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A Review on Poly (Vinyl Chloride) and Its Modification by Crosslinking and Grafting

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A Review on Poly (Vinyl Chloride) and Its Modification by Crosslinking and Grafting id2293015 pdfMachine by Broadgun Software - a great PDF writer! - a great PDF creator! - http://www.pdfmachine.com http://www.broadgun.com Volume 4 Issue 2 Research &ISSN :R 2249e - v88i77ews In Polymer Review RRPL, 4(2), 2013 [73-80] A review on poly (vinyl chloride) and its modification by crosslinking and grafting Ajay Singh1*, M.S.M.Rawat2 1Deptt. of Chemistry, Uttaranchal Institute of Technology. Dehradun, Uttaranchal University, Uttarakhand, (INDIA) 2Deptt. of Chemistry, H.N.B.Garhwal University. Srinagar, Uttarakhand, (INDIA) E-mail : ajay21singh @yahoo.com; [email protected] ABSTRACT KEYWORDS PVC is the most versatile vinyl polymer. As such PVC has limited uses but Polymer; by adding various additives like plasticizers or by doing some chemical PVC; modifications, its properties are altered up to great extent. Various studies Crosslinking; on PVC and its modification have been reviewed in this paper. FT-IR and Grafting; TGA/DTA have been mainly used for the characterization. Thermal stabil- FT-IR; ity of the modified PVC was observed to be increased in maximum studies Thermal stability. but in some cases it decreased after crosslinking. Properties of the PVC have been altered up to desired extent by using bifunctional crosslinkers to find wide applications like in construction, household applications, bio- medical applications etc. 2013 Trade Science Inc. - INDIA INTRODUCTION struction. The ability to be used in either the rigid or soft (plasticized) forms doubles the market for this excep- Poly (vinyl chloride) i.e. PVC is one of the most tionally safe material. The material is available in clear or versatile bulk polymers & widely used thermoplastic coloured formats and it is durable, weatherproof, flame vinyl polymer. Vinyl polymers make up largest family of resistant with good overall mechanical properties. The ‘Greenpeace’ and polymers. A thermoplastic, in general, is like wax which material has come under attack by “thermo- can be melted and shaped several times. The other environmental groups - all of which ignore the im- ” materials are either crystalline or amorphous. plastic mense service that the material plays in the modern in- Advances in chemistry have made the distinction be- dustrial society. PVC is claimed to be dangerous by some tween crystalline and amorphous forms, since some but it is the main material used for blood bags, medical materials like nylon are formulated both as a crystalline tubing and has been responsible for saving countless lives. material and as an amorphous material. PVC is pro- PVC has been the subject of more research than most duced by polymerization of the monomer vinyl chloride other plastic materials and is acknowledged to be safe which consists 57% of its mass of chlorine, thus creat- polymer by number of researchers. ing a given mass of PVC requires less petroleum than most of the other polymers. HISTORY OF PVC In terms of revenue generated, PVC is one of the most valuable products of the chemical industry. Glo- It was accidentally discovered on at least two dif- bally, over 50% of PVC manufactured is used in con- ferent occasions in the 19th century, first in 1835 by 74 A review on poly (vinyl chloride) and its m.odification by crosslinking and grafting RRPL, 4(2) 2013 Review Henri Victor Regnault and in 1872 by Eugen Baumann. advances in chemistry make it possible for a chemist to On both occasions, the polymer appeared as a white construct a material to be either thermoset or thermo- solid inside flasks of vinyl chloride that had been left plastic. The main difference between the two classes of “linear” exposed to sunlight. In the early 20th century, the Rus- materials is whether the polymer chains remain sian chemist Ivan Ostromislensky and Fritz Klatte of and separate after molding (like spaghetti) or whether the German chemical company Griesheim-Elektron both they undergo a chemical change and form a three di- “cross-linking”. Crys- attempted to use PVC in commercial products, but dif- mensional network (like a net) by ficulties in processing the rigid, sometimes brittle poly- tallinity of the polymer also affect its properties. Crys- mer blocked their efforts. In 1926, Waldo Semon of tallinity depends on the size of side groups and regular- B.F. Goodrich developed a method to plasticize PVC ity of chain. Increased crystallinity enhances mechani- by blending it with various additives. The result was a cal properties. Due to mobility of chains with respect to more flexible and more easily processed material that each other, crosslinking may affect viscoelastic prop- soon achieved widespread commercial use[1]. erty. Branching characteristics of a polymer affect the The presence of chlorine in PVC hinders burning visocelastic and other physical properties. A study on through formation of hydrogen chloride as it is incom- branching characteristics of poly (vinyl chloride) was bustible (prevents access of oxygen to the combustion done by Kent B. Abbs[4]. Different