Effect of chain extender and light stabilizer on the weathering resistance of PBAT/PLA blend films prepared by extrusion blowing
Effect of chain extender and light stabilizer on the weathering resistance of PBAT/PLA blend films prepared by extrusion blowing
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DOI：
10.1016/j.polymdegradstab.2020.109455
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发表时间：
2021
影响因子：
5.9
通讯作者：
Tingting Zhang;Weiyao Han;Caili Zhang;Yunxuan Weng
中科院分区：
文献类型：
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作者：
Tingting Zhang;Weiyao Han;Caili Zhang;Yunxuan Weng
在一种扩链剂和两种不同的光稳定剂存在下，采用熔融共混和吹塑技术制备了可生物降解的聚(己二酸丁二醇酯-对苯二甲酸丁二醇酯)/聚乳酸(PBAT/PLA)薄膜。老化前后红外光谱对比表明，扩链剂和光稳定剂的加入显著提高了聚合物的耐候性。在没有聚乳酸的情况下，PBAT在风化过程中发生了严重的断链和交联。随着聚乳酸含量的增加，PBAT/聚乳酸的膜链断裂减弱。老化200h后，PBAT和PBAT/PLA膜的机械向拉伸强度、机械方向拉伸强度和横向断裂伸长率均有所下降，而横向拉伸强度变化不大。当扩链剂用量为1.5份时，当PBAT：PLA的比例为85：15时，在不改变拉伸强度的情况下，薄膜表现出更好的柔韧性。加入0.6份光稳定剂(Chimassorb2020或Irganox 1010)可显著提高共混物的耐候性。加入Chimassorb2020后，可以观察到更好的耐候性改善。PBAT/PLA/ADR/Chimassorb2020经200小时老化后，横向和横向拉伸强度分别下降了8.4%和28%。
Biodegradable poly (butylene adipate‑co‑terephthalate)/polylactic acid (PBAT/PLA) films were prepared by melt blending and blowing technology under the presence of a chain extender and two different light stabilizers. A comparison of the infrared spectra of the film with and without these additives before and after the weathering tests showed that the addition of chain extender and light stabilizer improved the polymer weathering resistance significantly. Without PLA, PBAT underwent serious chain scissions and crosslinking during the weathering. PBAT/PLA film chain scissions were weakened as the PLA content increased. After 200 h of the weathering, the machine direction (MD) tensile strength as well as MD and transverse direction (TD) elongation at break of both PBAT and PBAT/PLA films decreased, while their TD tensile strength changed only slightly. The film with the 85:15 PBAT:PLA ratio containing 1.5 phr of chain extender showed much better flexibility without any changes to its tensile strength. The addition of 0.6 phr of light stabilizer (Chimassorb2020 or Irganox 1010) to this blend showed significantly improved weathering resistance. Better weathering improvement was observed when Chimassorb2020 was added. The tensile strength of PBAT/PLA/ADR/ Chimassorb2020 sample in the machine and transverse directions decreased by 8.4 and 28%, respectively, after 200 h of weathering.