Prime Archives in Polymer Technology最新文献

CaCO3–Polymer Nanocomposite Prepared with Supercritical CO2 超临界CO2制备caco3 -聚合物纳米复合材料

Prime Archives in Polymer Technology Pub Date : 2018-08-01 DOI: 10.1155/2018/9783941

H. Wakayama

引用次数: 2

Single-Crystal to Single-Crystal Structural Transformations of Amino-Acid-Based Coordination Polymers: Syntheses and Structural Characterization 氨基酸基配位聚合物的单晶到单晶结构转变:合成和结构表征

Prime Archives in Polymer Technology Pub Date : 1900-01-01 DOI: 10.37247/papt.1.2019.1-23

T. Tseng, Tzuoo‐Tsair Luo, Hsiao-shan Chiu, Chih‐Chieh Wang, Gene-Hsiang Lee, H. Sheu, Kuang‐Lieh Lu

{"title":"Single-Crystal to Single-Crystal Structural Transformations of Amino-Acid-Based Coordination Polymers: Syntheses and Structural Characterization","authors":"T. Tseng, Tzuoo‐Tsair Luo, Hsiao-shan Chiu, Chih‐Chieh Wang, Gene-Hsiang Lee, H. Sheu, Kuang‐Lieh Lu","doi":"10.37247/papt.1.2019.1-23","DOIUrl":"https://doi.org/10.37247/papt.1.2019.1-23","url":null,"abstract":"A discrete complex [Zn(tpro)2(H2O)2] (1, Htpro = L-thioproline), and two structural isomers of coordination polymers, a 1D chain of [Zn(tpro)2]n (2) and a layer structure of [Zn(tpro)2]n (3), have been synthesized and characterized. The discrete complex 1 undergoes a single-crystal to single-crystal temperature-driven structural transformation, leading to a 1D helical coordination polymer 2. Compound 3 has a 2D homochiral layer network with a (4,4) topology. These layers are mutually linked through hydrogen bonding interactions, resulting in the formation of a 3D network. When 1 was heated, it undergoes almost completely conversion to the microcrystalline of compound 2, which was confirmed by powder X-ray diffractions (PXRD). After removing the coordinated water molecules by heating at temperature of up to 150 C, the carboxylate motifs could be activated and their orientations became distorted, after which, they attacked the activation sites of the Zn(II) centers, leading to a the formation of a 1D helix. Moreover, a portion of the PXRD pattern of 3 was converted into a pattern for 2, and the ratio between 2 and 3 was precisely determined by the simulating study of the synchrotron in situ PXRD patterns. Consequently, such a 0D complex is capable of underdoing single-crystal to single-crystal transformations and can be converted into 1D and/or 2D amino acid-based coordination polymers. Prime Archives in Polymer Technology www.videleaf.com","PeriodicalId":429188,"journal":{"name":"Prime Archives in Polymer Technology","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120953925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nano-Structure Studies of Perhydropolysilazane - Derived Silica Thin Layers 过氢聚硅氮烷衍生二氧化硅薄层的纳米结构研究

Prime Archives in Polymer Technology Pub Date : 1900-01-01 DOI: 10.37247/PAPT.1.2021.23

