Papers by Keyword: PVC

Abstract: This study explores the effect of incorporating Brachirus orientalis shell powder as a natural filler on the mechanical and moisture absorption properties of polyvinyl chloride (PVC) paste composites. Composites were formulated with varying filler loadings (1 wt.%, 2 wt.%, and 3 wt.%) and evaluated through tensile testing and water absorption analysis. The results showed that low filler concentrations (1–2 wt.%) maintained tensile strength and ductility close to those of neat PVC, indicating good filler dispersion and interfacial bonding. However, at 3 wt.% filler content, a reduction in tensile strength and Young’s modulus was observed, likely due to agglomeration and microstructural defects. Despite this, engineering and true tensile strains increased with filler loading, reflecting improved toughness and energy dissipation. Furthermore, water absorption decreased with increasing filler content, demonstrating enhanced resistance to moisture ingress due to the barrier effect of the shell particles. These findings support the potential of B. orientalis shell powder as an eco-friendly reinforcement for improving the toughness and environmental durability of PVC composites.

Abstract: The objective of the present research is to investigate the degradation phenomenon of Polyvinyl Chloride (PVC) cable jacket exposed under accelerated thermally aged at 100°C for 4 days then irradiated under n’s flux of 1.5x 10¹¹ n’s / cm².sec for 1 hr in PARR-2 reactor at PINSTECH. Thermal, mechanical and chemical etc. properties of degraded cable jacket were studied with respect to fresh sample. It was examined that plasticizer content in PVC matrix started to deplete under the effect of temperature which made the matrix more rigid. In addition, the interaction of radiation with polymeric chains weakens the hydrocarbon bonding. The hydrogen and chlorine ions ejected from PVC molecular chains recombine to form hydrogen chloride (HCl) which induces porosity by creating localized pitting. This phenomenon is known as dehydrochlorination which created scissioning in PVC materials. Hence, due to the synergistic effects of temperature and radiation aging, cracks were observed on the outer surface of cable jacket in 2 years equivalent time. This study concludes that cables having PVC insulation are not suitable for long term exposure (i.e. decades) in thermo-irradiation environment.

Abstract: Evaluation of the antibacterial properties of PVC materials used, in particular, in medicine, is becoming increasingly important due to increased sanitary and hygienic requirements. One of the ways to ensure the resistance of PVC materials to microorganisms is modification with wollastonite, the surface of which is activated by quaternary ammonium salts (QASs). QASs are known for their antimicrobial properties. The results obtained indicate that the basic composition of linoleum is somewhat more resistant to gram-positive bacteria than to gram-negative bacteria. The introduction of wollastonite into the PVC compound formulation increases the resistance to the studied groups of microorganisms. It can be concluded that the surface treatment of Mivoll 10-97 by QAS generally improves the bactericidal properties of the material. The results obtained are consistent with the literature data on the activity of cationic QACs in relation to gram-positive and gram-negative bacteria. Quaternary ammonium salts have the ability to be attracted to the outer surface of the negatively charged bacterial membrane due to the positive charge of their molecules.

Abstract: The paper introduces the research background, current status and performance of architectural membrane materials, analyzes the superiority of PVC and PTFE performance, discusses the aging and standards of architectural membrane materials, and conducts new rheological destruction of architectural membrane materials. The aging and relaxation characteristics described by the constitutive equations, and the viscos-elastoplastic rheological failure of architectural membranes for constitutive experiments. At the end of the thesis, the aging performance degradation of architectural membrane materials is discussed, and the aging of architectural membrane materials and the significance of membrane performance degradation are explored in depth.

Abstract: The common blood bag in the market is made from a mixture of PVC and plasticizer. But the a number of occurrences where pockets of heavily polluted bacteria, blood requires blood bags which has the antibacterial characteristic. Antibacterial properties on the bags of blood can be raised with the addition of chitosan. This research aim is to know the influence of chitosan membrane biocomposite PVC-Glycerol against its biological and physical properties. Chitosan dissolved with a concentration of 0 wt/v%; wt/v 0.5%; 1 wt/v%; 1.5 v/wt% wt/v and 2 wt/v% mixed with glycerol with a 1:1 ratio. Then the mixture was mixed with PVC solution 15% and formed into a membrane by using the glass plates. Furthermore, the membranes are characterized using tensile test, hemolytic test, and antibacterial test. The physical characteristics of the tensile test indicate that the elongation percentage was 2.22 – 96.43% and tensile strength was 3.6-8 MPa. The test result of the hemolytic test and antibacterial test showed that biocomposite membrane of PVC-Glycerol-Chitosan are hemocompatible because it has a hemolysis percentage < 5%, while antibacterial test results showed that the membrane has a weak anti-bacterial due to bacterial inhibition zone diameter < 5 mm. Based on the characterization result, biocomposite membrane of PVC-Glycerol-Chitosan can be used for blood bag candidate.

