Cellular Polymers最新文献_第9页

Added-value porous materials for controlled thymol release obtained by supercritical CO2 impregnation process 超临界CO2浸渍法制备控制百里酚释放的附加值多孔材料

IF 1.6 4区医学

Cellular Polymers Pub Date : 2019-09-09 DOI: 10.1177/0262489319872329

S. Milovanović, D. Marković, J. Ivanovic

{"title":"Added-value porous materials for controlled thymol release obtained by supercritical CO2 impregnation process","authors":"S. Milovanović, D. Marković, J. Ivanovic","doi":"10.1177/0262489319872329","DOIUrl":"https://doi.org/10.1177/0262489319872329","url":null,"abstract":"This study explores utilization of biodegradable and biocompatible polymers for controlled release of natural bioactive substance. For that purpose, poly(ε-caprolactone) (PCL) beads, cellulose acetate (CA) film, and poly lactic-co-glycolic acid (PLGA) flakes were impregnated with thymol by employing environmentally friendly process of supercritical carbon dioxide (scCO2) impregnation. At selected pressure and temperature, prolongation of operating time increased thymol loading. Pure scCO2 did not affect CA film with average pore diameter of approximately 3 µm, while it enabled change of PCL beads and PLGA flakes into foams with average pore diameter approximately 175 µm and 87 µm, respectively. Additionally to scCO2, thymol acted as a plasticizer increasing pore size of polymers up to three times. Kinetic of thymol release from selected samples was tested using phosphate buffer saline at 37°C and successfully described with Korsmeyer–Peppas, zero-order, first-order, and Higuchi models. The suggested method of PCL, CA, and PLGA supercritical impregnation led to development of porous, solvent free, added-value materials that release thymol in a controlled manner from 5 h to several days.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":"38 1","pages":"153 - 166"},"PeriodicalIF":1.6,"publicationDate":"2019-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0262489319872329","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46502546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Injection-molded lightweight and high electrical conductivity composites with microcellular structure and hybrid fillers 注射成型轻量化高导电性复合材料与微孔结构和混合填料

IF 1.6 4区医学

Cellular Polymers Pub Date : 2019-09-02 DOI: 10.1177/0262489319871747

Shenghui Tian, Binbin Dong, Yahao Guo, Can Zhao, Mengxia Zhang, Mengjun Xiao

{"title":"Injection-molded lightweight and high electrical conductivity composites with microcellular structure and hybrid fillers","authors":"Shenghui Tian, Binbin Dong, Yahao Guo, Can Zhao, Mengxia Zhang, Mengjun Xiao","doi":"10.1177/0262489319871747","DOIUrl":"https://doi.org/10.1177/0262489319871747","url":null,"abstract":"Polypropylene/carbon black (PP/CB) and PP/CB/multiwalled carbon nanotube (PP/CB/MWCNT) composites were fabricated by solid and foam injection molding, with the goal of enhancing the electrical conductivity of the composites while decreasing the cost of the final product. The foaming behavior and through-plane (T-P) electrical conductivity of the composites were characterized and analyzed. Cell growth increased the interconnection of the conductive fillers, changed the filler orientation, and enhanced the T-P electrical conductivity of the composites. Under appropriate processing conditions (200°C melt temperature, 70 cm3/s injection flow rate, and 5% void fraction), the T-P electrical conductivity of the foam PP/CB composites was 5 orders of magnitude higher than that of the solid composites (from 5.877 × 10−12 S/m to 1.010 × 10−7 S/m). Moreover, the T-P electrical conductivity values of the PP/CB and PP/CB/MWCNT were compared at the same conductive fillers content (15 wt%). The results showed that the T-P electrical conductivity of the PP/CB/MWCNT composites was far higher than that of the PP/CB composites by almost five orders of magnitude because the MWCNT acted as a bridge between CB particles, and a unique geometric shape was formed in the system. The T-P electrical conductivity of the foam PP/CB/MWCNT composites with 15 wt% carbon fillers was higher than that of the solid PP/CB composites with 20 wt% carbon fillers. This study reveals that the effect of foaming and the addition of hybrid fillers can improve the T-P electrical conductivity of plastic products, which is very important for the development of lightweight conductive plastics.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":"34 3-4","pages":"131 - 152"},"PeriodicalIF":1.6,"publicationDate":"2019-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0262489319871747","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41301466","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Effects of dynamic mold temperature control on melt pressure, cellular structure, and mechanical properties of microcellular injection-molded parts: An experimental study 模具动态温度控制对微孔注射成型件熔体压力、孔结构和力学性能的影响：实验研究

