搜索到1549篇“ POLYDIMETHYLSILOXANE“的相关文章
Recyclable and Self-healable Polydimethylsiloxane Elastomers Based on Knoevenagel Condensation
2025年
Elastomers are widely used in various fields owing to their excellent tensile properties.Recyclable and self-healing properties are key to extending the service life of elastomers.Accumulating evidence indicates that dynamic covalent chemistry has emerged as a powerful tool for constructing recyclable and self-healing materials.In this work,we demonstrate the preparation of a recyclable and self-healable polydimethylsiloxane(PDMS)elastomer based on the Knoevenagel condensation(KC)reaction.This PDMS elastomer was prepared by the KC reaction catalyzed by 4-dimethylaminopyridine(DMAP).The obtained PDMS elastomer exhibited an elongation at break of 266%,a tensile strength of 0.57 MPa,and a good thermal stability(Td=357℃).In addition,because of the presence of dynamic C=C bonds formed by the KC reaction and low glass transition temperature(Tg=-117℃).This PDMS exhibited good self-healing and recycling properties at room temperature and could be reprocessed by hot pressing.In addition,the PDMS elastomer exhibits good application prospects in the fields of adhesives and flexible electronic devices.
Yao-Wei ZhuTong-Tong ManMing-Ming ZhaoJia-Yi ChenYu YanXiao-Nong ZhangLi ChenChun-Sheng Xiao
关键词:ELASTOMERPOLYDIMETHYLSILOXANERECYCLABLESELF-HEALING
尿液中12种苯二氮卓类药物的聚二甲基硅氧烷海绵辅助分散液液微萃取/GC-MS法检测
2025年
设计了一种基于疏水多孔聚二甲基硅氧烷海绵辅助的分散液液微萃取装置(PDMS-Sponge-DLLME),并实现了对尿液中12种常见苯二氮卓类(BZDs)安眠药的快速高效提取,借助气相色谱-质谱(GC-MS)直接进样完成检验鉴定。通过方糖提供的骨架实现疏水多孔有机PDMS海绵材料的制备,采用傅里叶变换红外光谱、扫描电镜对其微观结构性能进行表征,结合医用注射器、磁搅拌子及橡胶堵头完成该萃取装置的组装,利用内标法进行定量分析。在最优条件下,尿液中12种常见安眠药在0.1~10μg/mL范围内具有良好的线性关系,相关系数(r^(2))均大于0.99,检出限为0.025~0.200μg/mL,定量下限为0.050~0.400μg/mL,3个加标水平下的回收率为64.4%~112%,相对标准偏差为0.80%~9.4%。该新型分散液液微萃取装置可在数分钟内完成对尿液中安眠药的高效提取、富集,借助GC-MS即可实现快速检验,具有绿色、高效、简便、廉价等优势。
梁未未刘悦林贤文朱焕慧孙立敏陈晓晖王松才
关键词:分散液液微萃取苯二氮卓类药物尿液
表面接枝KH550的石墨烯改性聚二甲基硅氧烷热力学性能的分子动力学模拟
2025年
为分析表面接枝有硅烷偶联剂KH550的石墨烯对聚二甲基硅氧烷(PDMS)性能的影响,本工作采用分子动力学的方法对纯PDMS、未接枝KH550的石墨烯改性PDMS,以及表面接枝KH550的石墨烯(接枝密度分别为6%和12%)改性PDMS进行建模,从微观角度对比分析改性后PDMS热力学性能的提升。模拟结果表明,在PDMS中掺杂石墨烯或在石墨烯表面接枝KH550后再与PDMS混合,均能改善PDMS热导率、玻璃化转变温度、自由体积、均方位移及水分子的扩散系数和结合能等热力学性能。在含水模型中,接枝密度为6%和12%的表面接枝KH550石墨烯改性PDMS相较于纯PDMS 250 K热导率分别提高25.6%和21.6%,玻璃化转变温度分别提高70 K和77 K。对比接枝KH550的石墨烯改性PDMS的含水与不含水的模型可知,水分子能够提高均方位移,降低玻璃化转变温度和减小自由体积,同时水分子扩散系数及结合能随温度与接枝密度的不同而有所差异。本研究的结果可为减少冰闪电压对电力系统影响的实验研究提供参考,同时对研发输电线路融冰、疏水性材料提供理论支撑。
李亚莎田泽王璐敏庞梦昊曾跃凯赵光辉
关键词:热导率分子动力学模拟
Surface micro-arrays enhancing electromagnetic interference shielding of polydimethylsiloxane/multiwalled carbon nanotubes nanocomposites
2025年
Herein,the electromagnetic shielding performance of surface concave-convex(SC)and zig-zag micro-arrays was studied by using a simulation prediction and a three-dimensional(3D)printing custom model.Firstly,surface stripe concaveconvex(SSC)and surface cylindrical concave-convex(SCC)micro-arrays with or without zig-zag micro-arrays are designed,and their shielding performance is simulated in multi-bands(C-,X-band).The multiwalled carbon nanotubes/polydimethylsiloxane composites(MWCNT/PDMS)with different SC structures and different electrical conductivity are molded in acrylonitrile-butadiene-styrene copolymer(ABS)molds which are printed by a 3D printer.The results show that the electromagnetic interference shielding effectiveness(EMI SE)of the samples can be enhanced by constructing the SC micro-arrays with zig-zag micro-arrays,and improving with the increase of conductivity and frequency.In addition,the shielding mechanism of the SC-MWCNT/PDMS composites is investigated and discussed by an electromagnetic simulation.
