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中国塑料 ›› 2021, Vol. 35 ›› Issue (8): 117-124.DOI: 10.19491/j.issn.1001-9278.2021.08.017
收稿日期:
2021-07-11
出版日期:
2021-08-26
发布日期:
2021-08-27
TANG Yujing, WANG Yaqiao, NI Jingyue, WANG Conglong, WANG Xiangdong()
Received:
2021-07-11
Online:
2021-08-26
Published:
2021-08-27
Contact:
WANG Xiangdong
E-mail:wangxid@th.btbu.edu.cn
摘要:
通过熔融共混法,将右旋聚乳(PDLA)引入到扩链聚乳酸(PLLA)体系中,研究了不同含量PDLA诱导形成的立构复合晶(Sc晶)对共混体系的流变行为和发泡行为的影响。在此基础上,引入聚四氟乙烯(PTFE),研究其对Sc晶形成的影响,以及引入PTFE后共混体系的流变行为和发泡行为。结果表明,PTFE含量为0.5 %时显著提高了Sc晶的含量;Sc晶的形成提高了熔体强度,促进了泡孔成核,有效改善了PLLA的发泡性能,形成了微纳复合泡孔。
中图分类号:
唐于婧, 王亚桥, 倪敬越, 王从龙, 王向东. 立构复合晶对聚乳酸发泡行为的影响[J]. 中国塑料, 2021, 35(8): 117-124.
TANG Yujing, WANG Yaqiao, NI Jingyue, WANG Conglong, WANG Xiangdong. Effect of Stereoscopic Composite Crystals on Foaming Behavior of PLA[J]. China Plastics, 2021, 35(8): 117-124.
样品编号 | PLLA/份 | PDLA/份 | CE/份 | PTFE/份 |
---|---|---|---|---|
CE5/PLLA/PDLA15/PTFE0.25 | 85 | 15 | 5 | 0.25 |
CE5/PLLA/PDLA15/PTFE0.5 | 85 | 10 | 5 | 0.50 |
CE5/PLLA/PDLA15/PTFE0.75 | 85 | 15 | 5 | 0.75 |
CE5/PLLA/PDLA15/PTFE1 | 85 | 15 | 5 | 1.00 |
样品编号 | PLLA/份 | PDLA/份 | CE/份 | PTFE/份 |
---|---|---|---|---|
CE5/PLLA/PDLA15/PTFE0.25 | 85 | 15 | 5 | 0.25 |
CE5/PLLA/PDLA15/PTFE0.5 | 85 | 10 | 5 | 0.50 |
CE5/PLLA/PDLA15/PTFE0.75 | 85 | 15 | 5 | 0.75 |
CE5/PLLA/PDLA15/PTFE1 | 85 | 15 | 5 | 1.00 |
样品 | Sc晶熔融 温度/℃ | 熔融焓/ J?g-1 | Sc结晶度/ % |
---|---|---|---|
PLLA/CE5 | - | - | 0 |
PLLA/CE5/PDLA5 | 214.72 | 5.71 | 6.4 |
PLLA/CE5/PDLA10 | 213.63 | 15.25 | 18.1 |
PLLA/CE5/PDLA15 | 222.89 | 19.13 | 24.0 |
PLLA/CE5/PDLA20 | 225.19 | 25.89 | 34.5 |
样品 | Sc晶熔融 温度/℃ | 熔融焓/ J?g-1 | Sc结晶度/ % |
---|---|---|---|
PLLA/CE5 | - | - | 0 |
PLLA/CE5/PDLA5 | 214.72 | 5.71 | 6.4 |
PLLA/CE5/PDLA10 | 213.63 | 15.25 | 18.1 |
PLLA/CE5/PDLA15 | 222.89 | 19.13 | 24.0 |
PLLA/CE5/PDLA20 | 225.19 | 25.89 | 34.5 |
PDLA含量/ % | 小泡孔密度/ ×1013个?cm-3 | 大泡孔尺寸/ μm | 小泡孔尺寸/ nm | 发泡 倍率 |
---|---|---|---|---|
0 | - | 105.8 | - | 4.5 |
5 | 21.7 | 23.04 | 84.5 | 2.7 |
10 | 6.56 | 22.8 | 58.9 | 1.66 |
15 | 21.9 | 19.6 | 67.8 | 2.03 |
20 | 6.71 | - | 83.7 | 1.4 |
PDLA含量/ % | 小泡孔密度/ ×1013个?cm-3 | 大泡孔尺寸/ μm | 小泡孔尺寸/ nm | 发泡 倍率 |
---|---|---|---|---|
0 | - | 105.8 | - | 4.5 |
5 | 21.7 | 23.04 | 84.5 | 2.7 |
10 | 6.56 | 22.8 | 58.9 | 1.66 |
15 | 21.9 | 19.6 | 67.8 | 2.03 |
20 | 6.71 | - | 83.7 | 1.4 |
样品 | 熔融 温度/℃ | 熔融焓/ J?g-1 | Sc结 晶度/% |
---|---|---|---|
PLLA/CE5/PDLA15 | 216.69 | 18.08 | 22.7 |
PLLA/CE5/PDLA15/PTFE0.25 | 222.04 | 22.64 | 28.5 |
PLLA/CE5/PDLA10/PTFE0.5 | 223.12 | 23.45 | 29.5 |
PLLA/CE5/PDLA15/PTFE0.75 | 223.28 | 22.12 | 27.8 |
PLLA/CE5/PDLA20/PTFE1 | 223.73 | 20.62 | 25.99 |
样品 | 熔融 温度/℃ | 熔融焓/ J?g-1 | Sc结 晶度/% |
---|---|---|---|
PLLA/CE5/PDLA15 | 216.69 | 18.08 | 22.7 |
PLLA/CE5/PDLA15/PTFE0.25 | 222.04 | 22.64 | 28.5 |
PLLA/CE5/PDLA10/PTFE0.5 | 223.12 | 23.45 | 29.5 |
PLLA/CE5/PDLA15/PTFE0.75 | 223.28 | 22.12 | 27.8 |
PLLA/CE5/PDLA20/PTFE1 | 223.73 | 20.62 | 25.99 |
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