IF 1.6 4区医学

Cellular Polymers Pub Date : 2019-08-29 DOI: 10.1177/0262489319871741

Guiwei Dong, Guoqun Zhao, Junji Hou, Guilong Wang, Y. Mu

{"title":"Effects of dynamic mold temperature control on melt pressure, cellular structure, and mechanical properties of microcellular injection-molded parts: An experimental study","authors":"Guiwei Dong, Guoqun Zhao, Junji Hou, Guilong Wang, Y. Mu","doi":"10.1177/0262489319871741","DOIUrl":"https://doi.org/10.1177/0262489319871741","url":null,"abstract":"In this work, the effects of dynamic mold temperature control (DMTC) on melt pressure, cellular structure, and mechanical properties of microcellular injection molding (MIM)-molded parts are investigated experimentally. It is found that with the increase of the mold temperature, the duration of foaming pressure in the cooling stage increases. Meanwhile, the average cell diameter and cell diameter dispersion increases as well as the cell density decreases in MIM molded parts. The turning point of mold temperature after which the foaming pressure in the cooling stage and the cellular structure in MIM molded parts generate a significant change is around the glass transition temperature of the used plastic material. Under DMTC conditions, with the increase of mold temperature, the tensile strength, flexural strength, and impact strength of MIM molded specimens of single gate without weld line change a little, while the tensile strength, flexural strength of MIM molded specimens of double gates with weld line increase obviously. When the mold temperature increases to 120°C and over, the tensile strength, flexural strength of MIM molded specimens of double gates with weld line reach an equivalent level of specimens of single gate without weld line.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":"38 1","pages":"111 - 130"},"PeriodicalIF":1.6,"publicationDate":"2019-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0262489319871741","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48885626","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microcellular morphology evolution of polystyrene/thermoplastic polyurethane blends in the presence of supercritical CO2 超临界CO2存在下聚苯乙烯/热塑性聚氨酯共混物的微孔形态演变

IF 1.6 4区医学

Cellular Polymers Pub Date : 2019-06-06 DOI: 10.1177/0262489319852335

Z. Qu, Jianguo Mi, Yang Jiao, Hongfu Zhou, Xiangdong Wang

引用次数: 9

Effect of acrylonitrile–butadiene–styrene terpolymer on the foaming behavior of polypropylene 丙烯腈-丁二烯-苯乙烯三元共聚物对聚丙烯发泡行为的影响

IF 1.6 4区医学

Cellular Polymers Pub Date : 2019-05-30 DOI: 10.1177/0262489319852331

Xiaoyan Tan, Ying‐Guo Zhou, Jinghong Zhou, Binbin Dong, Chun-tai Liu, Bai‐Ping Xu

{"title":"Effect of acrylonitrile–butadiene–styrene terpolymer on the foaming behavior of polypropylene","authors":"Xiaoyan Tan, Ying‐Guo Zhou, Jinghong Zhou, Binbin Dong, Chun-tai Liu, Bai‐Ping Xu","doi":"10.1177/0262489319852331","DOIUrl":"https://doi.org/10.1177/0262489319852331","url":null,"abstract":"To improve the cellular foam structure of common polypropylene (PP), acrylonitrile–butadiene–styrene terpolymer (ABS) and compatibilizer were used to blend with PP, and the foaming behavior of PP/ABS blends was investigated. The solid and foamed samples of the PP/ABS blend with different component were first fabricated by melt extrusion followed by conventional injection molding with or without a blowing agent. The mechanical properties, thermal features, and rheological characterizations of these samples were studied using the tensile test, dynamic mechanical analyzer, differential scanning calorimetry, scanning electron microscopy, X-ray diffraction, and torque rheometry. The results suggest that ABS is a suitable candidate to improve the foamability of PP. The effect of ABS and compatibilizer on the foamability of PP can be attributed to three possible mechanisms, that is, the weak interaction between phases that facilitates cell nucleation, the improved gas-melt viscosity that prevents the escape of gas, and the influence of crystallization behavior that helps to form a fine foaming structure.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":"38 1","pages":"47 - 67"},"PeriodicalIF":1.6,"publicationDate":"2019-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0262489319852331","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46000944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 15

The foaming performance evaluation of fibrillated polytetrafluoroethylene and isotactic polypropylene blends 原纤化聚四氟乙烯和全同立构聚丙烯共混物的发泡性能评价

IF 1.6 4区医学

Cellular Polymers Pub Date : 2019-05-20 DOI: 10.1177/0262489319846785

Yun Zhang, C. Xin, Zeming Wang, Waqas Mughal, Yadong He

引用次数: 1

Evaluation of PVA/dextran/chitosan hydrogel for wound dressing PVA/葡聚糖/壳聚糖水凝胶用于伤口敷料的评价

IF 1.6 4区医学

Cellular Polymers Pub Date : 2019-04-08 DOI: 10.1177/0262489319839211

Shin-Ping Lin, Kai-Yin Lo, Tien-Ni Tseng, Jui-Ming Liu, Ting-Yu Shih, Kuan-Chen Cheng

