Effect of chain architecture of polyol with secondary hydroxyl group on aggregation structure and mechanical properties of polyurethane elastomer

Polymer ◽  
2017 ◽  
Vol 116 ◽  
pp. 423-428 ◽  
Author(s):  
Shuhei Nozaki ◽  
Tomoyasu Hirai ◽  
Yuji Higaki ◽  
Kohji Yoshinaga ◽  
Ken Kojio ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hydroxyl Group ◽  
Polyurethane Elastomer ◽  
Secondary Hydroxyl ◽  
Chain Architecture ◽  
Aggregation Structure

Thermally healable PTMG-based polyurethane elastomer with robust mechanical properties and high healing efficiency

2018 ◽  
Vol 28 (1) ◽  
pp. 015008 ◽  
Author(s):  
Wanwan Wang ◽  
Hongxiang Chen ◽  
Qiaoli Dai ◽  
Dan Zhao ◽  
Yu Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Elastomer ◽  
Healing Efficiency

Performance of Wood-Polymer Composite Prepared by In Situ Synthesis of Terpolymer within Wood

2010 ◽  
Vol 34-35 ◽  
pp. 1165-1169 ◽  
Author(s):  
Yong Feng Li ◽  
Bao Gang Wang ◽  
Qi Liang Fu ◽  
Yi Xing Liu ◽  
Xiao Ying Dong
Keyword(s):  
Mechanical Properties ◽  
Porous Structure ◽  
Polymer Composite ◽  
Value Added ◽  
Untreated Wood ◽  
Modulus Of Rupture ◽  
Hydroxyl Group ◽  
Wood Polymer ◽  
Wood Polymer Composite

In order to improve the value-added applications of low-quality wood, a novel composite, wood-polymer composite, was fabricated by in-situ terpolymerization of MMA, VAc and St within wood porous structure. The structure of the composite and the reaction of monomers within wood were both analyzed by SEM and FTIR, and the mechanical properties were also evaluated. The SEM observation showed that the polymer mainly filled up wood pores, suggesting good polymerizating crafts. The FTIR results indicated that under the employed crafts, three monomers terpolymerized in wood porous structure, and grafted onto wood matrix through reaction of ester group from monomers and hydroxyl group from wood components, suggesting chemical combination between the two phases. The mechanical properties of the wood-polymer composite involving modulus of rupture, compressive strength, wearability and hardness were improved 69%, 68%, 36% and 210% over those of untreated wood, respectively. Such method seems to be an effective way to converting low-quality wood to high-quality wood.

Preparation of Polymer Nanoparticles and Application on Nitrile-Butadiene Rubber Reinforcement

2017 ◽  
Vol 900 ◽  
pp. 35-39
Author(s):  
Cheng Chien Wang ◽  
Chih Lung Chiu ◽  
Jian Sheng Shen
Keyword(s):  
Mechanical Properties ◽  
Hydroxyl Group ◽  
Molar Ratio ◽  
Butadiene Rubber ◽  
Microemulsion Polymerization ◽  
Rubber Latex ◽  
Elongation At Break ◽  
Divinyl Benzene ◽  
Rubber Nanocomposites ◽  
Average Size

The different amount of hydrophilic hydroxyl group, including 3, 5, 7 and 10 wt.% copoly (styrene-co - divinyl benzene – co - 2-hydroxylethylenemethacrylate) (poly (St-co-DVB- co -HEMA) s) nanoparticles were synthesized via microemulsion polymerization in the present paper. The average size of the poly (St-co-DVB-co-HEMA) s was ca. 44 nm after zetasizer (DLS) measurement and SEM observation. The characteristic peaks at 3200 ~3600 cm-1 in FTIR was assigned at hydroxyl group of HEMA unit. The NBR/poly (St-co-DVB-co-HEMA) s composites films with 250 μm thickness were prepared simply via latex mixing and followed by spinning coating. The mechanical properties of the poly (St-co-DVB-co-HEMA) s/rubber nanocomposites, including the tensile strength, modulus and elongation, were increased with that of increasing of poly (St-co-DVB-co-HEMA) s adding. In addition, as the poly (St-co-DVB-co-HEMA) s nanoparticles carried out with constant St/HEMA molar ratio of 97:3 and the DVB content in 10 wt.%, the elongation at break that up to more than 3500% and the ultimate stress increased from 0.2 MPa to 0.6 MPa. The poly (St-co-DVB-co-HEMA) s nanoparticles prepared by emulsion polymerization could be successfully enhanced the mechanical properties of rubber latex.

scholarly journals Novolac/Phenol-Containing Phthalonitrile Blends: Curing Characteristics and Composite Mechanical Properties

Polymers ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 126 ◽  
Author(s):  
Hanqi Zhang ◽  
Bing Wang ◽  
Yanna Wang ◽  
Heng Zhou
Keyword(s):  
Mechanical Properties ◽  
Fracture Strain ◽  
Mechanical Test ◽  
Gelation Time ◽  
Mechanical Analysis ◽  
Curing Temperature ◽  
Hydroxyl Group ◽  
Rheological Analysis ◽  
Curing Characteristics ◽  
Ft Ir

