehanism of thermal degradation of the blend is unchanged. By using TG, DSC and kinetic equations the miscibility (Couchman, Gordon-Taylor, Fox), glass transition temperatures, phase behaviour and parameters of degradation process of PVC/MS-AN-MMA blends as well as interaction of degradation products were investigated. The basic investigations were enlarged on the example of PVC/PBT blend with plasticiser (DOP). At the same time diffusion of degradation products in PVC/MBS blends was investigated and for PVC/ABS blends thermooxidative degradation in air was characterised by infrared spectroscopy.We published 10 papers, 12 synopses were presented on symposiums.One doctor's degree was received, one Mr's degree and 2 invite lecture.

Keywords: Keywords: Plasticization, stabilization and degradation processes, thermal stability, polyblends (mixtures), kinetics data, interaction parameters, PVC, PVC/polimer-blends, PVC/ABS, PVC/PMSAN,PVC/MS-AN-MMA, PVC/PBT, PVC/MBT blends

Research goals: Goals and expected results: The main goal of our investigation, as a contribution to the scientific development, refers to the kinetic study of heterogeneous reactions of polymer blends degradation, while therange of technological use refers to the valorization of the (expected) properties of modified PVC materials on the platform of the maritime-coastal climate. That means developing in studiesas well as establishing the kinetic and thermodinamical parameters related to the processes of plasticization, stabilization and degradation of polymeric systems, for the purpose of becoming acquainted with and comleting the general laws and mechanisms of modification and interaction of polymers. PVC/ABS blends predominantly improve the impact performance, while PVC/PMSAN are to a certain degree the modifiers of thermal stability. The scientific investigation refering to the correlation of structure and to the properties of PVC blends (PVC/ABS, PVC/PSAN, PVC/MS-AN-MMA, PVC/PBT, PVC/MBS) with improved thermal-photolitic caracteristics, contributes to becoming acquainted with the toxicity of degradation-interphas products as well as to the control of waste in environment.
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Last update: 10/10/95
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