Preparation and Characterization of High Latent Heat Thermal Regulating Fiber Made of PVA and Paraffin

2013 ◽  
Vol 8 (2) ◽  
pp. 155892501300800 ◽  
Author(s):  
Weixing Xu ◽  
Yichao Lu ◽  
Bin Wang ◽  
Jianjun Xu ◽  
Guangdou Ye ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Latent Heat ◽  
Wet Spinning ◽  
Structures And Properties ◽  
Spinning Process ◽  
Change Material ◽  
Thermal Stability Of ◽  
Better Than ◽  
High Latent Heat

A convenient method for preparing the thermal regulating fibers with high latent heat has been developed. PVA thermal regulating fibers were prepared via a wet spinning process, with paraffin being the phase change material. The structures and properties of these fibers were investigated by SEM, TGA, DSC and tensile strength tester. With the paraffin content in the fibers increasing from 30wt% to 70wt%, the latent heat of the fibers increases from 42.8J/g to 87.8J/g and the paraffin phase structures change from separation into partial interconnection. PVA matrix can not wrap paraffin effectively when the paraffin content increases up to 50wt%, so the paraffin loss in the spinning process increases. The thermal stability of fibers with low paraffin content is better than that of fibers with high paraffin content. After 100 heat-and-cool cycles, the latent heat of fibers lose a little. The tensile strength of these thermal regulating fibers is good enough for application in wrapping, filling, and nonwovens.

Preparation and Characterization of Polysulfone/Ru Nanocluster Hybrid Hollow Fiber Membrane

2014 ◽  
Vol 1053 ◽  
pp. 357-363
Author(s):  
Chun Yan Jiang ◽  
Cheng Yan ◽  
Shu Zheng Liu ◽  
Yu Hua Zhang ◽  
Ai Qing Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Average Diameter ◽  
Wet Spinning ◽  
Hybrid Membranes ◽  
Fiber Membrane ◽  
Structures And Properties ◽  
Spinning Process

Polysulfone/Ru nanocluster hybrid hollow fiber membranes with different Ru content were fabricated by the dry/wet spinning process. The structures and properties of Ru nanocluster, PSF hollow films and PSF/Ru hybrid hollow fiber films were characterized by TEM, SEM, XPS, XRD, TGA, etc. The results showed that the Ru particles, which may coordinate with O and S in polysulfone, distributed symmetrically with an average diameter about 1~2 nm. More finger-like pores of the hybrid membranes were obtained after adding Ru nanocluster, and the thermal properties of the membranes increased while the mechanical properties decreased.

scholarly journals Preparation and Characterization of Starch/Empty Fruit Bunch-Based Bioplastic Composites Reinforced with Epoxidized Oils

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 94
Author(s):  
Jianlei Yang ◽  
Yern Chee Ching ◽  
Cheng Hock Chuah ◽  
Nai-Shang Liou
Keyword(s):  
Tensile Strength ◽  
Control Sample ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Empty Fruit Bunch ◽  
Epoxidized Palm Oil ◽  
Negative Effect ◽  
Thermal Stability Of ◽  
Better Than

This study examined the development of starch/oil palm empty fruit bunch-based bioplastic composites reinforced with either epoxidized palm oil (EPO) or epoxidized soybean oil (ESO), at various concentrations, in order to improve the mechanical and water-resistance properties of the bio-composites. The SEM micrographs showed that low content (0.75 wt%) of epoxidized oils (EOs), especially ESO, improved the compatibility of the composites, while high content (3 wt%) of EO induced many voids. The melting temperature of the composites was increased by the incorporation of both EOs. Thermal stability of the bioplastics was increased by the introduction of ESO. Low contents of EO led to a huge enhancement of tensile strength, while higher contents of EO showed a negative effect, due to the phase separation. The tensile strength increased from 0.83 MPa of the control sample to 3.92 and 5.42 MPa for the composites with 1.5 wt% EPO and 0.75 wt% ESO, respectively. EOs reduced the composites’ water uptake and solubility but increased the water vapor permeability. Overall, the reinforcing effect of ESO was better than EPO. These results suggested that both EOs can be utilized as modifiers to prepare starch/empty-fruit-bunch-based bioplastic composites with enhanced properties.

