The behavior of semi-rigid polyurethane film based on functionalized rubber by one-shot and two-shot method preparation

Hirzin, Radin Siti Fazlina Nazrah; Azzahari, Ahmad Danial; Yahya, Rosiyah; Hassan, Aziz; Tahir, Hairani

doi:10.1007/s10853-018-2578-8

Cited by 3 publications

(3 citation statements)

References 30 publications

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“…The neat rPU showed a different behavior in DTG curves, and this status can be explained that this is probably the result of the degradation of the residual unreacted polyol component. In addition, the degradation rate of the NPU at 343 °C is only slightly lower than the degradation rate at 389 °C, which is related to the degradation of the flexible segments (Kebir et al 2006, Hirzin et al 2018. The extent of decomposition and summary of the decomposition process of the neat rPU, whose thermal stability was changed by the addition of MCC and CNC, are given in Table 2.…”

Section: Resultsmentioning

confidence: 99%

Effects of cellulose micro and nanocrystals on the mechanical, thermal, morphological, and structural properties of rigid polyurethanes

Kaya,

Yalçın,

Aydemir

2024

BioRes

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Effects of adding microcrystalline cellulose (MCC) and cellulose nanocrystals (CNC) were evaluated relative to the mechanical, thermal, morphological, and structural properties of rigid polyurethanes (rPUs). The composites were prepared with the blending of polyols/isocyanates and the cellulosic fillers at 0.25%, 0.5%, and 1% loadings. Scanning electron microscopic images showed that the samples had micro-scaled porosity, with cell sizes ranging from 250 to 800 nm. The fillers improved the mechanical strengths and modulus of neat rPUs due to the presence of the nano-sized cells in rPUs matrix. The addition of both fillers generally did not provide a positive effect on the thermal properties, and the weight loss generally increased while the loading rate of the fillers was increased from 0.25% to 1%. The samples had two small crystalline peaks at 18° and 19° according to the X-ray diffraction analysis. From the results, it can be said that the presence of both fillers generally improved all properties of the neat rPUs, and the effects of CNC on the properties were higher than MCC due to both lower particle size and the higher crystallinity of CNC.

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Section: Resultsmentioning

confidence: 99%

Effects of cellulose micro and nanocrystals on the mechanical, thermal, morphological, and structural properties of rigid polyurethanes

Kaya,

Yalçın,

Aydemir

2024

BioRes

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“…The PUs containing OP showed higher hardness and density compared to the REF. Large standard deviations of hardness tests results is probably the effect from insufficient heterogeneity of materials at different places caused by the use of the one-step method during synthesis [ 59 ]. The lower the amount of phosphorus polyol in the polyurethane, the lower density of the materials.…”

Section: Resultsmentioning

confidence: 99%

Novel Cast Polyurethanes Obtained by Using Reactive Phosphorus-Containing Polyol: Synthesis, Thermal Analysis and Combustion Behaviors

2021

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Phosphorus-containing polyol applications in polyurethane synthesis can prevent volatilization of flame retardants and their migration on the surface of a material. In this work, novel cast polyurethanes were prepared by a one-step method with the use of different amounts of phosphorus-containing polyol, 4,4′–diphenylmethane diisocyanate and 1,4-butanediol. The chemical structure, thermal, physicochemical and mechanical properties and flame resistance of the prepared materials were investigated. The results obtained for cast flame-retarded polyurethanes were compared with cast polyurethane synthesized with commonly known polyether polyol. It has been shown that with an increasing amount of phosphorus content to polyurethane’s chemical structure, an increased flame resistance and char yield were found during combustion tests. Phosphorus polyol worked in both the condensed (reduced heat and mass exchange) and gas phase (inhibition of flame propagation during burning). The obtained materials contained phosphorus polyol, indicating higher thermal stability in an oxidative environment than an inert atmosphere.

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“…As NR is a renewable resource, its applications should not be limited to common products, but can be diversified through modifications to the NR chains to produce new rubbers with new properties. The molecular structure of NR consists of a double bond in its repeating units of cis -1,4-isoprene, which can be modified with regard to specific functional groups such as epoxidized natural rubber (ENR) [3], acrylated NR [4], carbonyl telechelic natural rubber (CTNR) [5], and hydroxyl telechelic liquid natural rubber (HTNR) [6,7].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of Low-Molecular-Weight Natural Rubber Latex via Photodegradation Catalyzed by Nano TiO2

et al. 2018

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Natural rubber is one of the most important renewable biopolymers used in many applications due to its special properties that cannot be easily mimicked by synthetic polymers. To sustain the existence of natural rubber in industries, modifications have been made to its chemical structure from time to time in order to obtain new properties and to enable it to be employed in new applications. The chemical structure of natural rubber can be modified by exposure to ultraviolet light to reduce its molecular weight. Under controlled conditions, the natural rubber chains will be broken by photodegradation to yield low-molecular-weight natural rubber. The aim of this work was to obtain what is known as liquid natural rubber via photodegradation, with titanium dioxide nanocrystals as the catalyst. Titanium dioxide, which was firstly synthesized using the sol–gel method, was confirmed to be in the form of an anatase, with a size of about 10 nm. In this work, the photodegradation was carried out in latex state and yielded low-molecular-weight natural rubber latex of less than 10,000 g/mol. The presence of hydroxyl and carbonyl groups on the liquid natural rubber (LNR) chains was observed, resulting from the breaking of the chains. Scanning electron microscopy of the NR latex particles showed that titanium dioxide nanocrystals were embedded on the latex surface, but then detached during the degradation reaction.

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The behavior of semi-rigid polyurethane film based on functionalized rubber by one-shot and two-shot method preparation

Cited by 3 publications

References 30 publications

Effects of cellulose micro and nanocrystals on the mechanical, thermal, morphological, and structural properties of rigid polyurethanes

Effects of cellulose micro and nanocrystals on the mechanical, thermal, morphological, and structural properties of rigid polyurethanes

Novel Cast Polyurethanes Obtained by Using Reactive Phosphorus-Containing Polyol: Synthesis, Thermal Analysis and Combustion Behaviors

Preparation and Characterization of Low-Molecular-Weight Natural Rubber Latex via Photodegradation Catalyzed by Nano TiO2

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