Fungal Resistance of Loblolly Pine Reacted with Methyl or Phenyl Isothiocyanate

Chen, George C.

doi:10.1515/hfsg.1992.46.1.77

Cited by 8 publications

(5 citation statements)

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“…This was attributed to the lability of the sulfonate ester bond, which was hydrolyzed readily during fungal degradation. A similar result from a previous study showed that wood reacted with tosyl Chloride lost 23 % of the sulfonate ester groups during the 12-week decay test (Chen 1992b). Less chemical was lost from wood reacted with epichlorohydrin than from wood crosslinked with chlorosulfonyl isocyanate during the same 12-week decay test.…”

Section: Decay Resistancesupporting

confidence: 83%

Fungal Decay Resistance of Wood Reacted with Chlorosulfonyl Isocyanate or Epichlorohydrin

Chen¹

1994

HFSG

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We are searching for chemical treatments that can cross-link with wood causing minimal damage to mechanical properties while also improving decay resistance. The objective of this study was to investigate the reactions between wood and Chlorosulfonyl isocyanate or epichlorohydrin and to determine fungal resistance of the treated wood. Loblolly pine (Pinus taeda L.) reacted with Chlorosulfonyl isocyanate to 6.1% weight gain of chemical and epichlorohydrin to 10.9% weight gain of chemical had 1.3% and 2.3% weight loss, respectively, by the fungus Gloeophyllum trabeum. Wood cross-linked with Chlorosulfonyl isocyanate lost 50% of the sulfonyl carbamoyl groups in the decay test, whereas wood reacted with epichlorohydrin lost 17 % of the alkoxy-bonded product; the loss from the cross-linked product was not determined. Cross-linking between wood and Chlorosulfonyl isocyanate was evidenced by the characteristic sulfonate and carbamate infrared absorptions. For wood reacted with epichlorohydrin, chemical analyses showed that 50 % of the bond between epichlorohydrin and wood was alkoxy-bonded wood and the remaining 50 % was mainly cross-linked with wood.

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Section: Decay Resistancesupporting

confidence: 83%

Fungal Decay Resistance of Wood Reacted with Chlorosulfonyl Isocyanate or Epichlorohydrin

Chen¹

1994

HFSG

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“…Ağırlık kayıpları %20'nin üstünde olduğu için yapılan çürüklük testi EN 113 standardına [28] göre başarılı sayılmıştır. 0 10 20 30 40 50 60 70 80 2s 24s 48s 72s 144s 192s 240s 312s 336s 2s 24s 48s 72s 144s 192s 240s 312s 336s 2s 24s 48s 72s 144s 192s 240s 312s [39]. Diğer iki grupta, reaksiyon süresi arttıkça ağırlık kayıpları azalmıştır.…”

Section: Bulgular Ve Tartişma (Results and Discussion)unclassified

Ki̇myasal Modi̇fi̇kasyonun Odunda Su Alma, Boyutsal Kararlilik Ve Bi̇yoloji̇k Dayanima Etki̇si̇

