Special Issue "Thermal Insulating and Fire-Resistant Polymer Composites"

A special issue of Polymers (ISSN 2073-4360).

Deadline for manuscript submissions: 25 June 2019

Special Issue Editor

Guest Editor
Prof. Jingliang Li

Institute for Frontier Materials, Deakin University, Geelong, Australia
Website | E-Mail
Interests: polymer composites; natural fibers; supramolecular materials and nanomaterials

Special Issue Information

Dear Colleagues,

Polymeric materials have the advantages of being lightweight and have low thermal conductivity; hence, they are good for thermal insulation applications. However, their mechanical strength and fire-resistance are inferior to those of inorganic materials. Enforcing polymeric materials (e.g., foams) with fillers, such as particles, is a convenient approach to produce composite materials with improved mechanical properties. The fillers could also improve the thermal insulating and fire-resistance properties of the materials, which promotes the applications of polymeric materials many sectors such as buildings and aerospace. This Special Issue aims to gather the recent advances in this field. Both review and research articles are welcome. While synthetic polymers are suitable, special interest will be on natural polymers. In general, the processes for producing polymers from natural resources are greener than those for the synthetic ones. In addition, the use of natural polymer composites in various application does not impose significant hazards to human beings and the environment. Hence, they are more environmentally friendly and sustainable.

Associate Prof. Jingliang Li
Guest Editor

Manuscript Submission Information

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Keywords

  • Polymer
  • Composite
  • Nanocomposite
  • Thermal insulation
  • Fire resistance

Published Papers (3 papers)

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Research

Open AccessArticle
Preparation and Characteristics of an Environmentally Friendly Hyperbranched Flame-Retardant Polyurethane Hybrid Containing Nitrogen, Phosphorus, and Silicon
Polymers 2019, 11(4), 720; https://doi.org/10.3390/polym11040720
Received: 15 March 2019 / Revised: 11 April 2019 / Accepted: 13 April 2019 / Published: 19 April 2019
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Abstract
The NCO functional group of 3-isocyanatoproplytriethoxysilane (IPTS) and the OH functional group of 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phospha-phenantbrene-10-oxide (DOPO-BQ) were used to conduct an addition reaction. Following completion of the reaction, triglycidyl isocyanurate (TGIC) was introduced to conduct a ring-opening reaction. Subsequently, a sol–gel method was used [...] Read more.
The NCO functional group of 3-isocyanatoproplytriethoxysilane (IPTS) and the OH functional group of 10-(2,5-dihydroxyphenyl)-10H-9-oxa-10-phospha-phenantbrene-10-oxide (DOPO-BQ) were used to conduct an addition reaction. Following completion of the reaction, triglycidyl isocyanurate (TGIC) was introduced to conduct a ring-opening reaction. Subsequently, a sol–gel method was used to initiate a hydrolysis–condensation reaction on TGIC–IPTS–DOPO-BQ to form a hyperbranched nitrogen–phosphorous–silicon (HBNPSi) flame retardant. This flame retardant was incorporated into a polyurethane (PU) matrix to prepare a hybrid material. Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), limiting oxygen index (LOI), UV-VIS spectrophotometry, and Raman analysis were conducted to characterize the structure and analyze the transparency, thermal stability, flame retardancy, and residual char to understand the flame retardant mechanism of the prepared hybrid material. After the flame retardant was added, the maximum degradation rate decreased from −36 to −17 wt.%/min, the integral procedural decomposition temperature (IPDT) increased from 348 to 488 °C, and the char yield increased from 0.7 to 8.1 wt.%. The aforementioned results verified that the thermal stability of PU can be improved after adding HBNPSi. The LOI analysis indicated that the pristine PU was flammable because the LOI of pristine PU was only 19. When the content of added HBNPSi was 40%, the LOI value was 26; thus the PU hybrid became nonflammable. Full article
(This article belongs to the Special Issue Thermal Insulating and Fire-Resistant Polymer Composites)
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Graphical abstract