Abstract: Polymer electrolyte films of poly (vinyl) chloride (PVC) as polymer host doped with ionic liquid 1-butyl-3-methylimidazolium trifluoromethasulfonate (BMIMCF₃SO₃) were prepared by solution cast technique. Ionic conductivity was studied for 95 wt.% and 80 wt.% PVC by using Impedance Spectroscopy (IS). Arrhenius and Vogel-Tamman Fulcher (VTF) behavior were observed before and after T_g of the systems. Fourier Transform Infrared (FTIR) study confirmed that complexation occurred between PVC and BMIMCF₃SO₃.

Abstract: An experimental study was conducted to investigate the influence of thermo-oxidative ageing on the tensile properties of PVC/ENR/KCP composites. Sodium dodecyl sulfate filler treatment was also carried out to evaluate the effect of filler treatment. The composites were prepared by melt compounding using Haake Polydrive internal mixer at 140 °C and 50 rpm. Compression-moulded samples were subjected to fracture surface morphology analysis and thermo-oxidative ageing for 3, 5 and 7 days. Thermo-oxidative ageing test indicates that after 3 days of exposure to heat, tensile strength increases, which is due to the further cross-linking reaction. With further exposure for 5 days and 7 days, the tensile strength is reduced probably due to the reduction in flexibility of the cross-link, which affect the stress distribution in the composites.

Abstract: PVC-g-MA has been synthesized to replace the conventional PE-g-MA as the compatibilizer in PVC/ENR/kenaf core powder composites. The presence of the maleic anhydride grafting on PVC was made evident by infrared analysis. PVC/ENR/kenaf core powder composite samples were prepared using Haake Polydrive with the temperature of 140°C, with different kenaf core powder loading (5, 10, 15 and 20 phr) and incorporating PVC-g-MA with 4 phr. The water absorption and thermo-oxidative ageing properties of the composites were investigated. The results indicated that the percent of water uptake decreased with the incorporation of PVC-g-MA. The thermo-oxidative ageing test shows that the ageing properties of PVC/ENR/kenaf core powder composites with the addition of PVC-g-MA are lower compared to PVC/ENR/kenaf without PVC-g-MA.

Abstract: We checker huge quantities of plastic with various forms and types. Major problems caused by these wastes in nature, inside the urban areas and countryside, impose a concern of increasing difficulties for reasons of hygiene and environment Cement concrete is a relatively inert and durable material, compact and waterproof, which can prevent contamination of the environment by living the harmful effects of plastic. In this context it was considered appropriate to include in concrete composition the elements of plastic waste (bag: LDPE) and (bottle: PVC) as a technique for recovery and reuse it’s in the cost. It is a simple and clean procedure to remove these dangerous elements and participate to preserve the nature. Results showed the possibility of using these types of plastic at ambient condition, as a substitution of aggregates, with a slight decrease in compressive strength on the percentage of substitution and an optimal increase in tensile resistance associated with a substantial gain in weight and a high removal rate, especially for PVC. These materials may be intended for the manufacture of components requiring less performance (small works, architectural concrete and decorative elements of the interior, filling, surface coverage and roof.).

Abstract: Using supercritical CO₂ as the foaming agent, rigid polyvinyl chloride (R-PVC) foam sheets were prepared in a continuous extrusion foaming system. The effects of dioctyl phthalate (DOP) on the rheological properties of PVC were investigated using a Brabender torque rheometer while other basic formula remained unchanged. The influences of DOP content on microstructure, mechanical properties and density of PVC micro foamed sheet were investigated with scanning electron microscopy (SEM). The results showed that the addition of DOP resulted in increased flexibility and the elongation at break of the foamed PVC sheet, while the mechanical properties of foamed PVC sheet decreased with the increase of DOP content, implying that excessive addition of DOP will cause gas escape and bubble coalescence in the foaming process. Low density PVC foam sheets with fine cell morphology were obtained when 2 phr DOP was added in PVCformula.