Tomak¹,

Temiz²

2014

Gazi Üniversitesi Mühendislik-Mimarlık Fakültesi Dergisi

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ÖZETBu çalışmada, asetik, fitalik ve propiyonik anhidritler ile modifikasyon işlemine tabi tutulan odunun su alma oranı, boyutsal kararlılık ve mantar çürüklüğüne karşı performansı araştırılmıştır. Bu amaçla sarıçam odunu (Pinus sylvestris L.) örnekleri anhidritler ile muamele sonrası 2, 4 ve 8 saat boyunca 120°C'de reaksiyona tabi tutulmuşlardır. Örneklerin kimyasal yapısındaki değişimler FT-IR ile, su alma oranı ve boyutsal kararlılıkları 14 gün boyunca yapılan ağırlık ve boyut ölçümleri ile, mantar çürüklüğüne karşı dayanımı ise bir esmer çürüklük mantarı olan Coniophora puteana'ya 3 ay maruz bırakılmasıyla belirlenmiştir. Mantar çürüklük testinde yıkanmış ve yıkanmamış örnekler kullanılmıştır. Elde edilen bulgulara göre; anhidritler ile modifiye edilen örneklerin su alma oranı kontrol örneklerine kıyasla oldukça düşük bulunmuştur. Boyutsal kararlılık bakımından en iyi sonuçlar sırasıyla propiyonik, asetik ve fitalik anhidritler ile elde edilmiştir. Mantar çürüklük testi öncesi yıkanma işlemine tabi tutulan ve tutulmayan kontrol örneklerinde C. puteana saldırısı sonrasında ağırlık kaybı sırasıyla %34 ve %37 bulunurken, anhidritler ile modifiye edilen ve çürüklük testi öncesi yıkanma işlemine tabi tutulmayan örneklerde ağırlık kaybı %0-2.1, yıkanma işlemine tabi tutulan örneklerde ise ağırlık kaybı %0.5-7.6 olarak bulunmuştur. Esmer çürüklük mantarına karşı dayanım açısından en iyi etkinlik propiyonik anhidritle modifikasyon işlemi sonrasında elde edilmiştir.Anahtar Kelimeler: Anhidrit, boyutsal kararlılık, FT-IR, kimyasal modifikasyon, mantar çürüklük EFFECT OF CHEMICAL MODIFICATION ON WATER ABSORPTION, DIMENSIONAL STABILITY AND BIOLOGICAL DURABILITY OF WOOD ABSTRACTIn this study, effect of chemical modification using with acetic, phthalic and propionic anhydrides on water absorption, dimensional stability and biological resistance of wood was studied. For this purpose, Scots pine (Pinus sylvestris L.) wood samples were treated with the anhydrides and heated at 120°C during 2, 4 and 8 hours after treatment. Chemical changes in wood were investigated with FT-IR. Dimensional stability and water absorption rates of samples were determined by weighting the samples and measuring the dimensions during 14 days in water submersion test. Decay test was performed using a brown rot fungus, Coniophora puteana for 3 months on both leached and unleached samples. According to results, water absorption rate of treated wood was lower than that of untreated controls. The best results for anti-shrink efficiency were found in propionic, acetic and phthalic anhydride treatments, respectively. The weight loss of samples exposed to C. puteana was found as 34% and 37% for unleached and leached controls, respectively. The weight loss values were in a range of 0-2.1% and 0.5-7.6% for unleached and leached modified samples, respectively. Propionic anhydride showed better decay resistance against decay fungus compared to other anhydrates.

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“…Tosylation pre-treatment provides binding of tosyl groups to wood cell wall polymers (cellulose, hemicellulose, and lignin) thorough ester bonds (Chen 1991). This pre-treatment increases the hydrophobicity of wood by shielding hydroxyl groups and promotes further impregnation of hydrophobic molecules in the second step (Ermeydan et al 2012(Ermeydan et al , 2014.…”

Section: Wood Modification Processmentioning

confidence: 99%

A natural flavonoid, chrysin, improving wood properties via impregnation

Ermeydan

2019

BioRes

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A broader utilization of wood can be achieved by eliminating its drawbacks such as low dimensional stability with changing moisture content and low durability against various bio-organisms. Heartwood formation is nature’s solution that functions through biosynthesis and accumulation of some phenolic compounds in the cell walls, leading to more durable and stable wood. In this study, a natural flavonoid molecule, chrysin, was used to improve Scots pine wood properties. Hydrophobic chrysin was impregnated into wood after a pre-treatment. The chrysin modification reduced the water uptake of the wood cell walls by up to 33% and increased the dimensional stability of the Scots pine by up to 30%. Infrared spectroscopic analysis revealed the chemical characterization of the bio-inspired modification. In contrast to the many modification methods that establish covalent bonds between hydroxyl groups of wood polymers, chrysin was bulked into wood cell walls and stabilized by intermolecular interactions.

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Fungal Resistance of Loblolly Pine Reacted with Methyl or Phenyl Isothiocyanate

Cited by 8 publications

References 1 publication

Fungal Decay Resistance of Wood Reacted with Chlorosulfonyl Isocyanate or Epichlorohydrin

Fungal Decay Resistance of Wood Reacted with Chlorosulfonyl Isocyanate or Epichlorohydrin

Ki̇myasal Modi̇fi̇kasyonun Odunda Su Alma, Boyutsal Kararlilik Ve Bi̇yoloji̇k Dayanima Etki̇si̇

A natural flavonoid, chrysin, improving wood properties via impregnation

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