Carboxy-terminated polyisobutylene

Our goal in this work has been the development of a terminally bifunctional liquid rubber. Carboxy-terminated polyisobutylene (CTPIB) approaches a terminally bifunctional polymer. It is made by the ozoniza-tion in the presence of pyridine of a high molecular weight, low unsaturation piperylene-isobutylene copolymer as shown in Reaction 1. 

The terminally bifunctional prepolymer, carboxy-terminated polyisobutylene, is prepared by the pyridine-modified ozonization of a copolymer of piperylene (2-4% ) and isobutylene. Figure 1 shows a block diagram of the process. The high molecular weight elastomer can be prepared by the conventional techniques of isobutylene-diene copoly-... 

Occasionally, low molecular weight polymers are required as sealants, adhesives, or in rocket solid propellants. F. P. Baldwin and co-workers report on the manufacture of a low molecular weight carboxy terminated product made by depropagating ozonization of a higher molecular weight polyisobutylene. 

PMR spectroscopy has been applied to the characterisation of a wide range of homopolymers including PMMA [286-289], PVC [290-294], PS [293, 295, 296], polyvinyl ethers [297-300], polyacrylic acid [301], poly(methyl-a-chloroacrylate) [302], carboxy terminated polybutadiene [303], poly(a-methyl styrene) [304], natural rubber [305-307], chlorinated polyisobutylenes [308], sulfonated PS resins [309, 310], polyvinyl phenyl ether [311], lactone polyester [312], chlorinated PVC [313], PC [314], poly 1,3 butadiene [315], poly-2-allyl phenyl acrylate [316], poly(4-methyl-pentene-1) [317], polymethacrylic acid [318], PP [296], cyclic ethers [319], polymethacrylonitrile [320], poly(a-methyl styrene) tetramer [321], PEG [322], PE [289], polyacrylamide [311], polymethylacrylamide [323], polypyrrolidone [324], polychloroprene [325], phenol formaldehyde resins [326, 327], Nylon 66 [328], polyvinylidene fluoride [329], polyvinyl formate [330], polyacrylonitrile [331], epoxy resins [332], allyl biguanide [333], poly(2-isopropyl-2-oxazollines) [334] and trehalose vinyl benzyl ether [335]. 

---