Polypropylene glycol degradation

Some munition binders are heat sensitive and degrade upon heating. Polypropylene-glycol-urethane, for example, will degrade when heated to 160°C (320°F) and held for 10 hours. 

HMX from PBX compositions developed after 1974 The binders which are incorporated in these post-1974 compositions are selected for their heat sensitivity. For example, polypropylene-glycol-urethane can be degraded when heated to 160°C for 10 hours. The HMX can then be extracted with methylene chloride. 

Degradation reactions Degradation of polypropylene by shear-heating, degradation of PET with ethylene glycol... 

Non-bioabsorbable sutures are defined by their resistance to degradation by living tissues. They are most useful in percutaneous closures. Synthetic, non-bioabsorbable, monofilament sutures include nylon, polypropylene, and polybutester sutures, while synthetic, non-bioabsorbable, multifilament (braided) sutures are composed of nylon and polyester. Polybutester, developed in 2000, is a block copolymer that contains butylene terephthalate and telramethylene ether glycol. Metallic fibers such as steel fibers are also used extensively for suturing. 

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