Radiation-induced degradation of poly(3-hydroxybutyrate) and the copolymer poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

Melt Spinning of Poly(3‐hydroxybutyrate) for Tissue Engineering Using Electron‐Beam‐Irradiated Poly(3‐hydroxybutyrate) as Nucleation Agent

“…It can be seen that electron‐beam irradiation of PHB causes a distinct drop in average molecular weight. This result is in agreement with a previous investigation 18. All SEC measurements were repeated 4 weeks and 8 weeks after electron‐beam irradiation.…”

UV-photodegradation of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHB-HHx)

“…This indicates that higher doses of UV radiation induce chain scission, resulting in crystal phases at lower temperatures. A similar result was observed when PHB was exposed to gamma [13][14][15] and to electric radiation. 16 Conversely, the crystallization temperature of PHB-HHx shifts to higher temperatures with increasing UV irradiation, which implies that UV radiation may retard the crystallization of PHB-HHx.…”

Semi-interpenetrating polymer networks of poly(3-hydroxybutyrate) prepared by radiation-induced polymerization

“…When the irradiated samples are concerned, it can be observed that there is a noticeable decrease of both T m and X c values of PHB phase with radiation to be mainly ascribed to the partial destruction of crystalline regions by chain scission (Mitomo et al, 1994).…”

“…It should be noted that Mitomo et al (1994) irradiated with g-rays at doses in the range of 50-3000 kGy both poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate). These authors observed a predominant degradation proceeding by chain scission in the lower dose range, while at doses around 1 MGy some crosslinking was also detectable.…”