Ke JiangZhi Chen JiYu Chen ZhengShan HuangMing Wang
Direct Ink Writing Method of Fractal Wearable Flexible Sensor Based on Conductive Graphene/Polydimethylsiloxane Ink
2025年
Flexible electronic technology has laid the foundation for complex human-computer interaction system,and has attracted great attention in the field of human motion detection and soft robotics.Graphene has received an extensive attention due to its excellent electrical conductivity;however,how to use it to fabricate wearable flexible sensors with complex structures remains challenging.In this study,we studied the rheological behavior of graphene/polydimethylsiloxane ink and proposed an optimal graphene ratio,which makes the ink have an good printability and conductivity at the same time.Then,based on the theory of Peano fractal layout,we proposed a two-dimensional structure that can withstand multi-directional tension by replacing the traditional arris structure with the arc structure.After that,we manufactured circular arc fractal structure sensor by adjusting ink composition and printing structure through direct ink writing method.Finally,we evaluated the detection performance and repeatability of the sensor.This method provides a simple and effective solution for fabricating wearable flexible sensors and exhibits the potential to fabricate 3D complex flexible electronic devices.
CHEN JunlingGAO FeiyangZHANG LimingZHENG Xiongfei
氨基修饰的聚二甲基硅氧烷复合膜的制备及其CO_(2)/N_(2)分离性能研究
2025年
聚二甲基硅氧烷(PDMS)被广泛用作气体分离复合膜中间层,但强疏水性的PDMS与大多数CO_(2)选择性材料界面粘附弱,严重影响膜分离性能和使用寿命,故需要进行表面改性。以无纺布基聚砜膜为支撑层,PDMS为选择层,通过添加氨基交联剂、预交联和控制热处理等方式制备了氨基修饰的PDMS复合膜,实现了PDMS表面功能改性和亲水性改善,同时有效抑制了带侧链基团的交联剂对膜空间结构的破坏,保持了CO_(2)高渗透通量与高选择性。研究了3-氨基丙基三甲氧基硅烷(APTMS)用量对复合膜结构、性能的影响。结果表明:m(APTMS)∶m(PDMS)=0.8时复合膜综合性能最优,其CO_(2)渗透率为5437.407GPU,CO_(2)/N_(2)选择性为10.680;m(APTMS)∶m(PDMS)大于0.4时,复合膜表面水接触角小于91°,相较于未改性PDMS复合膜水接触角(117.84°),水接触角降幅超过22%。
何文王波冯晗俊李桃肖睿
关键词:膜分离复合膜聚二甲基硅氧烷
基于多孔聚二甲基硅氧烷用于人体脉搏信号检测的压力传感器
2025年
随着最近智能可穿戴电子设备的快速增长,高性能柔性压力传感器也引起了很多关注。提出了一种直接而有用的方法,采用索氏萃取技术制备了多壁碳纳米管(MWCNTs)和二维石墨烯(GR)作为导电填料以及聚二甲基硅氧烷(PDMS)作为柔性基体的复合材料中的多孔结构,其中MWCNTs和GR构建了一个协同导电网络。因此,基于MWCNTs-GR/PDMS复合材料的压阻式压力传感器由于具有多孔结构和协同导电网络,拥有了良好的传感器特性,其优越性能包括响应快(~80 ms)、高稳定性(5000次循环)和高灵敏度(~0.618 kPa^(-1))。而且,所提出的传感器可以安装在人体和机器人手上,以检测人体活动,因此在可穿戴电子皮肤上具有很大的前景。
赵吉张阳阳李莉萍熊双洋梁雨轩
关键词:多孔结构
聚二甲基硅氧烷掺杂涂料的光热转化及超疏水防/除冰特征
2025年
