Advances in Polymer Technology最新文献_第10页

Effects of Prepolymerization, Temperature, and Hydrogen Concentration on Kinetics of Propylene Bulk Polymerization Using a Commercial Ziegler-Natta Catalyst 预聚合、温度和氢浓度对商用Ziegler-Natta催化剂丙烯本体聚合动力学的影响

IF 3.1 4区工程技术

Advances in Polymer Technology Pub Date : 2022-10-10 DOI: 10.1155/2022/9980759

Huiyue Liu, Gaiping Du, Yafeng Du, Dezhan Li, Jiangbo Chen

{"title":"Effects of Prepolymerization, Temperature, and Hydrogen Concentration on Kinetics of Propylene Bulk Polymerization Using a Commercial Ziegler-Natta Catalyst","authors":"Huiyue Liu, Gaiping Du, Yafeng Du, Dezhan Li, Jiangbo Chen","doi":"10.1155/2022/9980759","DOIUrl":"https://doi.org/10.1155/2022/9980759","url":null,"abstract":"The effects of prepolymerization, temperature, and hydrogen concentration on propylene bulk polymerization with a commercial Ziegler-Natta catalyst were investigated, and the apparent polymerization rate constants were estimated by varying reaction temperatures, hydrogen partial pressures, and polymerization methods. It was shown that prepolymerization has different effects on the polymerization rate and isotacticity of the polymer; without prepolymerization, the polymerization rate and isotacticity reach their maximum at 70°C and 80°C, respectively, whereas the polymerization rate and isotacticity with prepolymerization increase with the polymerization temperature in the range of 50-80°C. Moderate prepolymerization time reduced the fine fraction while increasing polymerization rate and isotacticity. Appropriate prepolymerization technique can increase mass transfer performance and fragmentation, which is a promising way to improve polymerization rate, isotacticity index, and fine fraction. Otherwise, insufficient prepolymerization or excessive prepolymerization causes prepolymer particle fragmentation.","PeriodicalId":7372,"journal":{"name":"Advances in Polymer Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44235485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Synergistically Improving Mechanical and Interfacial Properties of Epoxy Resin and CFRP Composites by Introducing Graphene Oxide 引入氧化石墨烯协同改善环氧树脂和CFRP复合材料的力学性能和界面性能

IF 3.1 4区工程技术

Advances in Polymer Technology Pub Date : 2022-10-08 DOI: 10.1155/2022/8309259

Lijuan Cao, Jieying Zhi, Yu Yang, Liye Yuan, Yingjun Song, Xiaoxuan Lu, Chunxiang Lu

{"title":"Synergistically Improving Mechanical and Interfacial Properties of Epoxy Resin and CFRP Composites by Introducing Graphene Oxide","authors":"Lijuan Cao, Jieying Zhi, Yu Yang, Liye Yuan, Yingjun Song, Xiaoxuan Lu, Chunxiang Lu","doi":"10.1155/2022/8309259","DOIUrl":"https://doi.org/10.1155/2022/8309259","url":null,"abstract":"In this study, graphene oxide (GO) was employed as nanoscale reinforcement for the development of high-performance carbon fiber reinforced plastic (CFRP) composites. Initially, epoxy resin was modified by incorporating GO with different weight proportion from 0.05 to 0.6 wt.%. Then the unidirectional CFRP composites were prepared with the modified epoxy resin by winding and compression molding technique. The optimized GO-CFRP composites with GO content of 0.1 wt.% present tensile strength of 2756 MPa and monofilament interfacial shear strength of 29.06 MPa, respectively, which are 14.4% and 12.5% higher than the corresponding values of the pristine CFRP composites. To intuitively observe the fracture process of the CFRP composites, the digital image correlation system was employed. It is verified that the moderate addition of GO can improve the stress concentration of the CFRP composites during the deformation process. In addition, the reinforcing mechanism is investigated by analyzing the fracture surface of the modified epoxy resin and the CFRP composites. The results indicate that GO can make the cracks deflect or bifurcate along with the epoxy resin which closes to graphene, resulting in synergistically improved mechanical and interfacial properties of the GO-modified CFRP composites.","PeriodicalId":7372,"journal":{"name":"Advances in Polymer Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42840865","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Ethylene Polymerization through Neutral Nickel Complexes Bearing Cyclic Imides 含环亚胺的中性镍配合物的乙烯聚合

IF 3.1 4区工程技术

Advances in Polymer Technology Pub Date : 2022-10-06 DOI: 10.1155/2022/8788585

Hassan Arabi, M. S. Beheshti, A. Manteghi

引用次数: 0

Influence of Carbon Dioxide on the Glass Transition of Styrenic and Vinyl Pyridine Polymers: Comparison of Calorimetric, Creep, and Rheological Experiments 二氧化碳对苯乙烯和乙烯基吡啶聚合物玻璃化转变的影响:量热、蠕变和流变实验的比较