ways to determine zone) and reacts with free radicals acting as terminator branched structures in PVC were discussed and a brief for the combustion propagation reactions. Thus by vir- review of recent studies by[13] C NMR was given. The tue of its chemical nature PVC achieves the kind of latter method has not only proved capable of elucidat- flame retardancy while this property is absent in other ing the branching structure in PVC, but it also exhibited plastics. Various inorganic compounds including anti- higher accuracy than conventional procedures. Com- mony oxide, zinc borate, alumina trihydrate, molybde- mon PVC grades were found to contain 2-3 pendant num oxide, compounds of lead etc have been used as chloromethyl groups per 1,000 C and about 1 long fire stabilizers for PVC[2]. branch was found in 2,000 C. Calculations showed that if long branches were associated with tertiary chloride MODIFICATION OF PVC which accounts for most of the observed degradation in the polymer. Reduced PVC exhibited annealing ef- As such PVC has limited uses but by adding vari- fects similar to those observed for LDPE (low dense ous additives like plasticizers or by doing some chemi- polyethylene), although the number of branches was cal modifications, its properties are altered up to great closer to that characteristic of HDPE (high dense poly- extent to find wide applications in various fields. ethylene). Degraded PVC, which was reductively To provide the extra desired physical or chemical dehalogenated, exhibited a lower tendency to crystal- properties in a particular polymer, some specialty addi- lize. This was believed to be the result of crosslinking tives are added, known as polymer additives. Buty- reactions which decreased molecular mobility. lated hydroxytoluene (BHT) is added to get antioxi- Thai Hoang & Neil Varshney[5] studied the dant property in the polymer. Quaternary ammonium thermomechanical characteristics (glass transition tem- + salts (R4N salt), or carbon black is added as an anti- perature (Tg), softening point (Ts), and linear thermal static agent. Epsom Salts (MgSO ) provides flame expansion coefficient) of rigid PVC crosslinked by a 4 ’s are Retardancy. Hexane, sodium bicarbonate, CFC peroxide in the presence of trimethylolpropane added to get foaming property. Fatty acids provide lu- trimethacrylate. Thermomechanical analysis (TMA) is bricating action. Hydroxybenzophenone can be added an effective method for determination of dimension and as Ultraviolet stabilizers. Sulfur is used as vulcanizing thickness changes and thermal characteristics. They agents. Organo-titanium compounds or silanes as cou- observed probe load of 0.05 N suitable to evaluate pling agents and di-iso-octyl phthalate are added as expansion, softening and contraction of the crosslinked plasticizers[3]. PVC samples and higher mechanical strength of Crosslinking and grafting are very useful techniques crosslinked PVC samples than those of the for chemical modification of any polymer. Again, the uncrosslinked samples. Research & Reviews In Polymer RRPL, 4(2) 2013 Ajay Singh and M.S.M.Rawat 75 Review In another study, PVC was crosslinked by a new the monomer, giving rise to homopolymerization rather peroxide (1,1-di-(t-amylperoxy) cyclohexane) (DAPC) than grafting. But, things stand differently with bifunc- in the presence of trimethylolpropane trimethacrylate tional monomers like the dimethacrylates. The (TMPTMA). It was also observed that the gel content crosslinking of PVC in the presence of ethylene glycol and tensile properties of the peroxide crosslinked PVC dimethacrylate was studied by microcalorimetry, ESR samples were higher than those of the uncrosslinked and by structure investigation. A substantial part of the PVC samples and they observed enhanced penetra- monomer polymerizes already during processing and tion resistance and service temperature of PVC by such storage. High concentration of free radicals of the meth- type of peroxide crosslinking[6]. acrylate type may be frozen in the PVC matrix and be- Fiaz M & Gilbert M[7] crosslinked the poly (vinyl come re-activated at higher temperature. The radicals chloride) by aminosilanes. They have shown that disappear and reappear upon prolonged storage. The crosslinking improved penetration resistance of PVC different stages of the grafting and crosslinking reaction due to formation of gel part in the material. Crosslinking were discussed. of PVC and other thermoplastics has long been used Jagdish C & his coworkers[10] have developed a as an effective way of improving mechanical properties good process for forming a crosslinked PVC foam by at elevated temperatures. Peroxide cross-linking of rigid means of radiation crosslinking. PVC was also studied by Bowmer T.N & his cowork- Many attempts to improve the biocompatibility of ers[8] in a different manner. They studied radiation PVC have been done. This includes polymer surface crosslinking of plasticised PVC in the presence of modification with endpoint attachment of heparin. PVC polyfunctional monomeric additives and they employed was chemically modified using poly (ethylene glycol) the modified PVC in the manufacture of wire and cable i.e.
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