T. Niizeki, Y. Hasegawa, K. Akutsu-Suyama

{"title":"Nano-Structure Studies of Perhydropolysilazane - Derived Silica Thin Layers","authors":"T. Niizeki, Y. Hasegawa, K. Akutsu-Suyama","doi":"10.37247/PAPT.1.2021.23","DOIUrl":"https://doi.org/10.37247/PAPT.1.2021.23","url":null,"abstract":"The structure of perhydropolysilazane (PHPS)-derived silica (PDS) thin layers which were synthesized on the surface of the Si-, Al 2 O 3 -, MgO-, and polyvinyl alcohol PVA-substrate have been studied by neutron reflectivity (NR) analyses. The results suggested that uniform PDS thin layers were synthesized on the surface of the substrates and the density of the layers varied depending on the type of substrate. Since the change in PDS density is correlated with the p K a value of the OH group on the substrate, it can be suggested that the acidity of the substrate would be one of the main factors determining the density of the coated PDS thin layers. On the other hand, the fine nanostructure of the PDS thin layer in the deep-buried condition have been poorly understood because a large background scattering originating from the sample matrix is a major obstacle for fine-structure analysis of a nanometric layer buried in a bulk material. As polarization analysis can decrease undesired scattering in a NR profile, we performed NR experiments with polarization analysis on a polypropylene (PP)/PDS/Si substrate sample, having a deep-buried layer of SiO 2 for increasing the amplitude of the Kiessig fringes in the higher scattering vector ( Q z ) region of the NR profiles in the sample by decreasing the undesired background scattering. Fitting and Fourier transform analysis results of the NR data indicated that the synthesized PDS layer remained between the PP plate and Si substrate with a thickness of approximately 109 Å. Furthermore, the scattering length density of the PDS layer, obtained from the background subtracted data appeared to be more accurate than that obtained from the raw data. Although the density of the PDS layer was lower than that of natural SiO 2 , the PDS thin layer had adequate mechanical strength to maintain a uniform PDS layer in the depth-direction under the deep-buried condition.","PeriodicalId":429188,"journal":{"name":"Prime Archives in Polymer Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130060182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal Analysis of MWCNTs / NR Polymer Composite Aligned in a Magnetic Field MWCNTs / NR聚合物复合材料在磁场中排列的热分析

Prime Archives in Polymer Technology Pub Date : 1900-01-01 DOI: 10.37247/papt.1.2019.01-014

Jin Xu, Yan He

引用次数: 0

Polyelectrolytes from Modified Natural Polysaccharides 改性天然多糖的聚电解质

Prime Archives in Polymer Technology Pub Date : 1900-01-01 DOI: 10.37247/papt.1.2019.1-6

A. Moral, R. Aguado, Andrea Pipió, A. Tijero, Menta Ballesteros

引用次数: 0

Effect of Degumming in the Characteristics of Silk Fibroin Nanoparticles 脱胶对丝素纳米颗粒特性的影响

Prime Archives in Polymer Technology Pub Date : 1900-01-01 DOI: 10.37247/papt.1.2020.9

G. Carissimi, A. A. Lozano-Pérez, G. Mercedes, Montalbán, S. Aznar-Cervantes, J. L. Cénis, G. Víllora

{"title":"Effect of Degumming in the Characteristics of Silk Fibroin Nanoparticles","authors":"G. Carissimi, A. A. Lozano-Pérez, G. Mercedes, Montalbán, S. Aznar-Cervantes, J. L. Cénis, G. Víllora","doi":"10.37247/papt.1.2020.9","DOIUrl":"https://doi.org/10.37247/papt.1.2020.9","url":null,"abstract":"Several studies have stated that the process used for sericin removal, or degumming, from silk cocoons has a strong impact on the silk fibroin integrity and consequently in their mechanical or biochemical properties after processing it into several biomaterials (e.g., fibers, films or scaffolds) but still, there is a lack of information of the impact on the features of silk nanoparticles. In this work, silk cocoons were degummed following four standard methods: autoclaving, short alkaline (Na 2 CO 3 ) boiling, long alkaline (Na 2 CO 3 ) boiling, and ultrasounds. The resultant silk fibroin fibers were dissolved in the ionic liquid 1-ethyl-3-methylimidazolium acetate and used for nanoparticle synthesis by rapid desolvation in polar organic solvents. The relative efficiencies of the degumming processes and the integrity of the resulting fibroin fibers obtained were analyzed by mass loss, optical microscopy, thermogravimetric analysis, infrared spectroscopy, and SDS-PAGE. Particle sizes and morphology were analyzed by Dynamic Light Scattering and Field Emission Scanning Electronic Microscopy. The results showed that the different treatments had a remarkable impact on the integrity of the silk fibroin chains, as confirmed by gel electrophoresis, which can be correlated with particle mean size and size distribution changes. The smallest nanoparticles (156 ± 3 nm) and the most negative Z potential (−30.2 ± 1.8 mV) were obtained with the combination of long treatment (2 h) of boiling in alkaline solution (Na 2 CO 3 0.02 eq/L). The study confirms that parameters of the process, such as the composition of the solution and time of the degumming step, must be controlled in order to reach an optimum reproducibility of the nanoparticle production.","PeriodicalId":429188,"journal":{"name":"Prime Archives in Polymer Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124841027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1