Polymer Testing最新文献_第4页

Char, gas, and action: Transfer of the flame-retardant modes of action in epoxy resins and their fiber-reinforced composites 炭、气体和作用：环氧树脂及其纤维增强复合材料阻燃作用模式的转移

IF 5 2区材料科学

Polymer Testing Pub Date : 2024-10-15 DOI: 10.1016/j.polymertesting.2024.108610

Maria Jauregui Rozo , Sruthi Sunder , Holger Ruckdäschel , Bernhard Schartel

{"title":"Char, gas, and action: Transfer of the flame-retardant modes of action in epoxy resins and their fiber-reinforced composites","authors":"Maria Jauregui Rozo , Sruthi Sunder , Holger Ruckdäschel , Bernhard Schartel","doi":"10.1016/j.polymertesting.2024.108610","DOIUrl":"10.1016/j.polymertesting.2024.108610","url":null,"abstract":"<div><div>Flame retardants are often developed for epoxy resins and then transferred into their fiber-reinforced composites with uncertain results. Understanding this transfer in detail represents a critical scientific challenge. This study systematically compares epoxy resins with their glass-fiber reinforced composites, focusing on bisphenol A diglycidyl ether with the hardener dicyandiamide, the flame retardants melamine polyphosphate, ammonium polyphosphate, and silane ammonium polyphosphate, along with inorganic silicate. The research investigates changes in pyrolysis (thermogravimetry), flammability (UL 94, limiting oxygen index), and fire behavior (cone calorimeter) while also examining the flame-retardant modes of action and overall fire performance. The findings reveal that alterations in the amount of fuel, thermal properties, melt flow, and protective layer significantly impact ignition, flammability, and fire load, with a critical reduction in carbonaceous char within the composites preventing intumescence. This study quantifies the effects and provides a fundamental scientific understanding of the complex transfer process of flame retardants from resins to composites, offering essential insights that are of major importance for developing more effective flame-retardant materials.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"140 ","pages":"Article 108610"},"PeriodicalIF":5.0,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effects of Loading Angles on the Failure of Cross-Ply Notched Bio-Basalt Composites 加载角度对交叉层缺口生物钴复合材料失效的影响

IF 5 2区材料科学

Polymer Testing Pub Date : 2024-10-11 DOI: 10.1016/j.polymertesting.2024.108609

Zoran Bergant, Roman Šturm, Tomaž Kek, Miroslav Halilovič, Andraž Maček

{"title":"The Effects of Loading Angles on the Failure of Cross-Ply Notched Bio-Basalt Composites","authors":"Zoran Bergant, Roman Šturm, Tomaž Kek, Miroslav Halilovič, Andraž Maček","doi":"10.1016/j.polymertesting.2024.108609","DOIUrl":"10.1016/j.polymertesting.2024.108609","url":null,"abstract":"<div><div>A cross-ply basalt V-notched butterfly specimens were subjected to pure tension, combined tension-shear, and shear stress-strain state using a modified Arcan test fixture with loading angles from 0° to 90° with 15° increment. Multiaxial stress and strain states were studied using the principal stress and strain ratio, from which the principal angle was determined and used to represent principal states in the gauge section. The quasi-elastic to non-linear transition stresses were determined for each loading angle. In biaxial stress-strain states and pure shear, the deformation and consequently the shear-induced damage start to accumulate significantly. Also, in biaxial stress-strain states between 15°-75°, the shift from tension-shear to pure shear was observed after the transition to the non-linear part of the stress-strain curve. The digital image correlation (DIC) images and microscopic evaluation show that a large extent of damage is the consequence of the shear deformation after the rotation of 0° clamped fibres, while the 90° fibres maintained their original straight form. In off-axis tests, the principal strain axis rotates towards the weakest material axis even at small off-axis angles. This causes a transition from a tension-shear biaxial state in the linear loading part to shear in the non-linear part, leading to irreversible damage beyond the transition point.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"140 ","pages":"Article 108609"},"PeriodicalIF":5.0,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultra-strength and anti-freezing zwitterionic hydrogels with high ion conductivity: Effect of the hydrophobic monomer in hydrogels mechanical properties 具有高离子传导性的超强度抗冻齐聚物水凝胶：疏水单体对水凝胶机械性能的影响

