Thermal Degradation of Wood Treated with Fire Retardants. II. Strength Losses

Berndt, Hans-Joachim; Schniewind, Arno P.; Woo, Jung‐Je

doi:10.1515/hfsg.1990.44.6.439

Cited by 8 publications

(3 citation statements)

References 1 publication

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“…In addition, wood treated with acid (Kass et al 1970) showed a convincing correlation between MOR and pentosan content. This idea was pursued further (Berndt et al 1990), and the authors attempted to correlate the area of this exothermic peak with the strength loss of FR-treated wood. Under this proposed theory, some loadsharing capacity would not only be due to covalent or secondary chemical bonding, but to mechanical entanglements between hemicellular sidechains and zones of amorphous cellulose or other matrix components.…”

Section: Microfibril Compared With Matrix Failurementioning

confidence: 99%

Influence of Degree of Polymerization of Cellulose and Hemicellulose on Strength Loss in Fire-Retardant-Treated Southern Pine

Sweet¹,

Winandy²

1999

Holzforschung

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Southern pine boards, both untreated and treated with a fire retardant, were exposed to either a room temperature or high temperature (66°C (150°F)) environment. Strength properties were measured after 1 and 1-1/2 years of exposure, respectively. The degree of polymerization and the chemical composition of αcellulose isolated from the exposed wood were measured. Little relationship was found between degree of polymerization and strength. However, a strong relationship was found between the amount of mannan in the α-cellulose isolated from the wood and the modulus of rupture and the work-tomaximum load of solid wood. This correlation leads to the conclusion that hemicellulose plays an important role in determining the strength of wood.

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Section: Microfibril Compared With Matrix Failurementioning

confidence: 99%

Influence of Degree of Polymerization of Cellulose and Hemicellulose on Strength Loss in Fire-Retardant-Treated Southern Pine

Sweet¹,

Winandy²

1999

Holzforschung

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“…It is well known that some guanidine compounds are one of most effective and economical flame-retardants for hemp. Some authors suggested that these compounds could improve flame retardance of hemp and accelerate the formation of a carbonized layer on the materials [2,3]. It was reported that such additives could lead to a lowering of the decomposition temperature and a higher char yield [4].…”

Section: Introductionmentioning

confidence: 99%

Thermal Degradation of Hemp Treated with Guanidine Nitrate

Yang

2013

AMM

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Hemp was treated with guanidine nitrate to impart flame retardance. The thermal degradation of the samples were studied by thermogravimetry (TG) and differential thermal analysis (DTA). The flame retardance was determined by LOI. Morphology of the char structure was studied by SEM to obtain information concerning the thermal degradation mechanism. For hemp treated with guanidine nitrate, which has higher LOI and char yield values, the oxidative decomposition stages include a decomposition stage at lower temperatures (203-240°C) , leading to more carbonaceous residue and small amount of flammable products to get the good flame retardance. The SEM of the chars of hemp treated with guanidine nitrate also indicate the structure of the charring layer may increase heat insulation, and protect inner matrix materials.

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“…It is well known that some guanidine compounds are one of most effective and economical flame-retardants for wood. Some authors suggested that these compounds could improve flame retardance of wood and accelerate the formation of a carbonized layer on the materials [2,3]. It was reported that such additives could lead to a lowering of the decomposition temperature and a higher char yield [4].…”

Section: Introductionmentioning

confidence: 99%