Role of plasticizers on the characteristics of poly(vinyl chloride)-membrane lithium-selective electrodes based on phenanthroline derivatives

The Analyst ◽  
1995 ◽  
Vol 120 (9) ◽  
pp. 2381 ◽  
Author(s):  
Tatsuhiro Okada ◽  
Hideki Sugihara ◽  
Kazuhisa Hiratani
Keyword(s):  
Vinyl Chloride ◽  
Poly Vinyl Chloride

New Type of Plasticized Poly(vinyl chloride)

1993 ◽  
Vol 58 (11) ◽  
pp. 2673-2681 ◽  
Author(s):  
Miloslav Kolínský ◽  
Stanislav Ševčík ◽  
Rudolf Lukáš
Keyword(s):  
Vinyl Chloride ◽  
Ethylene Vinyl Acetate ◽  
Polymerization Process ◽  
Low Molecular Weight ◽  
Plasticized Pvc ◽  
Poly Vinyl Chloride ◽  
New Type ◽  
Acetate Copolymer ◽  
Ethylene Vinyl Acetate Copolymer

Low-molecular-weight plasticizers are commonly used in the production of plasticized PVC. However, they readily migrate to the surface of the product, which results in the deterioration of physical properties and contamination of environment. This drawback is eliminated by polymerizing vinyl chloride in water suspension in the presence of a polyester plasticizer and structure stabilizer such as triallyl isocyanurate or the ethylene/vinyl acetate copolymer. The data obtained from water and heptane extractions demonstrate a low extractability of the plasticizer used. Attention is focused on the explanation of the role of structure stabilizers in the polymerization process, and some properties of this new type of plasticized PVC and its possible application areas are discussed.

scholarly journals Orientation of Poly(ε-caprolactone) in Its Poly(vinyl chloride) Blends Crystallized under Strain: The Role of Strain Rate

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5655
Author(s):  
Ruru Wan ◽  
Xiaoli Sun ◽  
Zhongjie Ren ◽  
Huihui Li ◽  
Shouke Yan
Keyword(s):  
Molecular Weight ◽  
Strain Rate ◽  
High Molecular Weight ◽  
Vinyl Chloride ◽  
Draw Ratio ◽  
Bulk Sample ◽  
Axis Orientation ◽  
Poly Vinyl Chloride ◽  
Before And After

The blends of high and low molecular weights poly(ε-caprolactone) (PCL) with poly(vinyl chloride (PVC) were prepared. The samples before and after the crystallization of PCL were uniaxially stretched to different draw ratios. The orientation features of PCL in a stretched crystalline PCL/PVC blend and crystallized from the amorphous PCL/PVC blends under varied strains were studied by wide-angle X-ray diffraction (WAXD). It was found that a uniaxial stretching of crystalline PCL/PVC blend with high molecular weight PCL results in the c-axis orientation along the stretching direction, as is usually done for the PCL bulk sample. For the stretched amorphous PCL/PVC blend samples, the crystallization of high molecular weight PCL in the blends under a draw ratio of λ = 3 with a strain rate of 6 mm/min leads to a ring-fiber orientation. In the samples with draw ratios of λ = 4 and 5, the uniaxial orientation of a-, b-, and c-axes along the strain direction coexist after crystallization of high molecular weight PCL. With a draw ratio of λ = 6, mainly the b-axis orientation of high molecular weight PCL is identified. For the low molecular weight PCL, on the contrary, the ring-fiber and a-axis orientations coexist under a draw ratio of λ = 3. The a-axis orientation decreases with the increase of draw ratio. When the λ reaches 5, only a poorly oriented ring-fiber pattern has been recognized. These results are different from the similar samples stretched at a higher strain rate as reported in the literatures and demonstrate the important role of strain rate on the crystallization behavior of PCL in its blend with PVC under strain.

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