IF 5 2区材料科学

Polymer Testing Pub Date : 2024-10-10 DOI: 10.1016/j.polymertesting.2024.108607

Hatam Najafi Fath Dehghan , Amir Abdolmaleki , Mehdi Pourahmadi , Sepideh Hozori , Ehsan Gaeini , Seyed Younes Mousavi , Amir-Reza Arvaneh , Mehdi Sadat-Shojai

{"title":"Ultra-strength and anti-freezing zwitterionic hydrogels with high ion conductivity: Effect of the hydrophobic monomer in hydrogels mechanical properties","authors":"Hatam Najafi Fath Dehghan , Amir Abdolmaleki , Mehdi Pourahmadi , Sepideh Hozori , Ehsan Gaeini , Seyed Younes Mousavi , Amir-Reza Arvaneh , Mehdi Sadat-Shojai","doi":"10.1016/j.polymertesting.2024.108607","DOIUrl":"10.1016/j.polymertesting.2024.108607","url":null,"abstract":"<div><div>Zwitterionic hydrogels have emerged as a promising option due to their remarkable ionic conductivity. However, these hydrogels often suffer from poor mechanical properties due to their super hydrophilicity. Herein, we propose the use of a rigid aryl imidazolium monomer (AIm) for crosslinking with poly(vinyl alcohol) (PVA) to create a unique zwitterion hydrogel. Chlorosulfonic acid acts as an agent to introduce anionic groups, facilitating the transfer of Zn<sup>2</sup>⁺ ions in zwitterionic hydrogel. We achieve extraordinary mechanical properties by incorporating an optimal amount of AIm into the PZW2 hydrogel (tensile stress 0.9 MPa and stretch 1400 %). Above all, the PZW2 hydrogel exhibits remarkable resistance to freezing, remaining unfrozen even at up to −80 °C. This anti-freezing property is attributed to the cation-dipole interactions and the presence of ZnCl<sub>2</sub>, effectively preventing water from freezing within the hydrogel structure. Furthermore, the PZW2 hydrogel demonstrates a high ionic conductivity of 4.34 S m<sup>−1</sup> at room temperature. This can be attributed to the presence of anionic and cationic charges within the PZW2 hydrogel, which facilitates the transfer of ions through a hopping mechanism. The PZW2 hydrogel demonstrates better performance compared to most antifreeze conductive hydrogels. At −20 °C, it achieves an impressive ionic conductivity of 2.73 S m<sup>−1</sup> and retains outstanding mechanical characteristics with a stretchability of 1000 %. Ultimately, the PZW2 hydrogel demonstrates a sensitive response performance with a gauge factor of 1.59, making it highly suitable for potential sensor applications.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"140 ","pages":"Article 108607"},"PeriodicalIF":5.0,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rheological analysis of network structure of raw natural rubber prepared by different processing techniques 不同加工技术制备的天然生橡胶网络结构的流变学分析

IF 5 2区材料科学

Polymer Testing Pub Date : 2024-10-10 DOI: 10.1016/j.polymertesting.2024.108608

Rui Wang , Lusheng Liao , Pengfei Zhao , Heping Yu , Fuquan Zhang , Gaorong Li , Zheng Peng

{"title":"Rheological analysis of network structure of raw natural rubber prepared by different processing techniques","authors":"Rui Wang , Lusheng Liao , Pengfei Zhao , Heping Yu , Fuquan Zhang , Gaorong Li , Zheng Peng","doi":"10.1016/j.polymertesting.2024.108608","DOIUrl":"10.1016/j.polymertesting.2024.108608","url":null,"abstract":"<div><div>The performance of raw natural rubber (NR) is dominated by its network structure, particular the levels of long chain branching (LCB) and entanglement. Here, three type of raw rubbers were prepared using different processing methods for commercial grade NRs. Linear and nonlinear viscoelastic behaviors, as well as stress relaxation, were analyzed to access their network structures. The third relative harmonic, phase angle, and first to second quarter-period integral ratio of stress curve were utilized as indicators for the nonlinearity of samples. By combining these values with flow activation energy and characteristic times, it can be confirmed that naturally coagulated NR showed higher elasticity than acid-coagulated NR due to high levels of LCB and entanglement, and hot air drying could lead to chain degradation. These findings correlated with molecular weight parameters, gel content and Mooney viscosity results. This research establishes a method for monitoring raw NR quality and predicting its properties.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"140 ","pages":"Article 108608"},"PeriodicalIF":5.0,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Flexible and innovative PVA/ZrO2/g-C3N4/CNT nanocomposites film for optoelectronic applications 用于光电应用的柔性创新 PVA/ZrO2/g-C3N4/CNT 纳米复合薄膜

