Thermal rearrangement study of low molecular weight polybutadiene

Ziaee, Farshid; Mobarakeh, Hamid Salehi; Nekoomanesh, Mehdi

doi:10.1016/j.polymdegradstab.2009.06.002

Cited by 10 publications

(5 citation statements)

References 21 publications

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“…2) also shows the decreasing in the resonance signals at 38.2, 30.1 and 24.9 ppm which were respectively assigned to the allylic carbons of trans and cis monomer connected to a vinyl monomer. So, the vinyl group reacted with these allylic carbons to form saturated structures corresponding to the aliphatic resonance signals at 15.8 ppm (CH 3 ); 30.7, 35.7 ppm (CH 2 ); 40.8, 42.9 and 46.3 ppm (CH) [10,11].…”

Section: Resultsmentioning

confidence: 99%

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New structures from the thermal rearrangement of polybutadiene revealed by 2D HSQC NMR

Hùng¹,

Sanglar²,

Grenier‐Loustalot³

et al. 2011

Polymer Degradation and Stability

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Section: Resultsmentioning

confidence: 99%

“…Recently, the appearance of methyl group in the 13 C NMR spectrum [10] was explained by the scission at two adjacent vinyl isomers and the scission at adjacent vinyl with cis or trans isomer.…”

Section: Introductionmentioning

confidence: 99%

New structures from the thermal rearrangement of polybutadiene revealed by 2D HSQC NMR

Hùng¹,

Sanglar²,

Grenier‐Loustalot³

et al. 2011

Polymer Degradation and Stability

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“…In addition, Golub observed this reaction to be second-order in the 1,2 unit concentration, although an explanation was not provided for this observation in low vinyl PB. Subsequent 13 C NMR studies by Doskočilová et al and later Ziaee and coworkers − identified that the 1,2 unit adds at a 1,4 unit adjacent to a 1,2 unit producing the same structure as proposed in Golub’s later work . This reaction scheme would explain the observation of a second-order reaction in 1,2 concentration even though only one 1,2 unit adds to the PB chain.…”

Section: Resultsmentioning

confidence: 72%

Thermal Annealing of High cis-1,4-Polybutadiene/Octadecyl Acrylate Blends as a One-Step Process for Fabricating Shape Memory Polymers

Basak

Angel

Cavicchi

2023

ACS Appl. Polym. Mater.

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Blending molecular crystals with a cross-linkable elastomer is an inexpensive, formulation- and processing-friendly route to develop shape memory polymers (SMPs). In this work, a shape memory material consisting of thermally cross-linked, octadecyl acrylate (ODA)-grafted polybutadiene (PB) and free octadecyl acrylate was prepared. High-temperature (175 °C) annealing of a melt-processable blend of PB and ODA results in the ene grafting of a portion of the ODA onto the PB chains producing a side-chain crystalline polymer, while simultaneous cross-linking of the PB produces a cross-linked network. At ODA loadings of 0.66 ODA molecules:PB repeat unit (80 wt % ODA), materials with high shape fixity (>99%) and recovery (>99%) were prepared. Higher shape recovery was measured compared to previously reported peroxide cross-linked PB/ODA blends. Limited blooming of the free ODA was found on stored samples and during shape memory cycling, an improvement compared to other elastomer small molecule blends. These results are discussed in terms of the synthesis, structure, and physical properties of this blend system.

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“…There are several useful NMR parameters to get the information on the crosslink density, for example magnetic relaxation and the dipolar correlation effect. 40,41 These methods directly observe the NMR parameters of the polymer itself. On the other hand, one can use small particles to look inside the polymer, thus observing it indirectly through the behaviors of those probes.…”

Section: -38mentioning

confidence: 99%

Correlation between Physico-Mechanical and Rheological Properties of Rubber Compounds Based on NR-BR with C-C Gel Content in Polybutadiene

Ganjali¹,

Motiee²,

Tabatabaie³

2014

Polymer Korea

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In this study, microstructure and gel content (C-C) of polybutadiene rubber (PBR) were investigated using various techniques including ASTM D 3616, attenuated total reflectance Fourier transform infrared spectrometry (ATR FTIR), differential scanning calorimetry (DSC) and nuclear magnetic resonance spectroscopy (NMR). The ATR FTIR spectra of the samples were investigated to determine the cis, trans, 1, 2-vinyl and the C-C gel content in PBR. The absorbance ratios of specific peaks in different grades of PBR were correlated with the C-C gel content measured by the ATR FTIR techniques. Physico-mechanical and rheological properties of rubber compounds based on BR with various amounts of gel were determined. The results showed that there is an acceptable correlation between these properties and the C-C gel content of PBR.

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Thermal rearrangement study of low molecular weight polybutadiene

Cited by 10 publications

References 21 publications

New structures from the thermal rearrangement of polybutadiene revealed by 2D HSQC NMR

New structures from the thermal rearrangement of polybutadiene revealed by 2D HSQC NMR

Thermal Annealing of High cis-1,4-Polybutadiene/Octadecyl Acrylate Blends as a One-Step Process for Fabricating Shape Memory Polymers

Correlation between Physico-Mechanical and Rheological Properties of Rubber Compounds Based on NR-BR with C-C Gel Content in Polybutadiene

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