Polybutyl Cyanoacrylate

Hickey and co-workers [43] investigated the effect of the pyridine and group identity in the thermal degradation of polybutyl cyanoacrylate  

The thermal stability of cyanoacrylate polymers is relatively low, and taken in conjunction with a low softening temperature imposes an operating limit of about 

Results from Py-GC-MS analysis of the gaseous products show that when the pyridine-initiated sample is pyrolysed for four seconds at 160 °C and at 220 °C pyridine is released from the system. The behaviour differs from the TPP-initiated system, in that it is not until the higher temperature that TPP is detected as being released as a gaseous product of thermal degradation. 

The presence of TPP significantly affects the mass loss characteristics of the polymer, but this may not be a simple increase in thermal stability. It is possible that a depolymerisation/re-polymerisation reaction is occurring. 

Sample Initiator Original molecular mass (M ) Mass loss without TPP (%) Mass loss with TPP (%) 

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Alkyl-2-cyanoacrylates are readily polymerized in the presence of weak bases such as water. Because of the presence of the strong polar cyano pendant group these polymers (e.g. Super Glue) are excellent adhesives. Polybutyl-2-cyanoacrylate is tolerated by the body better than its lower alkyl homo-logues. Hence polybutyl-2-cyanoacrylate is used as an adhesive aid to stop bleeding in some surgical operations. 

Other nitrogen containing polymers which have been subjected to thermal decomposition studies include aromatic polyester imides containing 2,7-bis(4-aminobenzoyloxy) naphthalene groups [16], poly-4-vinylpyridine [17], poljmrethanes [18], polybutyl cyanoacrylate [19], and polypropyl acrylate [20]. 

Products obtained by pyrolysis of other polymers is reviewed in Table 4.5. Some specific applications of the chromatography-MS technique to various types of polymers include the following PE [34,35], poly(l-octene) [29], poly(l-decene) [29], poly(l-dodecene) [29], CPE [36], polyolefins [37, 38], acrylic acid-methacrylic acid copolymers [39, 40], polyacrylate [41], nitrile rubber [42], natural rubbers [43, 44], chlorinated natural rubber [45, 46], polychloroprene [47], PVC [48-50], polysilicones [51, 52, 53], polycarbonates [54], styrene-isoprene copolymers [55], substituted olystyrene [56], PP carbonate [57], ethylene-vinyl acetate [58], Nylon 66 [59], polyisopropenyl cyclohexane-a-methyl styrene copolymers [60], cresol-novolac epoxy resins [61], polymeric flame retardants [62], poly(4-N-alkyl styrenes) [63], polyvinyl pyrrolidone [64], polybutyl-cyanoacrylate [65], polysulfides [66], poly(diethyl-2-methacryl-oxy) ethyl phosphate [67, 68], polyetherimide [69], bisphenol-A [70], polybutadiene [71], polyacenaphthalene [72], poly(l-lactide) [73], polyesterimide [74], polyphenylene triazine [75], poly-4-N-vinyl pyridine [76], diglycidylether-bisphenol-A epoxy resins [77], polyvinylidene chloride [78] and poly-p-chloromethyl styrene [79]. 

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