IF 5 2区材料科学

Polymer Testing Pub Date : 2024-10-05 DOI: 10.1016/j.polymertesting.2024.108604

Majed Alshammari

{"title":"Flexible and innovative PVA/ZrO2/g-C3N4/CNT nanocomposites film for optoelectronic applications","authors":"Majed Alshammari","doi":"10.1016/j.polymertesting.2024.108604","DOIUrl":"10.1016/j.polymertesting.2024.108604","url":null,"abstract":"<div><div>This study successfully prepared polyvinyl alcohol (PVA) polymer films doped with ZrO<sub>2</sub>/(g-C<sub>3</sub>N<sub>4</sub>/CNT) nanofillers using the solution casting technique. The crystal structure of the nanocomposite films was characterized by X-ray diffraction (XRD), revealing the semi-crystalline nature of PVA and an average ZrO<sub>2</sub> crystallite size of 13.17 nm. Fourier-transform infrared (FTIR) spectroscopy confirmed the chemical composition and functional groups present in the nanocomposites. Scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) analysis showed uniform dispersion of the nanofillers without noticeable phase separation, with EDX confirming the successful incorporation of ZrO<sub>2</sub>, g-C<sub>3</sub>N<sub>4</sub>, and CNT into the PVA matrix. X-ray photoelectron spectroscopy (XPS) further validated the elemental composition and chemical states, indicating the presence of carbon, oxygen, nitrogen, and zirconium. Optical analysis demonstrated that increasing ZrO<sub>2</sub>/(g-C<sub>3</sub>N<sub>4</sub>/CNT) content reduced the direct and indirect band gaps from 5.41 eV to 5.25 eV and from 5.18 eV to 4.92 eV, respectively. In addition, the single-oscillator energy (<em>E</em><sub><em>0</em></sub>) and dispersion energy (<em>E</em><sub><em>d</em></sub>) increased, while the static refractive index (n<sub>0</sub>) decreased. Improvements were also observed in linear optical susceptibility (χ<sup>(1)</sup>) and third-order nonlinear optical susceptibility (χ<sup>(3)</sup>), enhancing the polarizability of the polymer molecules. These results indicate that PVA films doped with ZrO<sub>2</sub>/(g-C<sub>3</sub>N<sub>4</sub>/CNT) hold promise for optoelectronic applications due to their enhanced optical properties.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"140 ","pages":"Article 108604"},"PeriodicalIF":5.0,"publicationDate":"2024-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Characterization of the in-situ degradation process of P3HT:PCBM based on hyperspectral and neural networks 基于高光谱和神经网络的 P3HT:PCBM 原位降解过程表征

IF 5 2区材料科学

Polymer Testing Pub Date : 2024-10-04 DOI: 10.1016/j.polymertesting.2024.108606

Yang Wang , Zhao Ding , Junli Li , Ting Yang , Jianfeng Chen , Lifeng Bian , Chen Yang

{"title":"Characterization of the in-situ degradation process of P3HT:PCBM based on hyperspectral and neural networks","authors":"Yang Wang , Zhao Ding , Junli Li , Ting Yang , Jianfeng Chen , Lifeng Bian , Chen Yang","doi":"10.1016/j.polymertesting.2024.108606","DOIUrl":"10.1016/j.polymertesting.2024.108606","url":null,"abstract":"<div><div>In situ online observation of surface morphology during degradation processes is of paramount importance for exploring the stability of organic photovoltaic materials. In this study, we designed an in situ online characterization system based on hyperspectral and neural network technologies, and observed the degradation processes of P3HT:PCBM thin film materials. The system is capable of collecting hyperspectral image data from 101 channels within the 400–700 nm wavelength range for characterizing detailed surface features of materials. Additionally, to automate the processing of hyperspectral image data, we designed a spectral image segmentation algorithm based on neural networks and proposed a foreground attention mechanism to improve the segmentation accuracy of the algorithm. The experimental results indicate that the system can achieve high spectral characterization of P3HT:PCBM thin film materials and automate image data processing through artificial intelligence algorithms, with an image segmentation accuracy of 99.62 %. Furthermore, owing to the higher spectral resolution of this system and its computer-assisted analysis capabilities for material image data, not only are the in-situ variations in size, density, and formation rate of aggregates formed during the thermal degradation process of P3HT:PCBM thin film materials experimentally analyzed, but also the fluorescence changes at the edges of aggregates during the photodegradation process are revealed. The reliable code can be found at the following link: <span><span>https://github.com/HyperSystemAndImageProc/IONFMDP-UHHNN</span><svg><path></path></svg></span>.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"140 ","pages":"Article 108606"},"PeriodicalIF":5.0,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Recent advancements in bio-based plasticizers for polylactic acid (PLA): A review 用于聚乳酸（PLA）的生物基增塑剂的最新进展：综述

