Hydroxy‐terminated polybutadiene toughened epoxy resin: Chemical modification, microstructure, and impact strength

Soares, Vera; Ramos, Valéria D.; Rangel, George W. M.; Nascimento, Regina Sandra Veiga

doi:10.1002/adv.10012

Cited by 16 publications

(5 citation statements)

References 15 publications

(10 reference statements)

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“…Namun begitu penggunaan cecair getah didapati memberikan kepelbagaian dalam sifat komposit epoksi yang dihasilkan. Antara cecair getah yang digunakan secara meluas adalah LENR (Abu Bakar et al 2011;Ratim et al 2018), cecair ATBN (Kelnar et al 2020;Kim & Mai, 1991;Szymańska et al 2018), CTBN (Auad et al 2001;Vijayan P et al 2017), HTPB (Kou et al 2018;Ozturk et al 2001;Yi et al 2020), ETBN (Gouda et al 2017;Li et al 2017;Verchere et al 1991) dan akrilonitril (Neisiany et al 2018;Ozdemir et al 2016;Pereira Soares et al 2002) telah menunjukkan peningkatan dalam keliatan komposit epoksi yang terhasil.…”

Section: Pengenalanunclassified

Sifat Mekanikal Komposit Epoksi Montmorillonite Terawat Diperkukuh Cecair Getah Asli Terepoksida

Ku Ahmad,

Ahmad,

Rasid

2021

ZJDSET

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Kajian ini telah dijalankan dengan menghasilkan dua sistem komposit iaitu komposit epoksi berpengisi montmorillonite (MMT) dengan dan tanpa cecair getah asli terepoksida (LENR) secara kaedah pencampuran in situ. Komposit telah di pramatang pada tiga suhu iaitu pada suhu 30 C, 50 C atau 70 C . Kedua dua sistem dimatang pada suhu 130 C atau 140 C. Ujian hentaman Izod dan ujian keliatan patah ke atas komposit yang dihasilkan menunjukkan peningkatan maksimum sebanyak 44% dengan penambahan MMT dan 29% peningkatan dengan penambahan getah asli terepoksida. Selain kandungan MMT, suhu pra matang 70 C memberikan kesan yang ketara terhadap kekuatan hentaman dan keliatan patah sistem epoksi berpengisi MMT. Suhu pra-matang 50 C merupakan suhu yang optimum dan berupaya memberikan kekuatan hentaman dan keliatan patah yang baik kepada sistem epoksi berpengisi MMT getah asli terepoksida. Suhu matang bagi kedua dua sistem tidak memberikan kesan yang ketara kepada sifat mekanikal kedua dua sistem komposit ini. Pemeriksaan mikrostruktur melalui mikroskop elektron transmisi menunjukkan MMT tertabur dengan susunan interkalasi. Peningkatan kandungan MMT melebihi 1 % berat menunjukkan kehadiran taktoid dan penggumpalan silikat.

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Section: Pengenalanunclassified

Sifat Mekanikal Komposit Epoksi Montmorillonite Terawat Diperkukuh Cecair Getah Asli Terepoksida

Ku Ahmad,

Ahmad,

Rasid

2021

ZJDSET

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“…The results support the proposition that epoxy and ITPE react, forming urethane links, which are samely reported in the Refs. [6,7]. The ITPE is converted to epoxy as shown in Eq.…”

Section: Molecular Structure Of Er/itpsmentioning

confidence: 99%

“…However, the presence of the rubbery phase may decrease the modulus and the thermal stability of the material with an accompanying loss of properties at elevated temperatures. More recently, a chemical modification between bisphenol-A-based epoxy resins and liquid-elastomers, using tolylene diisocyanate (TDI) as a coupling agent, was described [6,7] .…”

Section: Introductionmentioning

confidence: 99%

Isocyanate-terminated polyethers toughened epoxy resin: Chemical modification, thermal properties, and mechanical strength

Cai

Wang

et al. 2007

J. Wuhan Univ. Technol.

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The toughening of the diglycidyl ether of bisphenol A epoxy resin with isocyanateterminated polyethers (ITPE) was investigated. The progress of the reaction and the structural changes during modifi cation process were studied using FTIR spectroscopy. The studies support the proposition that TDI (tolylene diisocyanate) acts as a coupling agent between the epoxy and polyethers, forming a urethane linkage with the former and the latter, respectively. Me THPA-cured ER/ITPs blends were characterized using dynamic mechanical analysis (DMA) and thermogravimetric analysis (TGA). It is indicated the glass transition temperature (T g ) of systems was lower than the T g of pure epoxy resin and overfull ITPE separated from the modifi ed epoxy resin and formed another phase at an ITPE-content of more than 10wt%. The thermal stability was decreased by the introduction of ITPE. The impact strength and the fl exural strength of the cured modifi edepoxy increased with increasing the ITPE content and a maximum plateau value of about 24.03 kJ/m 2 and 130.56 MPa was measured in 10wt% ITPE. From scanning electron microscopy (SEM) studies of the fractrue surfaces of ER/ITPE systems, the nature of the micromechanisms responsible for the increases in toughness of the systems was identifi ed.

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“…However, 10 wt% of CTPB was the optimum concentration beyond which a rapid fall of properties, in all cases, was observed. The toughening of the DGEBA with hydroxy-terminated polybutadiene (HTPB) was investigated by Soares et al [9]. A chemical link between the elastomer and the epoxy resin was promoted by employing tolylene diisocyanate (TDI).…”

Section: Introductionmentioning

confidence: 99%

Thermal and Morphological Properties of Chitosan Filled Epoxy

Satheesh

Tshai

Warrior

2014

AMM

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This paper investigates the effects of polysaccharide additive agent on the morphological and thermal properties of thermosetting polymer. The weight percentage (wt%) of Diglycidyl Ether of Bisphenol A (DGEBA) epoxy resin to Hexamethylenediamine (HMDA) hardener were kept constant while a varyingwt% of chitosan, ranging from 0 to 10wt% was introduced. The chitosan filled epoxy hardener mixture was allowed to cure at 40°C for a period of 12 hours. Dynamic Scanning Calorimetry (DSC) and Thermal Gravimetric Analysis (TGA) were conducted on the specimens to analyse the effects of chitosan loading on thermal stability and transition temperature while Atomic Force Microscopy (AFM) was used to investigate the changes to its morphological property. At chitosan loading of 2.5wt% and below, good dispersion of the additive was observed. Apparent agglomeration and phase separation were formed when chitosan content increases above 7.5wt%. The formation of bulky chitosan agglomeration was found capable of enhancing the thermal stability of the thermoset polymer. The diamine acted as the co-reactants with DGEBA as well as spacer which decrease the effect of material brittleness due to addition of chitosan.

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Hydroxy‐terminated polybutadiene toughened epoxy resin: Chemical modification, microstructure, and impact strength

Cited by 16 publications

References 15 publications

Sifat Mekanikal Komposit Epoksi Montmorillonite Terawat Diperkukuh Cecair Getah Asli Terepoksida

Sifat Mekanikal Komposit Epoksi Montmorillonite Terawat Diperkukuh Cecair Getah Asli Terepoksida

Isocyanate-terminated polyethers toughened epoxy resin: Chemical modification, thermal properties, and mechanical strength

Thermal and Morphological Properties of Chitosan Filled Epoxy

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