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Showing 1 to 20 of 3323 for “"poly"”.
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Poly(ferrocenylpersulfide)s
… The trisulfides were converted to the polymers $\rm\lbrack (RC\sb5H\sb3)\sb2FeS\sb2\rbrack\sb{n}$ upon desulfurization with Bu$\sb3$P, which was shown by $\sp{31}$P NMR spectroscopy to be converted to Bu$\sp3$PS. GPC measurements indicated that the (t-Bu)- and (t-Bu)$\sb2$- substituted …
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Study of poly (l-lactic acid)/poly (d-lactic acid) stereocomplex as nucleating agent for poly (l- lactic acid) crystallization
Poly (lactic acid) (PLA) is a biodegradable polymer with good renewability and processability. However, it has some drawbacks. The Poly (lactic acid) (PLA) stereocomplex formed via the interaction between optical isomers Poly (L-lactic acid) (PLLA) and Poly (D-lactic acid) (PDLA), provides …
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The blending of hydroxypropyl lignin with poly(methylmethacrylate) and poly(vinyl alcohol)
Polymer blends consisting of hydroxypropyl lignin (HPL ) and commercially available poly(methyl methacrylate) (PMMA ) and poly(vinyl alcohol) (PVA) were evaluated in terms of their morphology, viscoelastic properties and mechanical properties. In the case of HPL/PMMA blends experimental variables …
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Size Exclusion Chromatography of Poly(2-ethyl-2-oxazoline) Homopolymers and Poly(ethylene oxide)-b-Poly(2-ethyl-2-oxazoline) Copolymers
… weights and molecular weight distributions of polymers. An important advancement in SEC is multidetection SEC which includes multi-angle laser light scattering, viscometry, refractive index and UV spectroscopy to analyze block and graft copolymers as well as polymers with oligomeric molecular …
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patial Control of the Conductivity of Poly(3,4-ethylenedioxythiopehe): Poly(styrenesulfonate) Thin Films
Poly(3, 4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) thin films have undergone treatment from rapid thermal processing and direct ultraviolet irradiation at a wavelength of 254 nm. Through various characterization methods, the underlying physical changes as a result of rapid thermal …
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Preparation and characterisation of poly(ethylene terephthalate) and poly(vinyl alcohol)/clay nanocomposites.
The formation of poly (ethylene terephthalate) (PET)/organo-montmorillonite and poly (vinyl alcohol)(PVOH)/ montmorillonite nanocomposites and the diffusion behaviour of water and acetone/water mixtures into the latter have been investigated. Nanocomposites of PET and various, commercially …
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Spectroscopic investigations of acrylodan dye interactions with poly(amidoamine) and poly(propyleneimine) dendrimers
… phenol blue, the first direct examination of the polyamidoamine (PAMAM) and polypropylenimine (PPI) dendrimer core cavities was reported by a previous research group member. This previous work revealed the need to further understand the sequestering abilities and host-guest properties of these …
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Synthesis and basic characteristics of segmented poly(arylene ether sulfone)-poly(arylate) copolymers
Segmented copolymer systems composed of an amorphous g1assy engineering polymer as one segment and a potentially anisotropic polyester as the second segment were synthesized and investigated. The engineering thermoplastic segment was based on various all aromatic poly(arylene ether sulfooes) …
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A study of miscibility, morphology, crystallization and melting behavior of isotactic poly(propylene) in blends of poly(propylene) and poly(1-butene)
… thesis, the miscibility behavior of blends of polypropylene (PP) and poly(l-butene) (PB1) will be reexamined. The driving force for this study is the fact that contradictory conclusions on this subject exist in the literature. In this thesis, the glass transition behavior, morphology, …
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Amphiphilic Poly(2-isopropyl-2-oxazoline)-block-poly(lactide) Nanoparticles as Drug Delivery Vehicles
… of the unique morphologies of water-soluble poly(2-isopropyl-2-oxazoline)-block-poly(DL-lactide) and poly(2-isopropyl-2-oxazoline)-block-poly(L-lactide) (PiPOx-b-PDLLA and PiPOx-b-PLLA) nanoparticles was obtained via Fluorescence Spectroscopy. Additionally, loading and release studies were …
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Crystalline Morphologies of Poly(butadiene)-b-Poly(ethylene oxide) Block Copolymers in n-Heptane
… the molecular composition of the semicrystalline poly(butadiene)-b-poly(ethylene oxide)(PB-b-PEO) block copolymers was investigated. The crystalline morphologies discussed here have been generated from selective solvent condition (70°C in n-heptane) via two thermal pathways: (A) by direct …
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Purification and characterization of a poly(dG).poly(dC)-binding protein from Parenchinus angulosis
A poly(dG).poly(dC)-binding protein (suGF1) had previously been identified in sea urchin (Parenchinus angulosis) embryonic nuclear extracts (J.P. Hapgood, personal communication). suGF1 may be involved in the regulation of early histone gene expression by interaction with a nudeosome which has been …
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Polycation-polyanion complexes : preparation and properties of poly(vinylbenzyl-trimethyl ammonium)-poly(styrene sulfonate)
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1961.
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Fluorine-Containing Poly(aryl ethers)
Incorporation of fluorine into the polymer backbone is known to increase solubility, thermal stability, oxidative resistance and flame resistance while decreasing dielectric constant, water absorption and color. Another moiety often incorporated into polymers to improve thermal stability is the …
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The Degradation and Drug Release Mechanisms of Poly(ethylene glycol)-functionalised Poly(L-lactide) Polymers
Poly(L-lactide) (PLLA) is a well-recognised bioresorbable polymer known to degrade after 1.5 to 5 years by hydrolysis. For certain medical device or drug delivery applications, it would be desirable to reduce this degradation time as strategies for tailoring degradation and drug release rates …
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The Physical and Spectroscopic Study of a Series of Poly(3-hexyl thiophene) Homopolymers and Poly(3-hexyl thiophene)-block-Poly(2-hydroxyethyl methacrylate) Diblock Copolymers
In block-selective solvent, the rod-coil block copolymers can form various micellar structures. With block copolymers that contain a conjugated polymer block, the conformation of the conjugated polymer can be reflected by spectral changes in the solution. Therefore, it is of interest to study the …
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