IF 3.1 4区工程技术

Advances in Polymer Technology Pub Date : 2022-10-03 DOI: 10.1155/2022/5602902

Felix Harden, M. Kargar, U. A. Handge

{"title":"Influence of Carbon Dioxide on the Glass Transition of Styrenic and Vinyl Pyridine Polymers: Comparison of Calorimetric, Creep, and Rheological Experiments","authors":"Felix Harden, M. Kargar, U. A. Handge","doi":"10.1155/2022/5602902","DOIUrl":"https://doi.org/10.1155/2022/5602902","url":null,"abstract":"The glass transition of amorphous polymers determines the mobility of polymer chains and the time scale of relaxation processes. The glass transition temperature is reduced by the presence of low molecular weight molecules, e.g., dissolved gases or organic solvents. The quantitative knowledge of reduction of the glass transition temperature caused by the addition of carbon dioxide in a polymer melt is highly relevant for foam extrusion. However, measurement of the reduction of glass transition temperature caused by gas loading has to be performed under elevated pressure which implies high experimental efforts. In this work, we discuss and compare three methods for determination of the influence of carbon dioxide on thermal properties of amorphous polymers, i.e., calorimetric measurements, creep tests, and rheological experiments. The advantages and disadvantages of these methods are elucidated. Furthermore, the influence of molecular structure of the styrenic and vinylpyridine polymers on the glass transition temperature is discussed. Polystyrene generally shows the highest reduction of glass transition temperature. Poly(2-vinylpyridine) and poly(4-vinylpyridine) show a slightly less pronounced behaviour in comparison to polystyrene because of the lower polarity of polystyrene. Poly(α-methyl styrene) is associated with a different dependence of glass transition temperature on gas loading in calorimetric and rheological experiments.","PeriodicalId":7372,"journal":{"name":"Advances in Polymer Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-10-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46922363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Mechanical Evaluation on Carbon/Basalt Fiber-Reinforced Hybrid Polymer Matrix Composite 碳/玄武岩纤维增强混杂聚合物基复合材料力学性能评价

IF 3.1 4区工程技术

Advances in Polymer Technology Pub Date : 2022-09-16 DOI: 10.1155/2022/7742349

R. Alshgari, M. Prasad, B. K. Srivastava, Mohammed Saleh Al Ansari, Parul Gupta, A. Sivakumar, S. Wabaidur, M. Islam, Abdi Diriba

引用次数: 1

Mechanical Properties of Epoxy Composite Using Papaya Slice Biochar and Areca Nut Chopped Fibre 木瓜切片生物炭与槟榔短切纤维复合环氧树脂的力学性能

IF 3.1 4区工程技术

Advances in Polymer Technology Pub Date : 2022-09-14 DOI: 10.1155/2022/4733375

T. Lakshmana Kishore, Kuma Gowwomsa Erko

引用次数: 0

Vibration Characteristics of Shear Thickening Fluid-Based Sandwich Structures 剪切增稠流体夹层结构的振动特性

IF 3.1 4区工程技术

Advances in Polymer Technology Pub Date : 2022-09-09 DOI: 10.1155/2022/6959485

Ping Wang, Zhiyuan Chen, K. Qian, Kejing Yu

{"title":"Vibration Characteristics of Shear Thickening Fluid-Based Sandwich Structures","authors":"Ping Wang, Zhiyuan Chen, K. Qian, Kejing Yu","doi":"10.1155/2022/6959485","DOIUrl":"https://doi.org/10.1155/2022/6959485","url":null,"abstract":"The vibration attenuation mechanism of shear thickening fluid- (STF-) filled sandwich structures was investigated in this study. Structural equivalent damping, stiffness, and mass increased simultaneously with the increase in the volume fraction of shear thickening fluid. However, the damping ratio decreased and natural frequency increased with the increase in structural mass. Thus, the damping ratio was not a monotonically increasing function of the volume fraction of STF. A modified shear strain model of the damping layer was developed based on the following conditions: (1) under the condition of small strain, shear thickening fluid was regarded as linear viscoelastic material, and (2) the warpage of the sandwich beam was considered during deformation and the influence of STF on the shear strain of sandwich beam. According to the modified shear strain model of the damping layer, the shear thickening occurred at 1 Hz to 20 Hz during vibration. Therefore, the resonance point of the structure shifted to the left. The predictions were in excellent agreement with the experimental results. The results demonstrated that shear thickening fluid improved the vibration damping performance of the sandwich structure, while the thickening ability was not the higher, the better.","PeriodicalId":7372,"journal":{"name":"Advances in Polymer Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47344626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Hydrogel-Crosslinked Microneedles Based on Microwave-Assisted Drying Method 基于微波干燥法的水凝胶交联微针

