Cross-linking reaction of waterborne polyurethane adhesives containing different amount of ionic groups with hexamethoxymethyl melamine

Rahman, Mohammad Mizanur; Kim, Eun Young; Kwon, Ji Yun; Yoo, Hyung Joun; Kim, Han‐Do

doi:10.1016/j.ijadhadh.2007.03.004

Cited by 33 publications

(9 citation statements)

References 23 publications

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“…As a result of such efforts, waterborne polyurethane (WPU) has emerged out as one of the greener alternatives . WPUs supersede their solvent borne counterparts in terms of nontoxicity, nonflammability, and low or no content of organic solvent. − Today, WPU has applications across the globe as a coating, adhesive, primer, paint additive, defoamer, associate thickener, pigment paste, biomaterial, etc. − …”

Section: Introductionmentioning

confidence: 99%

Biobased Biodegradable Waterborne Hyperbranched Polyurethane as an Ecofriendly Sustainable Material

Gogoi

Karak

2014

ACS Sustainable Chem. Eng.

150

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Research thrust to address the problems confronting the use of conventional polymers like high volatile organic compound (VOC) content still remains a challenge. In this context, the authors report the synthesis of a sustainable and biodegradable waterborne hyperbranched polyurethane (WHPU) using polyphenolic tannic acid in lieu of vegetable oil as the biobased component. The chemical structure of WHPU was characterized by nuclear magnetic resonance and Fourier transform infrared spectroscopy. An UV−visible peak at the wavelength of 282 nm confirmed the presence of catechol moiety in WHPU. WHPU exhibited pronounced thermostability and desirable performance (tensile strength, 6.87 MPa; elongation at break, 315%; scratch hardness, 5.5 kg for 15 wt % tannic acid based WHPU). The radical scavenging and hemolytic assays of WHPU showed their potent antioxidant activity and cytocompatibility with the erythrocytes, respectively. Furthermore, WHPU exhibited bacterial degradation by Pseudomonas aeruginosa. Thus, the above results forward the synthesized WHPU as a potent ecofriendly and sustainable polymeric material by a simple approach that possesses a higher degree of sustainability over a purely petrochemical route.

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Section: Introductionmentioning

confidence: 99%

Biobased Biodegradable Waterborne Hyperbranched Polyurethane as an Ecofriendly Sustainable Material

Gogoi

Karak

2014

ACS Sustainable Chem. Eng.

150

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“…Uma importante área de utilização desse material é na fabricação de adesivos, uma vez que, os PUs se unem a maioria dos materiais sob a forma de adesivos eficientes, resistentes à vibração e, são aplicáveis em ampla faixa de temperatura [2] . Outra aplicação interessante é no desenvolvimento de membranas, que além de separarem efetivamente misturas de gases, como CO 2 e N 2 , podem ser utilizadas em recuperação de CO 2 do petróleo, remoção de hélio do gás natural e recuperação de H 2 da corrente do gás de purga da planta de amônia, dentre outras [3][4][5][6][7] . A grande aplicabilidade dos polímeros de poliuretano deve-se à versatilidade estrutural do PU possibilitar a escolha de uma ampla gama de diisocianatos e polióis como monômeros [8,9] .…”

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Caracterização de nanocompósitos de poliuretano/montmorilonita organofílica por RMN de baixo campo

