Results 1 - 10 of 2211
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[en] The peel strength of polyvinyl chloride (PVC) edge band on curved edge part was tested by using experimental method which was conducted to define the influence of many factors, including temperature of applying glue, glue dosage and feed rate on peel strength of edge band from curved edge part. The results showed that the temperature of applying glue, glue dosage and feed rate have a great effect on the peel strength of PVC edge band. The obtained optimum technical parameters were respectively as follow: temperature of applying glue was 140∼150°C, glue dosage was 363∼379g/m2 and feed rate was 13∼15m/min. (paper)
[en] Process for preventing the modification of a polymer whose molecule contains a halogen, under the effect of an ionizing radiation, consisting in adding to this polymer a heat stabilizing metal-based agent, and a mercaptan, characterized in that hydroquinone is also added
[fr]Procede pour empecher l'alteration d'un polymere dont la molecule renferme un halogene, sous l'effet d'un rayonnement ionisant, qui consiste a incorporer a ce polymere un stabilisant a la chaleur, a base de compose metallique, et un mercaptan, caracterise en ce qu'on incorpore egalement de l'hydroquinone
[en] Sugarcane bagasse is divided into two major components. They are pith and rind. Pith is the inner part of sugarcane bagasse while rind is the outer part of it. In this study, the flexural properties of pith reinforced poly (vinyl chloride) composites were compared to that of rind composites with the same matrix in variation of fibre content. The composites were produced by compression moulding method. The fibre contents were 10%, 20%, 30%, 40%, and 50% in weight. Three-point bending tests were carried out to measure the flexural properties of the composites. It has been found that, in general, the addition of fibre improved the flexural modulus of the materials. Meanwhile, the rind composites were of superior flexural properties compared to the pith composites.
[en] The complexation of N,N'-4,5-(ethylenedioxy)benzenebis(salicylideneimine), (salphenH2) with uranyl ion was studied in acetonitrile solution spectrophtometrically, and the formation constant of the resulting 1 : 1 complex was evaluated. The salphenH2 ligand was used as an ionophore in plasticized poly(vinyl chloride) (PVC) matrix membrane sensor for uranyl ion. The prepared sensors exhibited a near Nernstian response, 28.0-30.9 mV/decade for uranyl ion over the concentration range 1.0 x 10-2 to 1.0 x 10-6 M with a limit of detection of 3.2 x 10-7 M. The proposed electrode could be used at a working pH range of 1.5-4.0
[en] Up to 1980 the cable industry has used halogen-containing compounds on a large scale which have excellent properties, but are hazardous if fire breaks out. Hence halogen-free compounds have an increasing share in today's market. Halogen-free polymer developments have shown difficulties optimizing interdependent properties such as cross-linking, to meet the German standards and ease of extrusion. Cross-linking by radiation, e.g. electron beam, allows changing of specific properties to meet special requirements. 1 tab
[en] Full Text: In field of few (0,1 - 10 mass%) components concentration an electrical aging of PEVC-PP mixture gained from fusion and PS-PVC prepared from solution has been under research. It's discovered that a few addition of PE (1-2 mass%) to PP considerably intensifies the electrical properties changing and PP erosion. It's also observed a quick abnormal destruction of PS-PVC during addition of PVC with concentration of 1% mass but few of PS don't influence a collapse of PVC
[en] A major goal of polydimethylsiloxane (PDMS) microfabrication is to develop a simple and inexpensive method for rapid fabrication. Despite the recent advancements in this field, facile PDMS microfabrication on non-planar surfaces remains elusive. Here we report a facile method for rapid prototyping of PDMS microdevices via µPLAT (microscale plasma-activated templating) on non-planar surfaces through micropatterning of hydrophilic/hydrophobic (HL/HB) interface by flexible polyvinyl chloride (PVC) hollow-out mask. This mask can be easily prepared with flexible PVC film through a cutting crafter and applied as pattern definer during the plasma treatment for microscale HL/HB interface formation on different substrates. The whole process requires low inputs in terms of time as well as toxic chemicals. Inspired by liquid molding, we demonstrated its use for rapid prototyping of PDMS microstructures. Following the proof-of-concept study, we also demonstrated the use of the flexible hollow-out mask to facilitate cell patterning on curved substrates, which is difficult to realize with conventional methods. Collectively, our work utilizes flexible and foldable PVC film as mask materials for facile microscale HL non-planar surface modification to establish a useful tool for PDMS prototyping and cell patterning. (paper)
[en] The studies presented enable to evaluate the survival rate of the protozoons in contact with the studied polymers-folis, from polyethylene PE, polyvinyl chloride P-25, polyester E1 and irradiated collagen L7. It can also be established whether the change of certain morphodynamic parameters could be used to evaluate biological usefulness of plastics. Stereometric method and factor analysis were used in the studies. On the basis of the obtained data polyvinyl chloride P-47 was well assessed, while irradiated collagen L7 showed most negative features. (author)
[en] The use of biobased plasticizers with low toxicity and good compatibility with polyvinyl chloride (PVC) has become more attractive in the recent years in contrast with phthalate derivatives. In this study, a glycerol derivative plasticizer (triacetin—TAG) was tested as a secondary plasticizer for PVC. TAG was added to PVC formulations from 10 up to 20 phr. The increase of the plasticizer content had a great influence on the properties of PVC samples. The good miscibility and therefore the efficient plasticization action of the TAG were supported by DMA results, since narrow peaks of tan (δ) curves and reduction of the Tg values for the samples were observed. The ensuing PVC demonstrated good rheological properties and thermal stability up to 200 °C. Finally, the presence of TAG reduces the hardness of materials and does not increase their density.
[en] A preliminary study of a resonator panel and diffuser using polyvinyl carbonate (PVC). The resonator and diffuser parameters of the panels are tested in the chamber reverberation chamber and anechoic chambers in the laboratory of acoustic physics, the physics department of FIA ITS. The resonator parameter tested is in the anechoic chamber by looking spectral for SPL differences when without and the panel existed. As a diffuser, scattering patterns are tested in the anechoic chamber, while scattering coefficients (S) at a reverberation chamber. In this paper, the panel of resonators in the test made from pipes of 0.5″, 1″ and 3/2″ diameters with panel sizes are 60 cm x 60 cm. base on measurement, the panel has a resonance frequency at 540 Hz. While as a diffuser, the scattering coefficient (S) value for a small pipe is 0.98 at a frequency of 125 Hz with an angle of 0o, a medium pipe is 0.99 at a frequency of 500 Hz with an angle of 30°, a large pipe is 0.93 at a frequency of 500 Hz with Angle 0°. (paper)