Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 412 for “"Molecular weights"”.
-
The heat of fusion of iodine and the use of liquid iodine as a solvent in determining molecular weights
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1912.
-
Size Exclusion Chromatography of Poly(2-ethyl-2-oxazoline) Homopolymers and Poly(ethylene oxide)-b-Poly(2-ethyl-2-oxazoline) Copolymers
… is the method of choice for characterizing molecular 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 …
-
Characterization of the Surface Proteins of the Anatid herpesvirus
… to 199 Kd. AHV contains major polypeptides with molecular weights of 173, 144, 118, 105, and 76.3 Kd. In addition, AHV possess minor polypeptide bands with molecular weights of 195, 183, 92.8, 81.4, 55.7, 52.0, 42.2, 32.6, 17.1, 7.91, and 6.16 Kd. It has been demonstrated, in this study, that the …
-
Synthesis and Characterization of Linear and Branched Polylactic Acid for Use in Food Packaging Applications
<p>Polylactic acid (PLA) resins of various molecular weights and molecular weight distributions were synthesized. Linear, narrow molecular weight distribution (MWD) PLA resins were synthesized, as well as resins containing both high molecular weight branched structures and low molecular weight …
-
Physical interpretation of coarse-grained bead-spring models of complex fluids
… model and related field theories at realistic molecular weights. This model is complementary to field theoretic polymer simulations, which are computationally prohibitive for realistic molecular weights. Several applications of the model are demonstrated, including: fluctuation corrections to …
-
Initiated chemical vapor deposition of functional polyacrylic thin films
… Studies of PGMA iCVD deposition kinetics and molecular weights indicate a free radical polymerization mechanism and provide guide for vapor-phase synthesis of other vinyl monomers. The retained epoxy groups can crosslink under e-beam irradiation, resulting in e-beam patterning of iCVD PGMA …
-
Synthesis of Higher Molecular Weight Poly(D-glucaramides) and Poly(aldaramides) as Novel Gel Forming Agents
<p>Poly(alkylene D-glucaramides) with higher molecular weights than previously reported were prepared through a multi-step process beginning with 1:1 alkylenediammonium D-glucarate salts. These salts set a precise stoichiometric equivalence between co-monomers, a necessary requirement for higher …
-
Synthesis of Higher Molecular Weight Poly(D-glucaramides) and Poly(aldaramides) as Novel Gel Forming Agents
<p>Poly(alkylene D-glucaramides) with higher molecular weights than previously reported were prepared through a multi-step process beginning with 1:1 alkylenediammonium D-glucarate salts. These salts set a precise stoichiometric equivalence between co-monomers, a necessary requirement for higher …
-
Polysiloxane-polyarylester block copolymers: synthesis and characterization
… in large space structures. Relatively high molecular weight polysiloxane-polyarylester block copolymers were prepared by two different synthetic routes. A solution technique was used to synthesize well-defined, perfectly alternating block copolymers by reacting a difunctional …
-
Synthesis and Characterization of Hydrophilic-Hydrophobic Poly (Arylene Ether Sulfone) Random and Segmented Copolymers for Membrane Applications
… ether sulfone) random copolymers with oligomeric molecular weights that contain hydrophilic and hydrophobic segments for thin film composite (TFC) reverse osmosis membranes. These copolymers were synthesized and chemically modified to obtain novel crosslinkable poly(arylene ether sulfone) …
-
Identification of clone x rootstock effects on cold hardiness and relevant dehydrins changes in Cabernet franc (Vitis vinifera L.)
… of Cabernet franc. Dehydrin bands of five molecular weights (62 kDa, 57 kDa, 41 kDa, 30 kDa, and 23 kDa) were detected in the 2018-19 dormant season, and dehydrin bands of four molecular weights (62 kDa, 41 kDa, 30 kDa, and 23 kDa) were detected in the 2019-20 dormant season. The …
-
Synthesis and characterization of polycarbonate-polydimethylsiloxane block copolymers
… alternating block copolymers wherein the block molecular weights are equal to the number average molecular weights of the respective well-characterized oligomeric precursors. This silylamine-hydroxyl reaction is clean, efficient and can be utilized to produce copolymers which consist of a …
-
The use of enzymes in organic solvents in polytransesterification reactions
… conditions a commercially acceptable polymer molecular weight (Mn) of 20,000 daltons might be attained. Exploratory investigations were carried out using 1,4-butanediolibis(2,2,2- trichloroethyl) adipate and glutarate systems in diethyl ether, with and without molecular sieves. It was found …
-
Isolation and characterization of plasmids from human and environmental isolates of mycobacteria
… dependent mercuric reductase. Plasmids with molecular weights of 8.8, 11.2, 14.2, 16.9, 17.9, and 18.3 Md were also common among both human and environmental isolates. On the basis of molecular weight, 36 distinct plasmids were detected; their sizes ranged from 7 to 230 Md. It was concluded …
-
Multiblock Copolymer Synthesis in Aqueous Heterogeneous Systems
… Thus, highly organized sequence-controlled macromolecular architectures such as multiblock copolymers can now be synthesized. Synthetic chemical techniques have been implemented in homogeneous systems to achieve multiblock copolymers with time and resource efficiency, however, the synthetic …
-
Structure-Property Relationships of Polyisobutylene-Block-Polyamide Thermoplastic Elastomers
… and polyamide samples of varying molecular weights and types were synthesized and combined in different ratios to form a variety of polyisobutylene-<em>block</em>-polyamide (PIB-PA) samples. Mechanical stirring as opposed to magnetic mixing and an increase in the soft block …
-
The development of chemically engineered pullulan for drug delivery
… (polyoxypropylenediamine) compounds of differing molecular weights (230, 400 and 2000). Results concluded that all six pullulan derivatives show an increase in reduced viscosity to varying degrees, compared to the parent pullulan. Characterization of pullulan and the derivatives concluded that the …
-
The effects of PVP(FE(III)) catalyst and polymer molecular weight on gene delivery via biodegradable crosslinked polyethylenimine
… and resulted in polymers with a narrow range of molecular weights. In the present work, we utilized a heterogenous PVP(Fe(III)) catalyst to provide a more controllable PEI crosslinking reaction and wider range of biodegradable PEIs. The biodegradable PEIs reported here have molecular weights …
-
Synthesis and Characterization of Poly(lactide) Functional Oligomers and Block Copolymers
… (PEO-b-PDLLA), block copolymers with controlled molecular weights and good functionality on the poly(ethylene oxide) end for the design of potential core-shell delivery vehicles for HIV drugs. PEO-b-PDLLA block copolymer was used as a polymeric nanocarrier to encapsulate the HIV protease …
-
Characterization of proteins purified from a beta(1) integrin affinity column: A novel ecm molecule and a muscle-specific integrin alpha subunit
… characterize two of the major proteins with the molecular weights at 220 kD and 70 kD, respectively.
Page 1 of 21