High-Strength Bio-Degradable Polymer Foams with Stable High Volume-Expansion Ratio Using Chain Extension and Green Supercritical Mixed-Gas Foaming

被引：22

作者：

Long, Haoyu ^{[1
]}

Xu, Hongsen ^{[1
]}

Shaoyu, Jingwen ^{[1
]}

Jiang, Tianchen ^{[1
]}

Zhuang, Wei ^{[1
,2
,3
,4
]}

Li, Ming ^{[1
,2
,3
]}

Jin, Junyang ^{[1
]}

Ji, Lei ^{[1
,2
,3
,4
]}

Ying, Hanjie ^{[1
,2
,3
,4
]}

Zhu, Chenjie ^{[1
,2
,3
,4
]}

机构：

[1] Nanjing Tech Univ, Coll Biotech & Pharmaceut Engn, 30 Puzhu South Rd, Nanjing 211816, Peoples R China

[2] Nanjing Tech Univ, Natl Engn Tech Res Ctr Biotech, 30 Puzhu South Rd, Nanjing 211816, Peoples R China

[3] Nanjing Tech Univ, State Key Lab Mat Oriented Chem Engn, 5 Xinmofan Rd, Nanjing 210009, Peoples R China

[4] Nanjing Tech Univ, Synerget Innovat Ctr Adv Mat, 30 Puzhu South Rd, Nanjing 211816, Peoples R China

来源：

POLYMERS | 2023年 / 15卷 / 04期

基金：

中国国家自然科学基金;

关键词：

supercritical foaming; chain extension; poly (butylene adipate-co-terephthalate); polylactic acid; bead foaming; MECHANICAL-PROPERTIES; CRYSTALLIZATION; POLYLACTIDE; BEHAVIOR; BLENDS; ACID); PLA; CO2;

D O I：

10.3390/polym15040895

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The preparation of biodegradable polymer foams with a stable high volume-expansion ratio (VER) is challenging. For example, poly (butylene adipate-co-terephthalate) (PBAT) foams have a low melt strength and high shrinkage. In this study, polylactic acid (PLA), which has a high VER and crystallinity, was added to PBAT to reduce shrinkage during the supercritical molded-bead foaming process. The epoxy chain extender ADR4368 was used both as a chain extender and a compatibilizer to mitigate the linear chain structure and incompatibility and improve the foamability of PBAT. The branched-chain structure increased the energy-storage modulus (G') and complex viscosity (eta*), which are the key factors for the growth of cells, by 1-2 orders of magnitude. Subsequently, we innovatively used the CO2 and N-2 composite gas method. The foam-shrinkage performance was further inhibited; the final foam had a VER of 23.39 and a stable cell was obtained. Finally, after steam forming, the results showed that the mechanical strength of the PBAT/PLA blended composite foam was considerably improved by the addition of PLA. The compressive strength (50%), bending strength, and fracture load by bending reached 270.23 kPa, 0.36 MPa, and 23.32 N, respectively. This study provides a potential strategy for the development of PBAT-based foam packaging materials with stable cell structure, high VER, and excellent mechanical strength.

引用

页数：21