聚乳酸微纳复合泡孔的结构与性能研究

doi:10.19491/j.issn.1001-9278.2020.04.004

中国塑料 ›› 2020, Vol. 34 ›› Issue (4): 20-24.DOI: 10.19491/j.issn.1001-9278.2020.04.004

聚乳酸微纳复合泡孔的结构与性能研究

倪敬越¹, 余科松², 唐娅娥³, 陈士宏¹, 王向东¹()

^1.北京工商大学材料与机械工程学院，北京 100048
^2.郑州大学，郑州 450001
^3.中国塑料加工工业协会，北京 100021

收稿日期:2020-01-06 出版日期:2020-04-26 发布日期:2020-04-26

Study on Structure and Properties of Toughened Poly(lactic acid) with Micro⁃Nano Complex Cells

Jingyue NI¹, Kesong YU², Yae TANG³, Shihong CHEN¹, Xiangdong WANG¹()

^1.School of Materials and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China
^2.Zhengzhou University, Zhengzhou 450001, China
^3.China Plastics Processing Industry Association, Beijing 100021, China

Received:2020-01-06 Online:2020-04-26 Published:2020-04-26
Contact: Xiangdong WANG E-mail:wxd@plaschina.com.cn

摘要/Abstract

摘要：

通过熔融共混制备聚乳酸（PLA）/聚（己二酸丁二酯?对苯二甲酸丁二酯）（PBAT）共混物。以环氧扩链剂（CE）为相容剂，研究了CE含量对共混物的流变行为、结晶行为的影响，并研究了CE含量为5份的共混物在冷结晶温度下的发泡行为以及泡沫的拉伸性能。结果表明，共混体系的相容性、结晶速率随着CE含量的增加而增加、可发性提高，在添加了5份CE的共混物中得到了微纳复合泡孔，泡孔密度达到10¹³个/cm³，相对于PLA泡沫，共混物泡沫的断裂伸长率提高了40 %。

关键词: 聚乳酸, 聚（己二酸丁二酯?对苯二甲酸丁二酯）, 冷结晶, 微纳复合泡孔

Abstract:

The polylactic acid (PLA)/poly (butylene adipate?butylene terephthalate) (PBAT) blends were prepared by melt blending. The effect of the content of epoxy chain extender (CE) as a compatibilizer on the rheological behavior and crystallization behavior of the blends was investigated, and the foaming behavior of the blend containing 5 phr CE under the cold crystallization condition and the tensile properties of the resulting foams were studied. The results indicated that the blending system presented an increase in compatibility and crystallization rate with an increase of CE content, and its expandability was improved. The micro?nano complex cells were obtained for the blend foam with 5 phr of CE. This blend foam achieved a cell density of 10¹³ cells/cm³ as like as the PLA foam, and its elongation at break increased by 40%.

Key words: polylactic acid, poly (butylene adipate?butylene terephthalate), cold crystallization, micro?nano complex cell

中图分类号:

TQ 321

倪敬越, 余科松, 唐娅娥, 陈士宏, 王向东. 聚乳酸微纳复合泡孔的结构与性能研究[J]. 中国塑料, 2020, 34(4): 20-24.

Jingyue NI, Kesong YU, Yae TANG, Shihong CHEN, Xiangdong WANG. Study on Structure and Properties of Toughened Poly(lactic acid) with Micro⁃Nano Complex Cells[J]. China Plastics, 2020, 34(4): 20-24.

图/表 9

样品	PLA/份	PBAT/份	CE/份
1^#	100	0	0
2^#	80	20	0
3^#	80	20	1
4^#	80	20	3
5^#	80	20	5
6^#	80	20	7

表1 配方表

Tab.1 Formula

图1 PLA及其共混体系的动态流变曲线

Fig.1 Dynamic rheological curves of PLA and its blending system

图2 样品的DSC测试曲线

Fig.2 DSC curves of the samples

样品	结晶度/%	熔融温度/℃
1^#	19.44±0.5	143.0/151.1±0.8
2^#	20.23±0.5	143.5/151.0±0.8
3^#	17.71±0.4	143.3/150.5±0.8
4^#	18.70±0.5	143.1/149.0±0.8
5^#	17.30±0.4	143.5/148.1±0.8
6^#	16.46±0.4	144.2/148.1±0.8

表2 PLA及其共混物的结晶度和熔融温度统计表

Tab. 2 Crystallinity and melting temperature of PLA and its alloys

图3 样品的POM照片

Fig.3 POM photos of the samples

图4 共混物分散相的SEM照片

Fig.4 SEM photographs of the dispersed phase of the blends

图5 泡孔的SEM照片

Fig.5 SEM photos of cells

温度/℃	泡孔尺寸/μm	泡孔密度/×10¹²个×cm^?3	发泡倍率
92	0.27±0.02	7.0±0.014	2.4±0.02
95	0.28±0.02	8.8±0.017	3.3±0.03
98	0.32±0.02	10.2±0.02	3.76±0.03
100	1.3±0.04	0.24±0.004	3.97±0.04

表3 泡孔数据统计表

Tab.3 Statistics of cell data

图6 应力?应变曲线

Fig.6 Stress?strain curves

参考文献 12

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聚乳酸微纳复合泡孔的结构与性能研究

Study on Structure and Properties of Toughened Poly(lactic acid) with Micro⁃Nano Complex Cells

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