Preparation and characterization of phase-change energy storage nonwoven fabric

2021 ◽  
pp. 152808372110417
Author(s):  
Zhou Zhao ◽  
Ningning Tong ◽  
Hong Song ◽  
Yan Guo ◽  
Jinmei Wang
Keyword(s):  
Phase Transition ◽  
Thermal Stability ◽  
Energy Storage ◽  
Phase Change ◽  
Nonwoven Fabric ◽  
Scanning Calorimetry ◽  
Change Material ◽  
Stretching Process ◽  
Thermal Stability Of

In this work, a phase-change energy storage nonwoven fabric was made of polyurethane phase-change material (PUPCM) by a non-woven melt-blown machine. Polyethylene glycol 2000 was used as the phase transition unit and diphenyl-methane-diisocyanate as the hard segment to prepare PUPCM. Thermal stability of the PUPCM was evaluated through thermal stability analysis. The performance of pristine PUPCM was determined by Fourier transform infrared spectroscopy and differential scanning calorimetry to analyze the spinning technology of spinning temperature and the stretching process. Phase-change energy storage nonwoven fabric (413.22 g/m2) was prepared, and the morphology, solid–solid exothermic phase transition, mechanical properties, and the structures were characterized. The enthalpy of solid–solid exothermic phase transition reached 60.17 mJ/mg (peaked at 23.14°C). The enthalpy of solid–solid endothermic phase transition reached 67.09 mJ/mg (peaked at 34.34°C). The strength and elongation of phase-change energy storage nonwoven fabric were found suitable for garments and tent fabrics.

scholarly journals Fabrication and Characterization of Biodegradable Composites from Poly (Butylene Succinate-Co-Butylene Adipate) and Taihu Lake Blue Algae

2017 ◽  
Vol 26 (5) ◽  
pp. 096369351702600 ◽  
Author(s):  
Wenjing Xia ◽  
Nianqing Zhu ◽  
Zhongbin Ni ◽  
Mingqing Chen
Keyword(s):  
Tensile Strength ◽  
Taihu Lake ◽  
Mechanical Performance ◽  
Value Added ◽  
Melt Blending ◽  
Butylene Succinate ◽  
Elongation At Break ◽  
Biodegradable Composites ◽  
Thermal Stability Of

Biodegradable composites from poly (butylene succinate-co-butylene adipate) (PBSA) and Taihu Lake (Wuxi, China) blue algae were prepared by melt blending. The property and structure of biocomposites were investigated. By adding extra amount of water to blue algae, the formulated blue algae acted as a plastic in the composites during blending, and exhibited a reinforcing effect on the PBSA matrix. With increasing blue algae content, the thermal stability of the composites decreased; the tensile strength at break and elongation at break of the composites reduced, but the Young's modulus of the composites increased. However, the composite with 30% blue algae loading still exhibited good mechanical performance (tensile strength at break of 21.3 MPa, elongation at break of 180%). The fabrication of value-added PBSA/algae composites appeared as an effective approach to reduce the secondary environmental pollution of Taihu blue algae.

Preparation and Characterization of Alginate/Polyvinyl Alcohol Composite Fibers Containing Copper Ions

2013 ◽  
Vol 652-654 ◽  
pp. 1562-1565 ◽  
Author(s):  
Jing Guo ◽  
Qian He Chen ◽  
Yu Yan Zhang ◽  
Yu Mei Gong ◽  
Hong Zhang
Keyword(s):  
Tensile Strength ◽  
Polyvinyl Alcohol ◽  
Copper Ions ◽  
Fiber Surface ◽  
Coagulation Bath ◽  
Wet Spinning ◽  
Composite Fibers ◽  
Pseudoplastic Fluid ◽  
Cu Ions

Alginate/polyvinyl alcohol (PVA) composite fibers containing copper ions were prepared by wet spinning. The spinning solution and manufacturing process were researched. The composite fibers were characterized by Tensile Strength Tester, SEM and TGA. This report shows that the spinning solution is a typical kind of pseudoplastic fluid. Adding boric acid to coagulation bath and putting Cu ions into composite fibers can improve the strength. The structure of composite fibers with Cu ions is denser and there are grooves on the fiber surface. In addition, the thermal property of composite fibers is steady.