光热超疏水涂料在航空航天、电力、交通、建筑等各个领域具有广泛的应用前景,为解决涂料的光热转化、防/除冰效率和使用寿命等问题,选用聚二甲基硅氧烷掺杂碳基光热转换材料多壁碳纳米管(MWCNTs)与二氧化硅纳米粒子、半导体材料Ti2O3制备光热超疏防/除冰涂料,分别涂覆于玻璃板、环氧树脂板、聚乙烯(PE)膜、铜板等四种基材表面。研究结果表明,涂料应用于玻璃板上时,其表面接触角可高达157.10°,除冰时间可由未涂覆前的870 s缩短至280 s;涂料涂覆于PE膜基材表现出俱佳的光热转化与超疏水性,其表面接触角最高可达154.67°,在MWCNTs质量分数为60%时光热转化温度最高达62.2℃,除冰时间可由涂覆涂料前的1020 s缩短至270 s,具备良好的超疏防/除冰效果;涂料应用于环氧树脂板上时,其表面接触角可高达156.55°,除冰时间可由涂覆涂料前的900 s缩短至300 s;此外,涂料涂覆于铜板表面时接触角可高达157.71°,表面覆冰可在160 s内快速融化。涂料于四种基材表面时均表现出优异的耐磨损与老化性能。研究结果为光热超疏防/除冰应用提供一种新策略。
王慧萍李亮毛航廖喜林廖喜林李淑静李淑静
关键词:光热转换超疏水涂料
拉伸条件下聚二甲基硅氧烷表面粗糙度对骨髓间充质干细胞成骨分化的影响
2025年
背景:研究表明,机械刺激对骨髓间充质干细胞的谱系特异性分化至关重要。然而,机械拉伸条件下不同粗糙度表面的骨髓间充质干细胞成骨分化情况尚不清楚。目的:探讨拉伸条件下聚二甲基硅氧烷(polydimethylsiloxane,PDMS)表面粗糙度对骨髓间充质干细胞成骨分化的影响及作用机制。方法:通过不同目砂纸(120目、1 000目和10 000目)在PDMS表面构建3种不同粗糙度的形貌(PDMS-120M、PDMS-1000M和PDMS-10000M),与空气接触的PDMS表面作为对照组。采用RT-q PCR检测静态条件下和拉伸条件下(0%,2%,4%,6%拉伸幅度)不同粗糙度PDMS表面的骨髓间充质干细胞中成骨相关基因表达。采用RT-q PCR、Western blot检测2%拉伸条件下不同粗糙度表面骨髓间充质干细胞中SIRT1、成骨相关基因和蛋白表达,采用碱性磷酸酶染色、茜素红染色观察2%拉伸条件下不同粗糙度PDMS表面骨髓间充质干细胞的成骨分化能力。结果与结论:(1)静态条件下粗糙度为(13.51±2.11)μmPDMS-1000M表面的骨髓间充质干细胞成骨基因表达最高;(2)相对光滑PDMS表面的骨髓间充质干细胞在4%拉伸幅度条件下有更好的成骨分化效果,而PDMS-1000M表面的骨髓间充质干细胞在2%拉伸幅度条件下有更好的成骨分化效果;(3)在2%拉伸幅度条件下,粗糙度为(13.51±2.11)μm PDMS-1000M表面的骨髓间充质干细胞有更好的成骨分化效果,可能与激活SIRT1信号通路有关。
胡泽遵杨反磊徐浩罗宗平
关键词:骨髓间充质干细胞成骨分化机械刺激机械拉伸SIRT1
Effective parameters on polydimethylsiloxane/graphene composite-based triboelectric nanogenerator performance
2024年
This paper systematically investigates the effective parameter ontheperformanceof polydimethylsiloxane/graphene(PDMS@Gr)-based triboelectric nanogenerators(TENGs)as well as their applications.PDMS@Gr films containing 0,0.05,0.5,1,and 1.5 wt.%graphene are synthesized,and their sur-face characteristics,mechanical behavior,and electrical prop-erties are characterized.Vertical contact-separation mode TENGs are fabricated,and their performance is evaluated.The results demonstrate that the surface roughness and sur-face charge density are the most critical parameters for the performance of PDMS@Gr-based TENGs compared to the elec-trical and mechanical properties of the friction layers.The PDMS@Gr-based TENG with 1 wt.%graphene shows the high-est power output of 2.6 W/m?at an optimized working con-dition(5 Hz and 15 N).It also exhibits stable power output until 15,oo0 working cycles and displays battery-free applica-tions by powering a light-emitting diode(LED)array,a calculator,a digital watch,and a digital thermometer.
Fattaneh SalemiFathallah KarimzadehMohammad-Hasan AbbasiFatemeh MoradiDuc Hoa PhamJaehwan Kim
关键词:GRAPHENEPOLYDIMETHYLSILOXANECOMPOSITE

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