Open AccessArticle
Density Effect on Flame Retardancy, Thermal Degradation, and Combustibility of Rigid Polyurethane Foam Modified by Expandable Graphite or Ammonium Polyphosphate
Polymers 2019, 11(4), 668; https://doi.org/10.3390/polym11040668
Received: 19 March 2019 / Revised: 8 April 2019 / Accepted: 8 April 2019 / Published: 11 April 2019
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Abstract
The current study aims at comparatively investigating the effect of apparent density on flame retardancy, thermal degradation and combustion behaviors of rigid polyurethane foam (RPUF), RPUF/ expandable graphite (EG) and RPUF/ ammonium polyphosphate (APP). A series of RPUF, RPUF/EG and RPUF/APP samples with [...] Read more.
The current study aims at comparatively investigating the effect of apparent density on flame retardancy, thermal degradation and combustion behaviors of rigid polyurethane foam (RPUF), RPUF/ expandable graphite (EG) and RPUF/ ammonium polyphosphate (APP). A series of RPUF, RPUF/EG and RPUF/APP samples with different apparent densities (30, 60 and 90 kg/m3) were prepared. The flame retardancy, thermal degradation, and combustion behaviors of each sample were investigated. Limiting oxygen index (LOI) results indicated that increasing apparent density was beneficial to the flame retardancy of all foam systems. The effect of apparent density on the enhancement of flame retardancy followed the sequence of RPUF < RPUF/APP < RPUF/EG. Thermogravimetric analysis (TGA) results showed that an increase in the apparent density can cause more weight loss in the first degradation stage and less weight loss in the second degradation stage for all foam systems. The combustion behaviors also showed significant differences. The samples with a higher apparent density showed a longer duration of heat release and higher total heat release (THR). The findings in this study demonstrated that apparent density played an important role in flame retardancy, thermal degradation, and combustion behaviors of RPUF, which must be paid more attention in the studies of flame-retardant RPUF. Full article
(This article belongs to the Special Issue Thermal Insulating and Fire-Resistant Polymer Composites)
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Graphical abstract

Open AccessArticle
Construction of Carbon Microspheres-Based Silane Melamine Phosphate Hybrids for Flame Retardant Poly(ethylene Terephthalate)
Polymers 2019, 11(3), 545; https://doi.org/10.3390/polym11030545
Received: 25 February 2019 / Revised: 15 March 2019 / Accepted: 17 March 2019 / Published: 22 March 2019
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Abstract
To improve the flame retardancy and inhibit the smoke of poly(ethylene terephthalate) (PET), carbon microspheres (CMSs)-based melamine phosphate (MP) hybrids (MP-CMSs) were constructed in situ with the introduction of CMSs into the hydrothermal reaction system of MP. The integrated MP-CMSs were modified by [...] Read more.
To improve the flame retardancy and inhibit the smoke of poly(ethylene terephthalate) (PET), carbon microspheres (CMSs)-based melamine phosphate (MP) hybrids (MP-CMSs) were constructed in situ with the introduction of CMSs into the hydrothermal reaction system of MP. The integrated MP-CMSs were modified by 3-Aminopropyltriethoxysilane (APTS) to obtain the silane MP-CMSs (SiMP-CMSs) to strengthen the interface binding between the MP-CMSs and PET matrix. The results showed that the SiMP layer was loaded on the CMSs surface. The addition of only 3% SiMP-CMSs increased the limiting oxygen index (LOI) value of the PET from 21% ± 0.1% to 27.7% ± 0.3%, reaching a V-0 burning rate. The SiMP-CMSs not only reduced heat damage, but also inhibited the smoke release during PET combustion, whereupon the peak heat release rate (pk-HRR) reduced from 513.2 to 221.7 kW/m2, and the smoke parameters (SP) decreased from 229830.2 to 81892.3 kW/kg. The fire performance index (FPI) rose from 0.07 m2s/kW to 0.17 m2s/kW, demonstrating the lower fire risk. The proportion of the flame-retardant mode in the physical barrier, flame inhibition, and char effects were recorded as 44.53%, 19.04%, and 9.04%, respectively. Full article
(This article belongs to the Special Issue Thermal Insulating and Fire-Resistant Polymer Composites)
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Graphical abstract

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