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随着环境污染的加剧以及不可再生石油资源的逐渐枯竭,生物基高分子材料受到了越来越多的关注.聚乳酸作为一种可再生的高分子材料,由于具有良好的生物降解性、生物相容性和机械强度,在众多领域都具有巨大应用潜力.然而聚乳酸也存在一些缺陷限制着它的应用领域,如冲击韧性差、耐热形变温度低等.基于此,我们利用动态硫化技术,将左旋聚乳酸(PLLA),右旋聚乳酸(PDLA)以及不饱和生物基弹性体(UBE)通过自由基引发动态硫化成功制备了冲击韧性优于高抗冲聚苯乙烯、耐热性突出的全生物基PLLA/VUB/PDLA三元共混物,在不降低生物质含量、不影响其降解性能的情况下,实现了PLLA的高性能化.
With the aggravation of environmental pollution and the gradual depletion of non-renewable petroleum resources, bio-based polymer materials have drawn more and more attention.As a kind of renewable polymer materials, polylactic acid has good biodegradability, Compatibility and mechanical strength, has great potential in many fields.However, polylactic acid has some shortcomings that limit its applications, such as poor impact toughness, low heat distortion temperature, etc. Based on this, we use the dynamic vulcanization technology , PLLA, PDLA and UBE were successfully prepared by radical-initiated dynamic vulcanization. The impact toughness was better than that of high impact polystyrene, and the heat resistance was prominent PLLA / VUB / PDLA ternary blends, PLLA can be achieved without degrading the biomass content and without affecting its degradation performance.