引用次数: 33

Density graded polyethylene foams: Effect of processing conditions on mechanical properties 密度梯度聚乙烯泡沫：加工条件对机械性能的影响

IF 1.6 4区医学

Cellular Polymers Pub Date : 2019-03-31 DOI: 10.1177/0262489319839632

E. Cusson, A. Akbarzadeh, D. Therriault, D. Rodrigue

引用次数: 7

The effect on the surface activity and the structure of SPI caused by cleavage of disulfide bonds and by subsequent glucose modification 二硫键断裂和随后的葡萄糖修饰对SPI表面活性和结构的影响

IF 1.6 4区医学

Cellular Polymers Pub Date : 2019-01-01 DOI: 10.1177/0262489319843645

Fan Junfu, L. Junsheng, Wang Bixuan, Zhong Xin, Huang Guo-xia, Yan Liujuan, Ren Xiane

{"title":"The effect on the surface activity and the structure of SPI caused by cleavage of disulfide bonds and by subsequent glucose modification","authors":"Fan Junfu, L. Junsheng, Wang Bixuan, Zhong Xin, Huang Guo-xia, Yan Liujuan, Ren Xiane","doi":"10.1177/0262489319843645","DOIUrl":"https://doi.org/10.1177/0262489319843645","url":null,"abstract":"The main purpose of this study was to investigate the effects on the molecular structure and the properties of soybean proteins isolate (SPI) after two modifications: (1) peracetic acid oxidative cleavage of its disulfide bonds and (2) the subsequent addition of covalently bonded glucose to the SPI containing the cleaved disulfide bonds. An appropriate amount of peracetic acid will be capable of enhancing the surface properties of SPI significantly; however, excessive oxidation can obtain undesirable results. When the concentration of peracetic acid was 0.4%, following by 35.5% of the disulfide bond cleavage, compared with those of natural SPI, the foaming capacity (FC), foaming stability (FS), emulsifying capacity (EC), and emulsifying stability (ES) of oxidized-SPI were increased by 82.0%, 65.8%, 58.5%, and 41.5%, respectively. The surface activity of oxidized-SPI could be promoted by glucose modification, and the FC, FS, EC, and ES of oxidized-SPI have further risen to 146.8%, 96.0%, 131.4%, and 40.3%, respectively, after the further glucose modification. Particle size measurements showed bimodality for the SPI that was modified with glucose with a portion of smaller sizes seen. Fluorescence spectroscopy and circular dichroism measurements demonstrate that extensibility increases; flexibility is enhanced; and glycosylation occurs more readily due to the oxidation of SPI. When grafted with glucose, these oxidized soybean protein products produce more ideal foaming and display better emulsification properties.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":"38 1","pages":"31 - 44"},"PeriodicalIF":1.6,"publicationDate":"2019-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/0262489319843645","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43593424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Applications of Core Retraction in Manufacturing Low-Density Polypropylene Foams with Microcellular Injection Molding 缩芯技术在微孔注射成型制造低密度聚丙烯泡沫塑料中的应用

IF 1.6 4区医学

Cellular Polymers Pub Date : 2018-09-04 DOI: 10.1177/026248931803700101

H. Kharbas, Thomas Ellingham, L. Turng

{"title":"Applications of Core Retraction in Manufacturing Low-Density Polypropylene Foams with Microcellular Injection Molding","authors":"H. Kharbas, Thomas Ellingham, L. Turng","doi":"10.1177/026248931803700101","DOIUrl":"https://doi.org/10.1177/026248931803700101","url":null,"abstract":"Without modifying existing part and mold designs, the conventional microcellular injection molding (MIM) process can typically save about 5–10% material without encountering problems such as incomplete filling, excessive shrinkage, or deteriorating microstructure and mechanical properties. In this study core retraction was used in combination with the MIM process to produce thick polypropylene (PP) parts (up to 7.6 mm thick) with high density reductions of 30% and 55%. The cavity volume was modified by changing the retraction distance, which enabled control of density reductions. The lowest densities were achieved with this core retraction-aided microcellular injection molding (CR-MIM) process, the results of which could not have been achieved by the conventional MIM process alone. The effects of delay time in core retraction and weight reduction on the microstructure of the core and skin layers were investigated. It was shown that the CR-MIM process yielded better microstructure and tensile properties than the conventional MIM process. Use of core retraction also yielded more consistent densities and tensile properties throughout the length of the foamed parts.","PeriodicalId":9816,"journal":{"name":"Cellular Polymers","volume":"37 1","pages":"1 - 20"},"PeriodicalIF":1.6,"publicationDate":"2018-09-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1177/026248931803700101","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41867493","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1