Natural fibrous sepiolite-reinforced emulsion polymer isocyanate for timber structural adhesive

IF 2.9 4区材料科学 Q2 ENGINEERING, CHEMICAL

Journal of Adhesion Pub Date : 2023-03-02 DOI:10.1080/00218464.2023.2184263

Zenghao Zhou, Liang Fu, Yaolong He, Hongjiu Hu

{"title":"Natural fibrous sepiolite-reinforced emulsion polymer isocyanate for timber structural adhesive","authors":"Zenghao Zhou, Liang Fu, Yaolong He, Hongjiu Hu","doi":"10.1080/00218464.2023.2184263","DOIUrl":null,"url":null,"abstract":"ABSTRACT The natural fibrous sepiolite is introduced into emulsion polymer isocyanate (EPI) consisting of aqueous vinyl acetate copolymer-based main component (MC) and polymeric methylene diisocyanate (pMDI) for the first time to prepare a high-performance, environmentally friendly, and cost-effective timber adhesive. We have studied the effect of the sepiolite content on the tensile stress-strain curves, dynamical mechanical properties, essential work of fracture of the cured glue layer, and the EPI bonding properties. In addition, we have also investigated the chemical group, fractional free volume, and morphology of EPI polymers with various sepiolite contents. The results indicate that adding sepiolite can significantly increase the tensile strength, elastic modulus, dynamic stiffness, and fracture toughness of cured EPI films. Remarkably, EPI-bonded structures exhibit superior resistance to compressive shear damage upon ageing in boiling water. For MC with 6.0–9.0 wt% sepiolite, only the addition of 10.0 wt% general pMDI crosslinker is required to achieve the JIS K6806 structural adhesive. The underlying enhancement mechanism is the significant hydrogen-bonding coupled chemical reaction capability of sepiolite for the available groups in the EPI system.","PeriodicalId":14778,"journal":{"name":"Journal of Adhesion","volume":"99 1","pages":"2299 - 2323"},"PeriodicalIF":2.9000,"publicationDate":"2023-03-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Adhesion","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1080/00218464.2023.2184263","RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}

引用次数: 0

Abstract

ABSTRACT The natural fibrous sepiolite is introduced into emulsion polymer isocyanate (EPI) consisting of aqueous vinyl acetate copolymer-based main component (MC) and polymeric methylene diisocyanate (pMDI) for the first time to prepare a high-performance, environmentally friendly, and cost-effective timber adhesive. We have studied the effect of the sepiolite content on the tensile stress-strain curves, dynamical mechanical properties, essential work of fracture of the cured glue layer, and the EPI bonding properties. In addition, we have also investigated the chemical group, fractional free volume, and morphology of EPI polymers with various sepiolite contents. The results indicate that adding sepiolite can significantly increase the tensile strength, elastic modulus, dynamic stiffness, and fracture toughness of cured EPI films. Remarkably, EPI-bonded structures exhibit superior resistance to compressive shear damage upon ageing in boiling water. For MC with 6.0–9.0 wt% sepiolite, only the addition of 10.0 wt% general pMDI crosslinker is required to achieve the JIS K6806 structural adhesive. The underlying enhancement mechanism is the significant hydrogen-bonding coupled chemical reaction capability of sepiolite for the available groups in the EPI system.

查看原文本刊更多论文

天然纤维海泡石增强乳液聚合物异氰酸酯木结构胶粘剂

摘要首次将天然纤维海泡石引入到水基醋酸乙烯共聚物为主组分(MC)和聚亚甲基二异氰酸酯(pMDI)组成的乳液型聚合物异氰酸酯(EPI)中，制备了一种高性能、环保型、高性价比的木材胶粘剂。研究了海泡石含量对固化胶层的拉伸应力-应变曲线、动态力学性能、断裂功和EPI粘接性能的影响。此外，我们还研究了不同海泡石含量的EPI聚合物的化学基团、分数自由体积和形态。结果表明，海泡石的加入可显著提高EPI固化膜的拉伸强度、弹性模量、动刚度和断裂韧性。值得注意的是，epi键合结构在沸水老化过程中表现出优越的抗压缩剪切损伤能力。对于含有6.0-9.0 wt%海泡石的MC，只需添加10.0 wt%一般pMDI交联剂即可达到JIS K6806结构胶。潜在的增强机制是海泡石对EPI体系中可用基团具有显著的氢键耦合化学反应能力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Adhesion 工程技术-材料科学：综合

CiteScore

5.30

自引率

9.10%

发文量

审稿时长

1 months

期刊介绍： The Journal of Adhesion is dedicated to perpetuating understanding of the phenomenon of adhesion and its practical applications. The art of adhesion is maturing into a science that requires a broad, coordinated interdisciplinary effort to help illuminate its complex nature and numerous manifestations.