IF 5 2区材料科学

Polymer Testing Pub Date : 2024-10-04 DOI: 10.1016/j.polymertesting.2024.108603

Shiyan Sun, Yunxuan Weng, Caili Zhang

{"title":"Recent advancements in bio-based plasticizers for polylactic acid (PLA): A review","authors":"Shiyan Sun, Yunxuan Weng, Caili Zhang","doi":"10.1016/j.polymertesting.2024.108603","DOIUrl":"10.1016/j.polymertesting.2024.108603","url":null,"abstract":"<div><div>Research on bio-based plasticizers for polylactic acid (PLA), an environmentally friendly and biodegradable polyester, has advanced due to the increasing focus on sustainable materials. The brittleness of PLA has presented challenges in film production, prompting researchers to blend it with natural plasticizers such as vegetable oils and citrate to enhance flexibility and processing ease while maintaining biodegradability and safety. This review summarizes recent findings from the past five years on bio-based plasticizers for PLA, highlighting their impact on the physical properties of PLA. Despite the high cost associated with bio-based plasticizers, their market is anticipated to expand owing to the environmental benefits they provide. Primary challenges involve the advancement of bio-based plasticizers with superior performance, broadening the range of available feedstock choices, and performing economic evaluations to enhance competitiveness. In the future, research will focus on formulating plasticizers that offer added advantages such as enhanced toughness, antimicrobial features, and reduced migration, in line with the industry's growing emphasis on sustainability.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"140 ","pages":"Article 108603"},"PeriodicalIF":5.0,"publicationDate":"2024-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Raw rubber network of acid-free natural rubber and its application with solution-polymerized styrene butadiene rubber in green tires 无酸天然橡胶的生橡胶网络及其与溶液聚合丁苯橡胶在绿色轮胎中的应用

IF 5 2区材料科学

Polymer Testing Pub Date : 2024-10-02 DOI: 10.1016/j.polymertesting.2024.108605

Yao Xiao , Biao Li , Pengfei Diao , Yinggang Huang , Xiangxu Li , Chuansheng Wang , Huiguang Bian

{"title":"Raw rubber network of acid-free natural rubber and its application with solution-polymerized styrene butadiene rubber in green tires","authors":"Yao Xiao , Biao Li , Pengfei Diao , Yinggang Huang , Xiangxu Li , Chuansheng Wang , Huiguang Bian","doi":"10.1016/j.polymertesting.2024.108605","DOIUrl":"10.1016/j.polymertesting.2024.108605","url":null,"abstract":"<div><div>Natural raw rubber was prepared by flash evaporation process (VNR), its raw rubber network was compared with that of acid-coagulated rubber (STR20), and the effects of the ratios of VNR and STR20 to SSBR on the comprehensive performance of green tire composites were investigated. The results showed that compared with 80SSBR composites, the tensile strength and tensile product coefficient of 80VNR composites were improved by 23 % and 94 %, and the Payne effect, compression heat generation, and rolling resistance were reduced by 39 %, 9 %, and 5 %, respectively. Compared with 40STR20/40SSBR composites, the tensile product coefficient, wear resistance, and wet skid resistance of 40VNR/40SSBR composites are increased by 11 %, 5 %, and 5 %, respectively, and the Payne effect, compression heat generation, and rolling resistance were reduced by 46 %, 11 %, and 5 %, respectively. This study increased the amount of natural rubber in the green tire formulations, improving the performance of composites while achieving sustainability.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"140 ","pages":"Article 108605"},"PeriodicalIF":5.0,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421853","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Experimental and analytical study on the compressive behavior of PMI foam with different densities and cell sizes under intermediate strain rates 不同密度和单元尺寸的聚甲基丙烯酸甲酯泡沫在中等应变速率下的压缩行为的实验和分析研究

