The Research of the Phase Change Materials Enclosed by β-CD

2011 ◽  
Vol 374-377 ◽  
pp. 352-356
Author(s):  
Sheng Jun Fu ◽  
Bo Liu ◽  
Wu Biao Duan ◽  
Jin Chang

This paper demonstrates that β-CD which encloses industrialized paraffin, one of the phase change materials, is utilized to prevent the leak of the paraffin. The enthalpy of the phase change materials which are enclosed is studied by characterizing of DSC. The result shows that the enthalpy of paraffin which has been enclosed by β-CD is increased by 29%. The related research contents had not been reported in literature. This method, compared with the common encapsulation of paraffin by wall materials, like the urea formaldehyde resin, not only is a new exploration on the enclosure method and the increasing of the enthalpy of the phase change materials, but also meets the requirement of enviromental protection.

2013 ◽  
Vol 815 ◽  
pp. 367-370 ◽  
Author(s):  
Xiao Qiu Song ◽  
Yue Xia Li ◽  
Jing Wen Wang

Hexadecane microcapsule phase change materials were prepared by the in-situ polymerization method using hexadecane as core materials, urea-formaldehyde resin and urea-formaldehyde resin modified with melamine as shell materials respectively. Effect of melamine on the properties of microcapsules was studied by FTIR, biomicroscopy (UBM), TGA and HPLC. The influences of system concentration, agitation speed and mass ratio of wall to core were also investigated. The results indicated that hexadecane was successfully coated by the two types of shell materials. The addition of melamine into the urea-formaldehyde resin microcapsule reduced microcapsule particle size and microencapsulation efficiency. The influences of factors such as system concentration, agitation speed and mass ratio of wall to core to different wall materials microcapsules presented different variety trends of the microcapsule particle size.


Buildings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 228
Author(s):  
Edgars Kirilovs ◽  
Inga Zotova ◽  
Staņislavs Gendelis ◽  
Hans Jörg-Gusovius ◽  
Silvija Kukle ◽  
...  

Phase change materials (PCMs) are now widely known as potential additives for building insulation materials to provide a thermal mass effect that helps conserve energy and maintain a comfortable indoor temperature. Therefore, the study presented in this paper focuses on an experimental investigation of the specific heat capacity and thermal conductivity of hemp shive mixed with PCMs. Industrially manufactured organic PCM-S50 received from MikroCaps Ltd. (Slovenia) has been used to further enhance respective properties of the product samples. The experimental boards were made from hemp shive by directly mixing 5% encapsulate PCMs into the mass. Cold pressing was used to manufacture the boards with Kleiberit urea formaldehyde resin glue as a binding agent. The experimental boards were made as 25 mm thick single-layer parts with a density of 300 ± 20 kg/m3, which qualify them as low-density boards. By adding nanocapsules during the board manufacturing process, the heat capacity is increased by 62%. Based on the great potential of using latent heat, it becomes a possible solution for the development of new technologies related to the automatic regulation of an indoor microclimate.


2015 ◽  
Vol 727-728 ◽  
pp. 141-144
Author(s):  
Xiao Qiu Song ◽  
Yu Ping Duan ◽  
Yue Xia Li

N-octadecane microcapsules phase change materials(MicroPCMs) were prepared by thein-situ polymerization method using n-octadecane as core materials, urea-formaldehyde resin as shellmaterials respectively. Melamine–formaldehyde (MF) microcapsules have been widely applied inmany functional materials. Free formaldehyde content are important safetyfactor determining the survival of the microcapsules during fabrication andapplication. In this study, the formaldehyde content of n-octadecane MicroPCMs decrease to 0.35g/Kg which even lower than the standard EuropeanE3 level (0.6g/Kg) through regulation the synthesis conditions such as urea/formaldehyderatio of weight from 1:2 to 1:1.6, urea batch feeding three times ,curing endpH value to 1.0-1.5,reactive time extend to 4h,addition melamine and PVA.


Author(s):  
Shanfeng Xu ◽  
Sanshan Xia ◽  
Yuzhu Chen ◽  
Hui Xiao ◽  
Maoyu Yi ◽  
...  

RSC Advances ◽  
2021 ◽  
Vol 11 (40) ◽  
pp. 25010-25017
Author(s):  
Li Lu ◽  
Yan Wang ◽  
Tianhua Li ◽  
Supeng Wang ◽  
Shoulu Yang ◽  
...  

Reactions between CaCO3 and CH2O2 during polycondensation of UF resin produce Ca2+. Ionic bond complexation binds Ca2+ with UF resin. The UF resin crystalline percentage decreases from 26.86% to 22.71%. IB strength of resin bonded fiberboard increases from 0.75 to 0.94 MPa.


2018 ◽  
Vol 136 (17) ◽  
pp. 47389 ◽  
Author(s):  
Ana Maria Ferreira ◽  
João Pereira ◽  
Margarida Almeida ◽  
João Ferra ◽  
Nádia Paiva ◽  
...  

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