Improving Thermal Performance of High Internal Phase Emulsion Polymerized Foams with Maleimide Based Monomers

1996 ◽  
Vol 431 ◽  
Author(s):  
Mark A. Hoisington ◽  
Joseph R. Duke ◽  
David A. Langlois
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermal Performance ◽  
Foam Glass ◽  
Polymerization Process ◽  
High Internal Phase Emulsion ◽  
Internal Phase

AbstractThe influence of three N-substituted maleimides on the thermal performance of high internal phase emulsion (HIPE) polymerized foams were investigated. N-propylmaleimide, Nbutylmaleimide, and N-cyclohexylmaleimide were copolymerized with styrene and crosslinked with either divinylbenzene or Bis(3-ethyl-5-methyl-4-maleimide-phenyl)methane in a HIPE polymerization process. All maleimide modifiers produced increases in the foam glass transition temperature (Tg) as a function of the maleimide concentration. The degree of Tg improvement was strongly dependent on the N-substituted maleimide used during processing.

Natural glycyrrhizic acid: improving stress relaxation rate and glass transition temperature simultaneously in epoxy vitrimers

2021 ◽  
Author(s):  
Jianqiao Wu ◽  
Liang Gao ◽  
Zhongkai Guo ◽  
Hao Zhang ◽  
Baoyan Zhang ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Stress Relaxation ◽  
Relaxation Rate ◽  
Thermal Performance ◽  
Glycyrrhizic Acid

Epoxy vitrimers based on transesterification reactions (TERs) is a kind of recyclable thermosets which have been developed prosperously in recent years. However, the good thermal performance and the quick network...

The Modification of Butadiene-Acrylonitrile Rubber with Vinylcyclohexyl Ketone

2002 ◽  
Vol 75 (4) ◽  
pp. 683-690
Author(s):  
Niyazi Şahidoğlu Resulov ◽  
Bekir Sari ◽  
Muzaffer Talu
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Mechanical Tests ◽  
Polymerization Process ◽  
Adhesive Properties ◽  
Initial Concentration ◽  
Good Adhesive ◽  
The Media ◽  
Trans Structure

Abstract Butadiene-acrylonitrile-vinylcyclohexyl ketone (BD-AN-VCHK) terpolymer was synthesized by radical polymerization. The structure of the synthesized terpolymer was elucidated by IR spectroscopy and physical and mechanical tests. BD-AN-VCHK terpolymer was stable at lower temperatures and exhibited good adhesive properties. It was also observed that the yield of terpolymer was dependent upon the initial concentration of VCHK and pH of the media. The percentage of conversion increased by increasing the initial concentration of VCHK. With addition of 10.8% VCHK to the BD-AN mixture, the glass transition temperature (Tg) value of the polymers decreased from −40 °C to −57 °C. However further increase of VCHK ratio (20.4%) resulted in the formation of the polymers with Tg value of −48 °C. It was shown that this was due to the fact that VCHK, entering the structure during polymerization process, converted the trans structure of butadiene sequences into the cis form.

A Novel Poly(Ionic Liquid) as the Thermal Insulating Material

2020 ◽  
Vol 13 (3) ◽  
pp. 241-247
Author(s):  
Wenxin Wei ◽  
Guifeng Ma ◽  
Hongtao Wang ◽  
Jun Li
Keyword(s):  
Thermal Conductivity ◽  
Ionic Liquid ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Flame Resistance ◽  
Insulating Material ◽  
Low Thermal Conductivity ◽  
Thermal Insulating ◽  
Poly Ionic Liquid

Objective: A new poly(ionic liquid)(PIL), poly(p-vinylbenzyltriphenylphosphine hexafluorophosphate) (P[VBTPP][PF6]), was synthesized by quaternization, anion exchange reaction, and free radical polymerization. Then a series of the PIL were synthesized at different conditions. Methods: The specific heat capacity, glass-transition temperature and melting temperature of the synthesized PILs were measured by differential scanning calorimeter. The thermal conductivities of the PILs were measured by the laser flash analysis method. Results: Results showed that, under optimized synthesis conditions, P[VBTPP][PF6] as the thermal insulator had a high glass-transition temperature of 210.1°C, high melting point of 421.6°C, and a low thermal conductivity of 0.0920 W m-1 K-1 at 40.0°C (it was 0.105 W m-1 K-1 even at 180.0°C). The foamed sample exhibited much low thermal conductivity λ=0.0340 W m-1 K-1 at room temperature, which was comparable to a commercial polyurethane thermal insulating material although the latter had a much lower density. Conclusion: In addition, mixing the P[VBTPP][PF6] sample into polypropylene could obviously increase the Oxygen Index, revealing its efficient flame resistance. Therefore, P[VBTPP][PF6] is a potential thermal insulating material.

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