IF 5 2区材料科学

Polymer Testing Pub Date : 2024-10-02 DOI: 10.1016/j.polymertesting.2024.108593

Peilin Zhu, Jili Rong, Shenglong Wang, Zichao Chen

{"title":"Experimental and analytical study on the compressive behavior of PMI foam with different densities and cell sizes under intermediate strain rates","authors":"Peilin Zhu, Jili Rong, Shenglong Wang, Zichao Chen","doi":"10.1016/j.polymertesting.2024.108593","DOIUrl":"10.1016/j.polymertesting.2024.108593","url":null,"abstract":"<div><div>Polymethacrylimide (PMI) foam materials have great potential for applications in the field of protective energy absorption owing to their superior compressive properties. Existing studies on the mechanical behavior of PMI foams are limited, particularly for loading at intermediate strain rates. This paper presents a comprehensive experimental study of PMI foam with four different densities under quasi-static and intermediate strain rate compression (0.001 s<sup>−1</sup> to 100 s<sup>−1</sup>). Each density included three different cell sizes to determine their effects on the compressive performance. Loads parallel and perpendicular to the foam rise direction were considered to investigate the anisotropic behavior. Intermediate strain rate tests were conducted using a high-speed hydraulic servo testing machine, which achieved a stable strain rate while ensuring consistent specimen sizes in both quasi-static and dynamic tests. In all the experiments, the compression process was captured using a high-speed camera and the macroscopic deformation mode and microscopic deformation mechanism were analyzed by combining Digital Image Correlation (DIC) and Scanning Electron Microscopy (SEM). The PMI foam with finer cell sizes exhibited an enhanced compression performance. As the strain rate increased, the strain rate effect became more evident in the high-density specimens and an increase in cell size diminished this effect. A modified analytical model incorporating the cell-size correction term was developed based on Gibson and Ashby's model. The modified model exhibited an average error of 4.9 % in the predicted plateau stress of PMI foam with different cell sizes at the same density.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"140 ","pages":"Article 108593"},"PeriodicalIF":5.0,"publicationDate":"2024-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The mesophase of PLA in binary materials with ATBC and in composites with ATBC and mesoporous MCM-41 聚乳酸与 ATBC 的二元材料以及 ATBC 与介孔 MCM-41 的复合材料中的中间相

IF 5 2区材料科学

Polymer Testing Pub Date : 2024-09-28 DOI: 10.1016/j.polymertesting.2024.108602

Enrique Blázquez-Blázquez , Rosa Barranco-García , Tamara M. Díez-Rodríguez , María L. Cerrada , Ernesto Pérez

{"title":"The mesophase of PLA in binary materials with ATBC and in composites with ATBC and mesoporous MCM-41","authors":"Enrique Blázquez-Blázquez , Rosa Barranco-García , Tamara M. Díez-Rodríguez , María L. Cerrada , Ernesto Pérez","doi":"10.1016/j.polymertesting.2024.108602","DOIUrl":"10.1016/j.polymertesting.2024.108602","url":null,"abstract":"<div><div>Several composites of an <em>L</em>-rich polylactide (PLA) with acetyl tri-<em>n</em>-butyl citrate (ATBC), and mesoporous particles of Mobil Composition of Matter No. 41 (MCM-41) have been prepared in order to overcome the important drawback of PLA related to its rather low crystallization rate. Additionally of solving that deficiency, the mesophase of PLA has been spontaneously formed in two specimens just by standing at room temperature. This finding was ascertained from the corresponding X-ray diffractograms, which are similar to those observed for the mesophase obtained by stretching experiments. When the mesophase is initially present, its nucleation ability for recrystallization is significantly higher than the one exhibited by amorphous samples, as shown by both DSC and real-time variable-temperature synchrotron diffraction experiments. Moreover, the mesophase displays relatively small values of the long spacing, around 10–11 nm, compared with the values of about 16–18 nm found in the crystals. On the other hand, the mesophase shows in most cases an intermediate degree of order between the amorphous and crystalline phases, as stated by FTIR measurements. Its most characteristic feature is the observation of a distinctive peak at 916 cm<sup>−1</sup>, while the crystals show a specific peak at 923 cm<sup>−1</sup> for the α′ phase and at 921 cm<sup>−1</sup> for the α modification. The low-frequency region of the spectra below around 800 cm<sup>−1</sup>, scarcely commented in literature, has also been found especially sensitive to ordering.</div></div>","PeriodicalId":20628,"journal":{"name":"Polymer Testing","volume":"140 ","pages":"Article 108602"},"PeriodicalIF":5.0,"publicationDate":"2024-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142421850","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0