Effects of ammonium chloride and heat treatment on residual formaldehyde contents of melamine-formaldehyde microcapsules

Li, Wei; Wang, Jianping; Wang, Xuechen; Wu, Shizhen

doi:10.1007/s00396-007-1744-3

Cited by 55 publications

(29 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The 810 cm -1 peaks, they pertain to characteristic triazine bending, while the ones at 715 cm -1 range imply in-plane rocking vibration of the methylene group. The presence of these peaks in all FTIR spectra confirms that n-octadecane is successfully microencapsulated into the UMF polymer shell [11], [12]. Moreover, there are also broad peaks at around 3390 cm -1 that are overlapped by the imino and amino stretching peaks, and those peaks correspond to phenolic hydroxyl stretching vibrations.…”

Section: A Ftir and Sem Analysis Of Mepcmsmentioning

confidence: 63%

Characterization of MEPCM-Incorporated Paint as Latent Heat Storage System

Tumolva¹,

Sabarillo²

2017

IJCEA

View full text Add to dashboard Cite

Abstract-This study aimed to determine the effect of the mixing speed and pre-polymer dropping rate during synthesis of microencapsulated phase change materials (MEPCMs), and to assess the performance of MEPCM-incorporated paint as a latent heat storage (LHS) system. N-octadecane as phase change material was encapsulated with resorcinol-modified ureamelamine-formaldehyde at two different mixing speeds and four different pre-polymer dropping rates, and Fourier transform infrared (FTIR) spectroscopy was done to confirm success of microencapsulation. Scanning electron microscopy (SEM) revealed that increasing the homogenization speed and decreasing the pre-polymer dropping rate decreases the microcapsule size. Differential scanning calorimetry results showed that latent heat and encapsulation ratio increases with increasing mixing speed and decreasing pre-polymer dropping rate. The synthesized MEPCMs were incorporated into white paint at three different concentrations, and temperature profiling revealed that the paint's temperature buffering capacity generally increases with increasing mixing speed, decreasing pre-polymer dropping rate and increasing MEPCM concentration.Index Terms-Heat storage, MEPCM, phase change material, microencapsulation.

show abstract

Section: A Ftir and Sem Analysis Of Mepcmsmentioning

confidence: 63%

Characterization of MEPCM-Incorporated Paint as Latent Heat Storage System

Tumolva¹,

Sabarillo²

2017

IJCEA

View full text Add to dashboard Cite

show abstract

“…This result indicates that the copolymer shell can prohibit the paraffin from losing mass too quickly with increasing temperature. 36,37 In addition, it can be found that T 0.05 of the crosslinked paraffin microcapsules was increased by 7 C as compared with the uncrosslinked paraffin microcapsules. Furthermore, in the case of the core containing paraffin and DEEP, the T 0.05 of the crosslinked microcapsules was remarkably enhanced by 18 C in comparison with their uncrosslinked counterpart.…”

Section: Phase Change Properties and Thermal Stabilities Of Microcapsmentioning

confidence: 93%

Preparation and characterization of flame retardant phase change materials by microencapsulated paraffin and diethyl ethylphosphonate with poly(methacrylic acid‐co‐ethyl methacrylate) shell

Qiu

Chen

2015

J of Applied Polymer Sci

View full text Add to dashboard Cite

Microcapsules containing paraffin and diethyl ethylphosphonate (DEEP) flame retardant with uncrosslinked and crosslinked poly (methacrylic acid-co-ethyl methacrylate) (P(MAA-co-EMA)) shell were fabricated by suspension-like polymerization. The surface morphologies of the microencapsulated phase change materials (microPCMs) were studied by scanning electron microscopy. The thermal properties and thermal stabilities of the microPCMs were investigated by differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). The flame retarding performances of the microcapsule-treated foams were calculated by using an oxygen index instrument. The DSC results showed that the crosslinking of the polymer shell led to an increase in the melting enthalpies of the microcapsule by more than 15%. The crosslinked P(MAA-co-EMA) microcapsules with DEEP and without DEEP have melting enthalpies of 67.2 and 102.9 J/g, respectively. The TGA results indicated that the thermal resistant temperature of the crosslinked microcapsules with DEEP was up to 171 C, which was higher than that of its uncrosslinked counterpart by 20 C. The incorporation of DEEP into the microPCM increased the limiting oxygen index value of the microcapsule-treated foams by over 5%. Thermal images showed that both microcapsule-treated foams with and without DEEP possessed favorably temperature-regulated properties. As a result, the microPCMs with paraffin and DEEP as core and P(MAA-co-EMA) as shell have good thermal energy storage and thermal regulation potentials, such as thermal-regulated foams heat insulation materials.

show abstract

“…For geometric model of MPCMs, the shell thickness of microcapsule was calculated using the following equation [27].…”

Section: Calculation Of Thickness Of Encapsulating Shellmentioning

confidence: 99%

FE analysis of thermal properties of woven fabric constructed by yarn incorporated with microencapsulated phase change materials

et al. 2015

View full text Add to dashboard Cite

Phase Change Materials are the substances which can store or release a large amount of energy in the form of latent heat at certain melting temperatures. Such properties open new opportunities in the development of thermo-regulating textiles for thermal protection against extreme environment. In this work, a woven fabric has been made using a novel synthetic yarn incorporated with Microencapsulated Phase Change Materials and its heat transfer property has been studied using finite element analysis. The result of simulation after post processing has been validated against experimental result. It shows a strong correlation between the predicted and experimental results. Based on validated model, delay in temperature rise as a function of time is also predicted which is not possible to be determined through experiment.

show abstract

Effects of ammonium chloride and heat treatment on residual formaldehyde contents of melamine-formaldehyde microcapsules

Cited by 55 publications

References 22 publications

Characterization of MEPCM-Incorporated Paint as Latent Heat Storage System

Characterization of MEPCM-Incorporated Paint as Latent Heat Storage System

Preparation and characterization of flame retardant phase change materials by microencapsulated paraffin and diethyl ethylphosphonate with poly(methacrylic acid‐co‐ethyl methacrylate) shell

FE analysis of thermal properties of woven fabric constructed by yarn incorporated with microencapsulated phase change materials

Contact Info

Product

Resources

About