IF 3.1 4区工程技术

Advances in Polymer Technology Pub Date : 2022-09-08 DOI: 10.1155/2022/2220918

Dongyu Chen, Yu Zhang, Xiaoke Chen, Qiyao He, Tianwei Wu, Xiaoping Cao, Jing Liu, Xueqiu You

引用次数: 1

Investigation on Physical and Mechanical Properties of Abaca Fiber Composites Using Filament Winding 纤维缠绕阿巴卡纤维复合材料的物理力学性能研究

IF 3.1 4区工程技术

Advances in Polymer Technology Pub Date : 2022-09-02 DOI: 10.1155/2022/5000547

R. Alshgari, N. Hemalatha, A. Suryavanshi, D. Prasad, R. Subalakshmi, M. Abirami, M. Amudha, S. Wabaidur, M. Islam, David Christopher

{"title":"Investigation on Physical and Mechanical Properties of Abaca Fiber Composites Using Filament Winding","authors":"R. Alshgari, N. Hemalatha, A. Suryavanshi, D. Prasad, R. Subalakshmi, M. Abirami, M. Amudha, S. Wabaidur, M. Islam, David Christopher","doi":"10.1155/2022/5000547","DOIUrl":"https://doi.org/10.1155/2022/5000547","url":null,"abstract":"Composites that were made stronger with jute fiber and glass fiber were used to test the performance of filament wound abaca fiber composites. Tensile, bending, and dynamic mechanical analyses were used to figure out the mechanical properties of the composites. Fiber composites and glass-fiber composites were found to have higher density and mechanical properties than abaca fiber-based composites. This is because resin did not get into the cell cavity of the fiber’s inner tissue structure. The abaca fiber composites that worked the worst were those in which the fibers were pulled out while the fibers on the surface were torn. The fiber-reinforced epoxy circumferential composite interface junction in the twisting abaca fiber circumferential composite was found to be more flexible and have a higher glass transition temperature than any of the other composites (6000 MPa). We found that twisting abaca fiber-naval ordnance laboratory and twisting abaca fiber-prepared circumferential composite had the lowest frequency dependence and performance variability. To improve composite properties, both the outside and inside structures of twisting abaca fiber need to be fixed. There is also a rise in fiber-to-resin contact and a rise in fiber surface area. The diameter of the fibers also gets smaller.","PeriodicalId":7372,"journal":{"name":"Advances in Polymer Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44158535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Synthesis, Characterizations, and Thermochromic Properties of VO2 Particles Grafted with PSS : PEDOT PSS: PEDOT接枝VO2粒子的合成、表征及热致变色性能

IF 3.1 4区工程技术

Advances in Polymer Technology Pub Date : 2022-09-01 DOI: 10.1155/2022/1866280

Onruthai Srirodpai, J. Wootthikanokkhan, S. Nawalertpanya

{"title":"Synthesis, Characterizations, and Thermochromic Properties of VO2 Particles Grafted with PSS : PEDOT","authors":"Onruthai Srirodpai, J. Wootthikanokkhan, S. Nawalertpanya","doi":"10.1155/2022/1866280","DOIUrl":"https://doi.org/10.1155/2022/1866280","url":null,"abstract":"Vanadium dioxide (VO2) particles were modified by grafting with poly(styrene sulfonate) (PSS) and poly(3,4-ethylenedioxythiophene) (PEDOT) via surface-initiated atom transfer radical polymerization (SI-ATRP). Critical transition temperature (\u0000 \u0000 \u0000 \u0000 T\u0000 \u0000 \u0000 c\u0000 \u0000 \u0000 \u0000 ) of the modified VO2 ranging between 77 and 79°C was obtained. After mixing with acrylic-based emulsion, dispersion of the VO2 particles in the polymer matrix was significantly improved. The visible light transmittance through the composite films above 75% was maintained if a concentration of the modified VO2 particles loaded into acrylic polymer film was no greater than 1.0 wt%. The NIR transmittance through the acrylic/VO2@PSS : PEDOT also dropped by 9-10%, compared with that of the pure acrylic film (without any particles). Finally, glass substrates coated with the acrylic/VO2@PSS : PEDOT composite films could reduce the temperature inside a model house by 5-6°C, compared with that of the control system (pure acrylic coating film without VO2 particles). Overall, this work demonstrated that it was possible to improve the dispersion of VO2 particles in polymer films without sacrificing its NIR shielding ability by grafting the surface of VO2 particles with PSS : PEDOT chains, while providing the optimum grafting density and particle loading.","PeriodicalId":7372,"journal":{"name":"Advances in Polymer Technology","volume":null,"pages":null},"PeriodicalIF":3.1,"publicationDate":"2022-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42322069","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0