Preparation and Characterization of Degradable Poly(silyl ester) and the Self-Crosslinking Reaction of Poly(silyl ester) without Solvent

2010 ◽  
Vol 129-131 ◽  
pp. 862-866
Author(s):  
De Jie Zhou ◽  
Nian Feng Han ◽  
Xin De Tang
Keyword(s):  
The Self ◽  
Crosslinking Reaction ◽  
Scanning Calorimetry ◽  
Viscous Liquids ◽  
Tert Butyl ◽  
Silyl Ester ◽  
Linear Poly ◽  
Thermal Stability Of ◽  
Better Than

The new poly(silyl ester) has been prepared by the polycondensation reaction of 1,5-dichloro-1,1,5,5-tetramethyl-3,3-diphenyl-trisi1oxane with di-tert-butyl fumarate by the elimination of tert-butyl chloride as a driving force. To investigate the self-crosslinking reaction of the unsaturated poly(silyl ester), poly(1,1,5,5-tetramethyl-3,3-diphenyltrisiloxane) was self- crosslinked in the presence of 2, 2'-azobis(isobutyronitri1e) (AIBN) as a radical initiator without solvent. After the self-crosslinking, the unsaturated poly(silyl ester), which was viscous liquids, turned into solid product. The characterization of the poly(silyl ester) and the self-crosslinked product included 1H-NMR spectroscopy, differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Comparisons were made between the linear poly(silyl ester) and the self-crosslinked products. It was found that after crosslinking, the important resonance signal for ethenylene (C=C) of the poly(silyl ester) reduced, which show that the crosslinking reaction is carried out. The self-crosslinked product exist the structures of linear isomer and four-membered ring isomer. The glass-transition temperatures of the self-crosslinked poly(silyl ester) was higher than that of the uncrosslinked poly(silyl ester), and the thermal stability of the self-crosslinked poly(silyl ester) was better than that of uncrosslinked poly(silyl ester).

The Experimental Research on the Thermal Properties of Shape-Stabilized Phase Change Materials

2013 ◽  
Vol 291-294 ◽  
pp. 1159-1163
Author(s):  
Quan Ying Yan ◽  
Li Hang Yue ◽  
Li Li Jin ◽  
Ran Huo ◽  
Lin Zhang
Keyword(s):  
Thermal Stability ◽  
Fatty Acid ◽  
Phase Change ◽  
Phase Change Materials ◽  
Liquid Paraffin ◽  
Capric Acid ◽  
Good Thermal Stability ◽  
Change Material ◽  
Thermal Stability Of ◽  
Better Than

This paper investigated the thermal performance of shape stabilized phase change paraffin and shape-stabilized phase change fatty acid. And the PCMs are mixtures of 60% 46# paraffin and 40% liquid paraffin, 65 % 48# paraffin and 35% liquid paraffin,30%capric acid and 70% lauric acid, 30%capric acid and 70% myristic acid. Support material is high-density polyethylene. The results in this paper show that: Thermal stability of both of the two types of phase change materials are good, thermal stability of shape stabilized phase change fatty acid is better than that of paraffin. Results in this paper can provide references and basis for the application of phase change material walls in the practice building.

Preparation and Characterization of Nano-Ni/B Composite Particles

2012 ◽  
Vol 602-604 ◽  
pp. 197-200
Author(s):  
Yong Qi Wei ◽  
Xin Chen ◽  
Ai Jun Han ◽  
Ming Quan Ye
Keyword(s):  
Average Diameter ◽  
Exothermic Peak ◽  
Composite Particles ◽  
X Ray Diffraction ◽  
Boron Powder ◽  
Boron Particle ◽  
Thermal Chemistry ◽  
Thermal Stability Of ◽  
Better Than

The synthesis of nano-Ni/B composite particles was studied by diamine hydrate reducing nikel chloride in the water bath at 50 °C, in which nano-Ni was made to cover the surface of micron boron powder. The particle size, the structure and properities of the nano-Ni/B composite particles were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). And the thermal stability of nano-Ni/B composite particles was studied by employing thermogravimetry (TG), differential thermal analysis (DTA). The results showed that this method could prepare the compact coating for Ni/B particles. The nano-Ni particles coated on boron particle were uniform and continuous. The average diameter of Ni crystallites was about 21.7 nm. Compared with boron powders, the high temperature of exothermic peak of nano-Ni/B composite particles was decreased about 36 °C. The thermal chemistry behavior of the as-prepared nano-Ni/B composite particles was better than superfine boron powders.

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