The phenol-containing phthalonitrile resin is a kind of self-curing phthalonitrile resin with high-temperature resistance and excellent properties. However, the onefold phthalonitrile resin is unattainable to cured completely, and the brittleness of the cured product is non-negligible. This paper focuses on solving the above problems by blending novolac resin into phenol-containing phthalonitrile. Under the action of abundant hydroxyl group, the initial curing temperature and gelation time at 170 °C decrease by 88 °C and 2820 s, respectively, monitored by DSC and rheological analysis. FT-IR spectra of copolymers showed that the addition of novolac increased the conversion rate of nitrile. When the novolac mass fraction is 10%, the peak of nitrile group disappears, which means the complete reaction. The mechanical test of blends composites shows that the maximum fracture strain of 10 wt% novolac addition is 122% higher than those of neat phthalonitrile composites on account of the introduction of flexible novolac chain segments. The mechanical properties are sensitive to elevated post-cured temperature; this is consistent with the result of morphological investigation using SEM. Finally, the dynamic mechanical analysis indicated that the glass transition temperature heightened with the increase of novolac content and post-curing temperature.

Effect of graphene loading on mechanical properties of polyurethane elastomer

2019 ◽  
Vol 16 ◽  
pp. 1617-1621
Author(s):  
CW Heng ◽  
Teh Pei Leng ◽  
A.G. Supri ◽  
Yeoh Cheow Keat ◽  
Kathiravan Suppiah
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Elastomer

scholarly journals Effect of Diisocyanates as Compatibilizer on the Properties of BF/PBAT Composites by In Situ Reactive Compatibilization, Crosslinking and Chain Extension

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 806 ◽  
Author(s):  
Xiwei Xie ◽  
Caili Zhang ◽  
Yunxuan Weng ◽  
Xiaoqian Diao ◽  
Xinyu Song
Keyword(s):  
Mechanical Properties ◽  
Impact Strength ◽  
Phenyl Isocyanate ◽  
Chain Extension ◽  
Hydroxyl Group ◽  
Reactive Compatibilization ◽  
Carbamate Group ◽  
Bamboo Powder ◽  
Reactive Compatibilizer

Due to the hydrophobic nature of poly (butylene terephthalate) (PBAT), and the hydrophilic nature of bamboo flour (BF), a BF/PBAT (50/50) blend shows low mechanical properties, and especially shows poor impact strength. In order to increase the interfacial adhesion between BF and PBAT, diisocyanate was used as a reactive compatibilizer to modify bamboo powder. A series of BF/PBAT composites were prepared by the method of mixing and melting in an internal mixer. After adding reactive compatibilizer 4,4′-methylenebis(phenyl isocyanate) (MDI), BF/PBAT (50/50) composites with high mechanical properties were successfully prepared. The tensile strength, elongation at break, and impact strength of the BF/MDI-2/PBAT composite with 2 wt % MDI content were increased by 1.9, 6.8, and 4.3 times respectively over the BF/PBAT blend without the added MDI. The higher toughening effect of MDI in BF/PBAT composites can be mainly ascribed to the improved interface bonding between BF and PBAT. The isocyanate group of MDI can react with the hydroxyl group on the BF surface and in situ formation of the carbamate group on the BF surface. The residual isocyanate can then react with the hydroxyl group of PBAT and form carbamate groups. The rheological behaviors demonstrate that addition of appropriate amounts of MDI, 1 wt % and 2 wt %, can promote the flowability of the molten BF/PBAT composites due to the decrease in interparticle interaction between bamboo powder and the increase in the thermal motion of the molecules.

scholarly journals Highly Conductive Carbon Nanotube-Thermoplastic Polyurethane Nanocomposite for Smart Clothing Applications and Beyond

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1287 ◽  
Author(s):  
Sandra Lepak-Kuc ◽  
Bartłomiej Podsiadły ◽  
Andrzej Skalski ◽  
Daniel Janczak ◽  
Małgorzata Jakubowska ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotube ◽  
Thermoplastic Polyurethane ◽  
Polyurethane Elastomer ◽  
Light Weight ◽  
Composite Fibers ◽  
Smart Clothing ◽  
Potential Applications ◽  
Order Of Magnitude ◽  
Method Of Production

The following paper presents a simple, inexpensive and scalable method of production of carbon nanotube-polyurethane elastomer composite. The new method enables the formation of fibers with 40% w/w of nanotubes in a polymer. Thanks to the 8 times higher content of nanotubes than previously reported for such composites, over an order of magnitude higher electrical conductivity is also observed. The composite fibers are highly elastic and both their electrical and mechanical properties may be easily controlled by changing the nanotubes content in the composite. It is shown that these composite fibers may be easily integrated with traditional textiles by sewing or ironing. However, taking into account their light-weight, high conductivity, flexibility and easiness of molding it may be expected that their potential applications are not limited to the smart textiles industry.

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