Processability and properties of phenoxy resin toughened phenolic resin composites

Wu, Hui‐Chun; Chen‐Chi, M.; Lin, Jia‐Min

doi:10.1002/(sici)1097-4628(19970214)63:7<911::aid-app11>3.0.co;2-u

Cited by 27 publications

(3 citation statements)

References 1 publication

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“…Therefore, under the effect of mixed tertiary amine catalyst and the phenolic hydroxyl, ESO can not form long flexible chain prepolymer by self-polymerization, but graft with phenolic resin prepolymer to give etherified phenolic resin [8]. But the reaction between ESO molecules and multi-amine can form chain extension polymer and crosslinking structure, whose main mechanism is that the reactive hydrogen atoms in primary amine of the mixed multi-amine react with epoxide group to produce secondary amine and subsequently give tertiary amine.…”

Section: Modification Methods Of Phenolic Resin With Esomentioning

confidence: 99%

Synthesis and application of phenolic resin internally toughened by chain extension polymer of epoxidized soybean oil

Situ

Huang

et al. 2008

Front. Chem. China

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A novel epoxidized soybean oil (ESO) internally toughened phenolic resin(ESO-IT-PR) with both good toughness and excellent thermal stability was prepared as the matrix resin of copper clad laminate (CCL). FTIR was adopted to investigate the molecular structure of modified phenolic resins and SEM was used to observe the micro morphology of their impacted intersections. The properties of CCLs prepared with these modified phenolic resins were studied to determine the optimal process and investigate the toughening mechanism. The main modifying mechanism is the etherification reaction between phenol hydroxyl and ESO catalyzed by triethanolamine and the chain extension polymerization between ESO and multi-amine gives the long-chain ESO epoxy grafting on the phenolic resin prepolymer. when the ESO content is 30% and the curing agent content is 7%, the ESO toughened phenolic resin possesses optimal performance. The flexible ESO epoxy shows significant toughening effect and it crosslinks with the phenolic resin to form an internally toughened network, which is the key factor for improving the solderleaching resistance of CCL prepared with this modified phenolic resin.

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Section: Modification Methods Of Phenolic Resin With Esomentioning

confidence: 99%

Synthesis and application of phenolic resin internally toughened by chain extension polymer of epoxidized soybean oil

Situ

Huang

et al. 2008

Front. Chem. China

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“…Fig.1 displays more information about above three resins. In the absorption region of 3 600-3 000 cm -1 , there are a wide peak at 3 342 cm -1 and a shoulder peak at 3 528 cm -1 (free hydroxyl group) that represents a stretching vibration of hydroxyl group in PR (hydrogen-bonded hydroxyl group), and indicates that there are great quantities of hydrogen-bonded hydroxyl group and free hydroxyl group in the PR [21] . In curves 1 and 2, the peaks of free hydroxyl had disappeared completely and the absorption band sites of hydrogen-bonded hydroxyls had shifted to the direction of higher frequency.…”

Section: Measurementsmentioning

confidence: 99%

Synthesis and properties of novel epoxidized soybean oilmodified phenolic resin/montmorillonite nanocomposites

Situ

et al. 2008

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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The novel epoxidized soybean oil-modifi ed-phenolic resin/clay nanocomposites(ESO-M-PR/ CN) was prepared. The coupling agent-benzyldimethylphenylammonium chloride [C 6 H 5 CH 2 N + (CH 3 ) 2 C 6 H 5 Cl -, B2MP] was adopted to modify the interface between the organic and inorganic phases. The effect of the nanocomposite structure on its physical and chemical properties was discussed. During the synthesizing process of ESO-M-PR/CN, the phenol hydroxyl was etherified by ESO or ESO epoxy resin prepolymer to provide long ESO epoxy segments. Long ESO epoxy resin chain segments enhanced the crosslink density of ESO-M-PR/CN. The thermal and mechanical properties exhibit a signifi cant improvement. The temperature at which a weight loss of 5% occurs increases from 287.1 ℃ to 402.3 ℃. The fl exural strength increases by 25%, while the fl exural modulus increases by 39%. Moreover, the properties of resin were enhanced by the effect of the inorganic nanoparticles, while the size of the nanomontmorillonites in the phenolic resin was characterized with a scanning electron microscope. The particle size of inorganic montmorillonites in the modifi ed system is less than 100 nm.

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“…9 Most of the reported studies on improving the properties of PF resin are aimed at toughening of the cured resin. [15][16][17][18][19][20][21] However, only a limited number of studies have been reported on microvoid reduction in cured phenolic resin. 10,22 Glycols and some dicarboxylic acids are effective in enhancing the mechanical properties of phenolic resin.…”

Section: Introductionmentioning

confidence: 99%

Control of microvoids in resol phenolic resin using unsaturated polyester

Parameswaran

Bhuvaneswary

Thachil

2009

J of Applied Polymer Sci

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A major drawback of cured phenol formaldehyde resin is the presence of microvoids, resulting from the liberation of condensation byproducts. In an attempt to rectify this, phenolic resol resin was blended with unsaturated polyester (UP). UPs with various maleic anhydride (MA) to phthalic anhydride (PA) ratios were synthesized and later mixed with resol resin in various proportions. The best MA/PA ratio was found out by determining the specific gravity, acetone-soluble matter, and volatile content of the cast blend, cured under a satisfactory time-temperature schedule. The influence of acid value of the UP and the most desirable UP content were also investigated on the basis of the quality of the modified phenolic samples. The structural changes in the modified resin were studied using FTIR spectroscopy. Scanning electron micrographs (SEM) of the fractured surfaces were obtained to ascertain the extent of microvoids in the modified resin. Both thermogravimetric analysis results and SEM micrographs confirm the effectiveness of UP in reducing the microvoids in the cast resol resin. The tensile and impact strengths of the samples also reflect the superior quality of the resol phenolic resins that have been modified by UP.

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Processability and properties of phenoxy resin toughened phenolic resin composites

Cited by 27 publications

References 1 publication

Synthesis and application of phenolic resin internally toughened by chain extension polymer of epoxidized soybean oil

Synthesis and application of phenolic resin internally toughened by chain extension polymer of epoxidized soybean oil

Synthesis and properties of novel epoxidized soybean oilmodified phenolic resin/montmorillonite nanocomposites

Control of microvoids in resol phenolic resin using unsaturated polyester

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