Preparation of a novel melamine foam structure and properties

2021 ◽  
pp. 51992
Author(s):  
Chao Yan ◽  
Ye‐Jun Luo ◽  
Wen‐Ge Zhang ◽  
Zi‐Fan Zhu ◽  
Pei‐Ying Li ◽  
...  
Keyword(s):  
Structure And Properties ◽  
Foam Structure ◽  
Melamine Foam

Thermosetting polyester foams by infiltration in soluble preforms

2017 ◽  
Vol 54 (4) ◽  
pp. 707-718 ◽  
Author(s):  
Fabrizio Quadrini ◽  
Carmine Lucignano ◽  
Loredana Santo
Keyword(s):  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Unsaturated Polyester Resin ◽  
Structure And Properties ◽  
Compression Tests ◽  
Foam Structure ◽  
Cyclic Compression ◽  
Foam Properties

Rigid thermosetting foams are produced by infiltration of an unsaturated polyester resin into a soluble preform. In the experimentation, preforms were made of carbamide particles which were compacted at different values of pressure to change the foam structure and properties. After resin polymerization, carbamide particles are evacuated by immersion in water, leaving pores into the samples. Foams with porosity ranging from 52% to 77% were obtained as a function of the preform density. Quasi-static and cyclic compression tests were performed to evaluate foam properties. By increasing porosity, the foam strength reduces as well as the energy adsorbed at failure, and the energy lost in each single loading–unloading cycle.

Effect of Compound Formulation and Processing Conditions on Properties of Extruded EPDM and NR/EPDM Foams

2003 ◽  
Vol 22 (1) ◽  
pp. 43-56 ◽  
Author(s):  
C. Lewis ◽  
Y. Rodlum ◽  
B. Misaen ◽  
S. Changchum ◽  
G.L.A. Sims
Keyword(s):  
Cell Structure ◽  
Decomposition Temperature ◽  
Processing Conditions ◽  
Structure And Properties ◽  
Foam Structure ◽  
Blowing Agent ◽  
Hot Air ◽  
Roll Mill ◽  
Type Composition ◽  
Extended Work

The effects of compound formulations and processing conditions on the structure and properties of extruded EPDM and EPDM/NR blends of tube foams were investigated. The foam tubes were prepared by mixing a compound in a two roll mill, extruding the compound through a cold feed extruder and finally vulcanizing the extrudate in a circulating hot air oven. In previous results, the EPDM grade, blowing agent type, composition of EPDM blend and processing conditions were found to affect the cell structure and the physical properties of the resultant EPDM foams. An extended work was carried out using blowing agent blends and NR blending with EPDM as a based rubber. The characteristics of blowing agent blends (ADC/DNPT) were studied using a gas evolution apparatus. Decomposition temperature of ADC decreased with both DNPT and OBSH blending which affected the resultant EPDM foams structure and properties. To promote the use of natural rubber, its various compositions were blended with EPDM to produce the foam tubes. Modified formulations were needed to ease the difficulty of mixing and stabilising the resultant foams. Using a tube mold for an extrudate as an alternative technique to vulcanize the NR/EPDM extrudate in the hot air oven was successfully found to control the expansion and foam dimensions. The NR compositions were also found to affect the foam structure and properties.

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