Influence of soft segment content and chain length on the physical properties of poly(ether ester) elastomers and fabrication of honeycomb pattern and electrospun fiber

2013 ◽  
Vol 73 (9) ◽  
pp. 1213-1222 ◽  
Author(s):  
Johnson V. John ◽  
Byeong Kyu Moon ◽  
Il Kim
Keyword(s):  
Physical Properties ◽  
Chain Length ◽  
Soft Segment ◽  
Electrospun Fiber ◽  
Ether Ester ◽  
Honeycomb Pattern

scholarly journals Impact of Macrodiols on the Morphological Behavior of H12MDI/HDO-Based Polyurethane Elastomer

Polymers ◽  
2021 ◽  
Vol 13 (13) ◽  
pp. 2060
Author(s):  
Shazia Naheed ◽  
Mohammad Zuber ◽  
Mahwish Salman ◽  
Nasir Rasool ◽  
Zumaira Siddique ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Contact Angle ◽  
Chain Length ◽  
Microphase Separation ◽  
Soft Segment ◽  
Group Identification ◽  
Degree Of Crystallinity ◽  
Polyurethane Elastomers ◽  
Hard Segments ◽  
Morphological Behavior

In this study, we evaluated the morphological behavior of polyurethane elastomers (PUEs) by modifying the soft segment chain length. This was achieved by increasing the soft segment molecular weight (Mn = 400–4000 gmol−1). In this regard, polycaprolactone diol (PCL) was selected as the soft segment, and 4,4′-cyclohexamethylene diisocyanate (H12MDI) and 1,6-hexanediol (HDO) were chosen as the hard segments. The films were prepared by curing polymer on Teflon surfaces. Fourier transform infrared spectroscopy (FTIR) was utilized for functional group identification in the prepared elastomers. FTIR peaks indicated the disappearance of −NCO and −OH groups and the formation of urethane (NHCOO) groups. The morphological behavior of the synthesized polymer samples was also elucidated using scanning electron microscopy (SEM) and atomic force microscopy (AFM) techniques. The AFM and SEM results indicated that the extent of microphase separation was enhanced by an increase in the molecular weight of PCL. The phase separation and degree of crystallinity of the soft and hard segments were described using X-ray diffraction (XRD). It was observed that the degree of crystallinity of the synthesized polymers increased with an increase in the soft segment’s chain length. To evaluate hydrophilicity/hydrophobicity, the contact angle was measured. A gradual increase in the contact angle with distilled water and diiodomethane (38.6°–54.9°) test liquids was observed. Moreover, the decrease in surface energy (46.95–24.45 mN/m) was also found to be inconsistent by increasing the molecular weight of polyols.

Impact of PEG Chain Length on the Physical Properties and Bioactivity of PEGylated Chitosan/siRNA Nanoparticles in Vitro and in Vivo

2017 ◽  
Vol 9 (14) ◽  
pp. 12203-12216 ◽  
Author(s):  
Chuanxu Yang ◽  
Shan Gao ◽  
Frederik Dagnæs-Hansen ◽  
Maria Jakobsen ◽  
Jørgen Kjems
Keyword(s):  
Physical Properties ◽  
Chain Length ◽  
Peg Chain Length

Novel Thermally Stable Poly(sulfone ether ester amide)s with Improved Solubility

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
Shahram Mehdipour – Ataei ◽  
Samal Babanzadeh ◽  
Naeemeh Bahri-Laleh
Keyword(s):  
Physical Properties ◽  
Nitro Group ◽  
Amino Compound ◽  
Aprotic Solvents ◽  
Thermally Stable ◽  
Step Method ◽  
Conventional Methods ◽  
Ether Ester ◽  
Dipolar Aprotic Solvents

AbstractA three-step method was used to prepare a novel sulfone ether ester diamine. In the first step, reaction of 1,5-dihydroxy naphthalene with 4- nitrobenzoyl chloride afforded 5-hydroxy-1-naphthyl-4-nitrobenzoate (HNNB). By reduction of nitro group, an amino compound named 5-hydroxyl-1-naphthyl- 4-aminobenzoate (HNAB) was obtained. Reaction of HNAB (two moles) with bis (4-chlorophenyl) sulfone resulted in preparation of a novel sulfone ether ester diamine (SEED). Polycondensation reactions of the diamine with aromatic and aliphatic diacid chlorides led to preparation of new poly(sulfone ether ester amide)s. Conventional methods were used to characterize the structure of the monomer and polymers. Physical properties of the polymers were also studied. The polyamides were thermally stable and they showed improved solubility in dipolar aprotic solvents.

scholarly journals Impacts of cross-linker chain length on the physical properties of polyampholyte hydrogels

2019 ◽  
Vol 14 (3) ◽  
pp. 031002 ◽  
Author(s):  
Emily Mariner ◽  
Stephanie L. Haag ◽  
Matthew T. Bernards
Keyword(s):  
Physical Properties ◽  
Chain Length ◽  
Linker Chain ◽  
Cross Linker

Synthesis and physical properties of tris(dialkylamino)cyclopropenium bistriflamide ionic liquids

RSC Advances ◽  
2015 ◽  
Vol 5 (49) ◽  
pp. 39565-39579 ◽  
Author(s):  
Kelvin J. Walst ◽  
Ruhamah Yunis ◽  
Paul M. Bayley ◽  
Douglas R. MacFarlane ◽  
Callum J. Ward ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Physical Properties ◽  
Chain Length ◽  
Alkyl Chain ◽  
Alkyl Chain Length

An investigation of symmetry (D3h, C3h, C2v and Cs) and alkyl chain length (6–60 alkyl carbon atoms) effects on the physical properties of peralkylated triaminocyclopropenium bistriflamide salts.

Aliphatic urethanes. Effect of chain length on some physical properties

1961 ◽  
Vol 38 (4) ◽  
pp. 205-208 ◽  
Author(s):  
Sol Shulman ◽  
Marvin W. Formo ◽  
Alfred E. Rheineck
Keyword(s):  
Physical Properties ◽  
Chain Length
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