环氧基扩链剂对3-羟基丁酸和4-羟基丁酸共聚物的改性研究

Modification of poly(3-hydroxybutyrate-co-4-hydroxybutyrate)by epoxy-based chain extenders

将ADR系列的扩链剂用于3-羟基丁酸和4-羟基丁酸共聚物(P(3HB-co-4HB))纺丝成型,分析了ADR的扩链机制,考察了P(3HB-co-4HB)和P(3HB-co-4HB)/ADR共混体系的流动性、热稳定性、结晶性和纤维的力学性能。结果表明,以ADR作为扩链剂可有效提高熔体强度,改善纤维的热稳定性,在温度为155℃,ADR的添加量为0.5%时,熔体具有最大的剪切强度、拉伸强度和最佳的耐热性。ADR对P(3HB-co-4HB)的结晶结构影响不大,但会导致结晶速度降低和最大结晶温度提高,加入ADR后P(3HB-co-4HB)纤维的力学性能有明显改善。

ADR series chain extenders were used for spinning poly（3-hydroxybutyrate-co- 4- hydroxybutyrate） （P（3HB-co-4HB））. The rheology, thermal stability, crystallinity and fiber mechanical properties of P （3 HB-co-4HB） and P （3HB-co-4HB）/ADR blends were investigated, along with the chain extendsion mechasim of ADR. The results showed that ADR can increase the melt strength, and improve the thermal stability of the fibers; and when the addition amount of ADR is 0.5% at 155 ℃, the melt has the maximum shearing strength and tensile strength, as well as optimum heat resistance. The influence of ADR on the crystal structure of P （3HB-co-4HB） is not remarkable, but it leads to the reduction of the crystallization rate and the increase of the maximum crystallization temperature. The mechanical properties of P （3HB-co-4HB） fibers are significantly improved with ADR added.