et al. 2012

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IntroduçãoPoliuretanos (PUs) são polímeros utilizados na fabricação de elastômeros, propelentes, agentes encapsulantes, e em diversos setores como: construção, embalagens, equipamentos, livros, calçados, moveleiro, medicina, eletro-eletrônico, aeroespacial, automotivo, abrasivos, têxteis e outros [1] . Uma importante área de utilização desse material é na fabricação de adesivos, uma vez que, os PUs se unem a maioria dos materiais sob a forma de adesivos eficientes, resistentes à vibração e, são aplicáveis em ampla faixa de temperatura [2] . Outra aplicação interessante é no desenvolvimento de membranas, que além de separarem efetivamente misturas de gases, como CO 2 e N 2 , podem ser utilizadas em recuperação de CO 2 do petróleo, remoção de hélio do gás natural e recuperação de H 2 da corrente do gás de purga da planta de amônia, dentre outras [3][4][5][6][7] . A grande aplicabilidade dos polímeros de poliuretano deve-se à versatilidade estrutural do PU possibilitar a escolha de uma ampla gama de diisocianatos e polióis como monômeros [8,9] . A incorporação de nanocargas à matriz polimérica de PU pode diversificar ainda mais a utilização destes polímeros, pois a formação de nanocompósitos de PU tem mostrado melhoria de propriedades mecânicas, térmicas, de barreira, retardância de chama e estabilidade dimensional, quando comparados aos compósitos convencionais. Isto ocorre devido à boa dispersão das nanocargas e interação com a matriz de PU [9][10][11][12][13] . A caracterização de um material é a forma de entender a relação da sua estrutura com as propriedades que ele apresenta. No caso específico dos nanocompósitos poliméricos, é muito importante determinar a interação da matriz polimérica com a nanocarga; a dispersão homogênea desta nanocarga na matriz polimérica e formação de domínios de mobilidades distintas.Na literatura, a caracterização estrutural dos nanocompósitos poliméricos é normalmente feita pela espectroscopia de absorção na região do infravermelho. A caracterização da cristalinidade da fração argila e do polímero (quando este não é amorfo) é obtida pela difração de raios X; enquanto a microscopia eletrônica de transmissão mostra a dispersão das nanocargas, e as análises térmicas mostram as variações térmicas sofridas pelos novos Characterization of Polyurethane/Organophilic Montmorilonite Nanocomposites by Low Field NMRAbstract: Polyurethanes are important and versatile materials, mainly due to some of their properties, such as high resistance to abrasion and tearing, excellent absorption of mechanical shocks and good flexibility and elasticity. However, they have some drawbacks as well, such as low thermal stability and barrier properties. To overcome these disadvantages, various studies have been conducted involving organophilic polyurethane/montmorillonite nanocomposites. The investigation of the structure of polyurethane/clay nanocomposites has mainly been done by X-ray diffraction (XRD) and transmission electron microscopy (TEM). In this work, PU/clay nanocomposite films obtained by solution...

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“…The band at 815 cm -1 is due to the out-of-plane ring deformation and another intense band around 1551cm -1 is attributable to the N-C-N bending and ring deformation. The presence of a peak at 1482 cm -1 confirms the existence of some unreacted methoxy group in the HMMM-CNT dispersion [5]. Here, HMMM-CNT was prepared with a fixed amount of HMMM and a varied amount of CNT.…”

Section: Resultsmentioning

confidence: 72%

Synthesis and Properties of Cross-Linkable Waterborne Polyurethane/HMMM-CNT Nanocomposite

Rahman

Shaikh

2014

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Abstract. A series of cross-linked waterborne polyurethane/hexamethoxymethylmel-amine-carbon nanotube nanocomposites (WBPU/HMMM-CNT) were synthesized using carboxylic group functionalized CNT. The carboxylic groups on CNT were reacted with the methoxy groups of HMMM to get bonded HMMM-CNT. Unreacted methoxy group of HMMM-CNT was crosslinked with the carboxylic acid salt groups of WBPU and made crosslinked WBPU/HMMM-CNT nanocomposite. The mechanical properties (tensile strength and Young's modulus) of conventional WBPU, crosslinked WBPU/HMMM, WBPU/CNT and WBPU/HMMM-CNT nanocomposites were compared under three conditions: untreated, wet and dried. It was observed that the mechanical properties of the crosslinked WBPU/HMMM-CNT nanocomposites were the least affected by water compared to conventional WBPU, crosslinked WBPU/HMMM, and WBPU/CNT nanocomposites.Differential scanning calorimetry (DSC) analysis also confirmed that the WBPU/HMMM-CNT nanocomposite can absorbed least water which can be easily removed by heating without destroying their crystalline structure. Crosslinked WBPU/HMMM-CNT nanocomposite recovered most of its mechanical properties of (with optimum HMMM-CNT content) after drying.

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Cross-linking reaction of waterborne polyurethane adhesives containing different amount of ionic groups with hexamethoxymethyl melamine

Cited by 33 publications

References 23 publications

Biobased Biodegradable Waterborne Hyperbranched Polyurethane as an Ecofriendly Sustainable Material

Biobased Biodegradable Waterborne Hyperbranched Polyurethane as an Ecofriendly Sustainable Material

Caracterização de nanocompósitos de poliuretano/montmorilonita organofílica por RMN de baixo campo

Synthesis and Properties of Cross-Linkable Waterborne Polyurethane/HMMM-CNT Nanocomposite

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