过氧化物引发交联聚ε-己内酯的研究

以过氧化苯甲酰(BPO)为引发剂,对聚ε-己内酯(PCL)进行交联,研究了过氧化物含量,交联温度和交联时间对交联反应的影响,较高的交联温度可以提高BPO引发交联反应的速率.采用DSC、WAXD和DMA等方法对交联后聚ε-己内酯的结晶行为、玻璃化转变、力学性能及其生物降解特性进行了研究.结果表明,交联PCL的结晶度下降,熔点降低,玻璃化转变温度降低,但结晶温度有所提高.交联PCL的断裂伸长率和杨氏模量均下降.但是仍具有完全的生物降解能力.

CROSSLINKED POLY (ε-CAPROLACTONE) INITIATED BY BENZOYL PEROXIDE

(Poly(ε-caprolactone))(PCL) was chemically crosslinked with various amounts of benzoyl peroxide(BPO).The effect of BPO contents,crosslinking temperature and time on the crosslinking reaction was studied.The thermal,mechanical,and biodegradable properties of crosslinked PCL were also examined by DSC and DMA etc.The results showed that the melting temperature,crystallinity and glass transition temperature decreased with increase in BPO contents,while the crystallization temperature increased with increase in BPO content.The Young's modulus and elongation at break generally decreased with increase in BPO content.Moreover,the crosslinked PCL still had biodegradable ability.