Influence of blocked polyisocyanate on the mechanical, thermal and interfacial properties of bamboo/hydroxyl-terminated polyurethane composites

Shen, Tengfei; Lu, Mangeng; Liang, Liyan; Zhou, Dewen

doi:10.1007/s13726-011-0003-0

Cited by 9 publications

(13 citation statements)

References 28 publications

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“…Bamboo particleboards were manufactured according to Shen et al . The dimensions and density of bamboo particleboard panels were selected as 10 cm × 10 cm × 3 mm and 900 ± 10 kg/m 3 , respectively.…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

“…The time needed for bamboo harvest is 3–5 years while the time needed for most woods harvest is several decades . However, the low mechanical strength caused by strong hydrophilic characteristics of cellulose limits the application of bamboo products and stimulates efforts to develop new bamboo composite . Therefore, another purpose of this study is to adopt the prepared low formaldehyde content PFSUF resins as adhesives to bond bamboo fiber to prepare bamboo particleboards and to enhance the mechanical strength and water resistance of bamboo particleboards.…”

Section: Introductionmentioning

confidence: 99%

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Urea formaldehyde resin with low formaldehyde content modified by phenol formaldehyde intermediates and properties of its bamboo particleboards

Zhang

Zheng

Guo

et al. 2015

J of Applied Polymer Sci

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Phenol formaldehyde reaction solution (PFS) was used to synthesize urea-formaldehyde resins (PFSUF resins) with low formaldehyde content. In addition, the prepared PFSUF resins were used as adhesives to bond bamboo particleboards. Mechanical properties, fracture morphology, water absorption ratio, and dimensional stability of bamboo particleboards have been studied by tensile tests, SEM tests, water absorption analysis, and swelling ratio analysis, respectively. The results demonstrate that the main ingredient of PFS is phenol formaldehyde intermediate 2,4,6-trimethylolphenate and proper amount of PFS can be used to reduce the formaldehyde content of UF resins effectively. The results also show that bamboo particleboards bonded with PFSUF resins exhibit better mechanical properties, water resistance, and dimensional stability than that bonded with pure UF resin. However, the results of TG and mechanical properties analysis exhibit that alternative curing agents to ammonium chloride should be studied to improve the curing properties of the PFSUF resins with low formaldehyde content. Taken together, this work provides a method of preparing environment-friendly PFSUF resins with low phenol and low formaldehyde content and the prepared resins have potential application in wood industry.

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Section: Materials and Experimental Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Urea formaldehyde resin with low formaldehyde content modified by phenol formaldehyde intermediates and properties of its bamboo particleboards

Zhang

Zheng

Guo

et al. 2015

J of Applied Polymer Sci

Self Cite

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“…In recent years, natural cellulose fiber-reinforced polymer composites have received widespread attention among material engineers and researchers to replace synthetic fibers in various applications, like structural, aerospace, automotive etc, due to advantages such as abundant availability of renewable resources, nontoxicity, biodegradability, nonabrasiveness to processing equipments, low cost, low density and good mechanical properties (Athijayamani et al, 2010;Shen et al, 2012). Despite the various advantages, these fibers had a number of disadvantages, when used as reinforcements, such as lower impact strength, higher moisture absorption and poor thermal stability (Athijayamani et al, 2009;Ghasemi & Farsi, 2010;Robertson et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Mechanical and wear behaviors of untreated and alkali treated Roselle fiber-reinforced vinyl ester composite

Manickam¹,

Kumar²,

Athijayamani³

et al. 2015

J Engin Res

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Mechanical and wear behaviors of untreated and alkali treated Roselle fiber-reinforced vinyl ester composite 98 Mechanical and wear behaviors of untreated and alkali treated Roselle fiber-reinforced vinyl ester compositeChinnappan Manickam*, Jagadisan Kumar**, Ayyanar Athijayamani*** and Natesan Diwahar**** ABSTRACTIn the present communication, the effect of mercerization or alkali (NaOH) treatment on mechanical and wear behavior of chopped Roselle fiber-reinforced vinyl ester (CRFRV) composite have been studied as the function of fiber content. The results show that the tensile, flexural and impact strength values of untreated and treated fiber composites increased with increasing fiber content up to 40 wt% and then dropped. It was observed that the better fiber content (weight percentage) for better mechanical properties is 40 wt% at both the untreated and treated fiber composites. The wear resistance of the composites fabricated with treated Roselle fibers was found to be of better wear resistance composites fabricated by untreated fibers.

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“…There has been some reviews 8,9 reported in some areas of blocked isocyanates and water-dispersible blocked polyisocynates, which was referred a large number of patents describing the applications of blocked isocyanates. Many patents and reports have revealed that phenols, 10 alcohols, 11 amine, 12 oximes, 13 amides, 14 sodiumBisulfate, 15 N-hydroxyphthalimide, 16 N,N-dimethylacrylamide, 17 imidazole, 18 and diethylene glycol monobutyl ether 19 could be used as blocking agents for isocyanates. These blocked isocyanate products often need relatively high de-blocking temperature which could be advantageous in some certain applications.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and stability research of reproducible aqueous polyurethane micelles with low de‐blocking temperature

Zhu

et al. 2015

J of Applied Polymer Sci

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Aqueous polyurethane micelles from 2,4,6-trichlorphenol blocking terminal-isocynate pre-polymer were prepared which could be de-blocked at low temperature. The prepared aqueous blocked polyurethane micelles (BPUMs) were uniform and spherical micro-particles. The particle size was decreased with increase of the DMPA content, while it was enlarged at first and then gradually decreased by increasing R-value. The stability of the micelles was affected by the R value, blocked efficiency and DMPA content. HDIBPUMs were more stable than HDI-BPUMs at the same condition. The stability was further researched by the zeta potential combining with technique and viscosity tracking method, and the initial zeta potential be used as the stability criterion. In addition, a stabilization mechanism of the micelles was proposed. TCP-blocked TDI-BPUMs could be initially de-blocked at about 75 C and TCPblocked HDI-BPUMs was de-blocked at about 80 C. The de-blocking temperature could be further reduced in the presence of catalyst, but it was scarcely affected by the change of R-value and DMPA content.

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Influence of blocked polyisocyanate on the mechanical, thermal and interfacial properties of bamboo/hydroxyl-terminated polyurethane composites

Cited by 9 publications

References 28 publications

Urea formaldehyde resin with low formaldehyde content modified by phenol formaldehyde intermediates and properties of its bamboo particleboards

Urea formaldehyde resin with low formaldehyde content modified by phenol formaldehyde intermediates and properties of its bamboo particleboards

Mechanical and wear behaviors of untreated and alkali treated Roselle fiber-reinforced vinyl ester composite

Synthesis and stability research of reproducible aqueous polyurethane micelles with low de‐blocking temperature

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