文章信息/Info

Title:

Self-Healing Supramolecular Polyurethane Elastomers Based on Multiple Hydrogen Bonds

文章編號:

1674-3962(2024)02-0136-06

作者:

何宇飛; 游正偉

東華大學材料科學與工程學院 纖維材料改性國家重點實驗室 中國紡織工程學會柔性電子生物醫用紡織材料科研基地 上海納米生物材料與再生醫學工程技術研究中心，上海 201600

Author(s):

He Yufei; You Zhengwei

Shanghai Engineering Research Center of Nano-Biomaterials and Regenerative Medicine, Research Base of Textile Materials for Flexible Electronics and Biomedical Applications of China Textile Engineering Society,State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201600, China

關鍵詞:

多重氫鍵; 聚氨酯; 自修復; 超分子; 彈性體

Keywords:

multiple hydrogen bond; polyurethane; self-healing; supramolecule elastomer;  elastomer

分類號:

TQ334.9

DOI:

10.7502/j.issn.1674-3962.202112023

文獻標志碼:

A

摘要:

多重氫鍵是一類具有較高結合強度及動態可逆性質的超分子作用，在線型聚合物中可形成物理交聯網絡，提高材料機械強度的同時賦予材料良好的自修復能力。以聚四氫呋喃、六亞甲基二異氰酸酯、2,4-二氨基-6-羥基嘧啶為原料，合成了具有多重氫鍵物理交聯結構的聚氨酯。當聚四氫呋喃與擴鏈劑2,4-二氨基-6-羥基嘧啶的物質的量的比為7∶3及5∶5時，可得到兼具力學強度與自愈能力的超分子聚氨酯彈性體。利用核磁共振氫譜、紅外光譜、凝膠滲透色譜、差示掃描量熱分析、流變測試表征了彈性體的結構和基本性質。通過對2組彈性體力學性能及自愈性能的比較發現，不同的組成比例改變了多重氫鍵形成的物理交聯強度及分子鏈的運動能力，聚四氫呋喃與擴鏈劑物質的量的比為7∶3時，材料具有較高的斷裂伸長率（1280%）；物質的量的比為5∶5時，材料在循環拉伸中具有更好的形變回復能力，應力松弛更慢；兩組彈性體在60 ℃環境下均表現出一定的自修復能力。

Abstract:

Multiple hydrogen bonds are a kind of supramolecular interactions with high bonding strength and dynamic reversibility, which can form physical cross�瞝inking networks in linear polymers to improve the mechanical strength of materials and endow them with good self�瞙ealing ability. Polyurethane with multiple hydrogen bond physical crosslinking structure was synthesized from polytetrahydrofuran, hexamethylene diisocyanate and 2,4-diamino-6�瞙ydroxypyrimidine. When the molar ratios of polytetrahydrofuran and chain extender 2,4-diamino-6-hydroxypyrimidine were 7∶3 and 5∶5, supramolecular polyurethane elastomers with mechanical strength and self-healing ability were obtained. The chemical structure and basic properties were characterized by 1H-NMR, IR, gel permeation chromatography, differential scanning calorimetry and rheological test. Comparison of the mechanical and self-healing properties of two groups of elastomers revealed that the different composition altered the physical crosslinking density of multiple hydrogen bonds and the mobility of the molecular chain. When the mole ratio of polytetrahydrofuran and chain extender was 7∶3, material had higher elongation at break (1280%); when the molar ratio was 5∶5, the material had better deformation recovery ability during cyclic stretching, and the stress relaxation was slower; both groups of elastomers showed definite self�瞙ealing ability at 60 ℃.