Identifying the location and micellization of PEG-b-PCL multiblock copolymers in PLA/PCL blends via AFM nanoscale IR spectroscopy

IF 5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Polymer Testing Pub Date : 2024-08-14 DOI:10.1016/j.polymertesting.2024.108549

Lucas H. Staffa , Sílvia H.P. Bettini , Marcelo A. Chinelatto

{"title":"Identifying the location and micellization of PEG-b-PCL multiblock copolymers in PLA/PCL blends via AFM nanoscale IR spectroscopy","authors":"Lucas H. Staffa , Sílvia H.P. Bettini , Marcelo A. Chinelatto","doi":"10.1016/j.polymertesting.2024.108549","DOIUrl":null,"url":null,"abstract":"<div><p>The IR absorption mapping of two multiblock copolymers based on poly(ethylene glycol) and poly(ε-caprolactone) segments (PEG-<em>b</em>-PCL) in poly(acid lactic) and poly(ε-caprolactone) blends (PLA/PCL) was performed via AFM nanoscale IR spectroscopy. These copolymers, having the same number average molar masses (<span><math><mrow><mover><msub><mi>M</mi><mi>n</mi></msub><mo>‾</mo></mover></mrow></math></span>) but varying block sizes, were added into the blend in different amounts (1 and 5 wt%) using a co-rotating twin-screw extrusion. The results revealed that copolymers with smaller blocks are preferentially located near the interface when incorporated in small quantities. Increasing the copolymer content led to preferential diffusion into the PLA matrix. Compatibilization with the longer block-size copolymers also led to preferential diffusion in the PLA matrix, albeit with a tendency to form micelles. This hampers the overall mechanical properties of the blend, making the compatibilized blend more brittle than neat PLA. Compatibilization with the short block-size copolymers showed no micellization and improved the mechanical behavior of PLA/PCL.</p></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"138 ","pages":"Article 108549"},"PeriodicalIF":5.0000,"publicationDate":"2024-08-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0142941824002265/pdfft?md5=bcdf9311a64e38a113bab6d61a0561b5&pid=1-s2.0-S0142941824002265-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Polymer Testing","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0142941824002265","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, CHARACTERIZATION & TESTING","Score":null,"Total":0}

引用次数: 0

Abstract

The IR absorption mapping of two multiblock copolymers based on poly(ethylene glycol) and poly(ε-caprolactone) segments (PEG-b-PCL) in poly(acid lactic) and poly(ε-caprolactone) blends (PLA/PCL) was performed via AFM nanoscale IR spectroscopy. These copolymers, having the same number average molar masses ( $\overline{M_{n}}$ ) but varying block sizes, were added into the blend in different amounts (1 and 5 wt%) using a co-rotating twin-screw extrusion. The results revealed that copolymers with smaller blocks are preferentially located near the interface when incorporated in small quantities. Increasing the copolymer content led to preferential diffusion into the PLA matrix. Compatibilization with the longer block-size copolymers also led to preferential diffusion in the PLA matrix, albeit with a tendency to form micelles. This hampers the overall mechanical properties of the blend, making the compatibilized blend more brittle than neat PLA. Compatibilization with the short block-size copolymers showed no micellization and improved the mechanical behavior of PLA/PCL.

Abstract Image

查看原文本刊更多论文

通过原子力显微镜纳米级红外光谱鉴定聚乳酸/聚CL 混合物中 PEG-b-PCL 多嵌段共聚物的位置和胶束化情况

通过原子力显微镜（AFM）纳米级红外光谱，对聚乳酸和聚（ε-己内酯）共混物（PLA/PCL）中两种基于聚乙二醇和聚（ε-己内酯）段的多嵌段共聚物（PEG-b-PCL）进行了红外吸收图谱分析。这些共聚物具有相同的平均摩尔质量（Mn‾），但嵌段尺寸各不相同，使用同向旋转双螺杆挤出机以不同的添加量（1 和 5 wt%）加入共混物中。结果表明，当加入少量共聚物时，嵌段较小的共聚物优先位于界面附近。增加共聚物的含量会使其优先扩散到聚乳酸基质中。与较长嵌段尺寸的共聚物相容也会导致优先扩散到聚乳酸基质中，尽管有形成胶束的趋势。这影响了混合物的整体机械性能，使相容混合物比纯聚乳酸更脆。与短块状共聚物相容则不会出现胶束化，并改善了聚乳酸/PCL 的机械性能。

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

Polymer Testing 工程技术-材料科学：表征与测试

CiteScore

10.70

自引率

5.90%

发文量

328

审稿时长

44 days

期刊介绍： Polymer Testing focuses on the testing, analysis and characterization of polymer materials, including both synthetic and natural or biobased polymers. Novel testing methods and the testing of novel polymeric materials in bulk, solution and dispersion is covered. In addition, we welcome the submission of the testing of polymeric materials for a wide range of applications and industrial products as well as nanoscale characterization. The scope includes but is not limited to the following main topics: Novel testing methods and Chemical analysis • mechanical, thermal, electrical, chemical, imaging, spectroscopy, scattering and rheology Physical properties and behaviour of novel polymer systems • nanoscale properties, morphology, transport properties Degradation and recycling of polymeric materials when combined with novel testing or characterization methods • degradation, biodegradation, ageing and fire retardancy Modelling and Simulation work will be only considered when it is linked to new or previously published experimental results.