Properties and biodegradability of chain-extended copoly(succinic anhydride/ethylene oxide)

1996 ◽  
Vol 4 (4) ◽  
pp. 225-233 ◽  
Author(s):  
Yasukatsu Maeda ◽  
Atsuyoshi Nakayama ◽  
Norioki Kawasaki ◽  
Kazuko Hayashi ◽  
Seiichi Aiba ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Succinic Anhydride

scholarly journals The Morphology and Enzymatic Degradation of Chain-Extended Copoly(succinic anhydride/ethylene oxide) Films

1997 ◽  
Vol 29 (10) ◽  
pp. 836-842 ◽  
Author(s):  
Yasukatsu Maeda ◽  
Atsuyoshi Nakayama ◽  
Norioki Kawasaki ◽  
Kazuko Hayashi ◽  
Seiichi Aiba ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Enzymatic Degradation ◽  
Succinic Anhydride ◽  
Oxide Films

scholarly journals Synthesis and Characterization of Copoly(succinic anhydride-ethylene oxide)-Poly(L-lactide) Block Copolymer

2000 ◽  
Vol 32 (4) ◽  
pp. 307-315 ◽  
Author(s):  
Yasukatsu Maeda ◽  
Atsuyoshi Nakayama ◽  
Ioannis Arvanitoyannis ◽  
Norioki Kawasaki ◽  
Kazuko Hayashi ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Ethylene Oxide ◽  
Succinic Anhydride ◽  
Synthesis And Characterization

scholarly journals Enzymatic Hydrolysis of Copoly(succinic anhydride/ethylene oxide) and Copoly(succinic anhydride/ethylene oxide/phthalic anhydride).

1997 ◽  
Vol 54 (11) ◽  
pp. 796-804 ◽  
Author(s):  
Yasukatsu MAEDA ◽  
Atsuyoshi NAKAYAMA ◽  
Norioki KAWASAKI ◽  
Kazuko HAYASHI ◽  
Noboru YAMAMOTO ◽  
...  
Keyword(s):  
Enzymatic Hydrolysis ◽  
Ethylene Oxide ◽  
Phthalic Anhydride ◽  
Succinic Anhydride ◽  
Hydrolysis Of

scholarly journals Degradation Behavior of Copoly(succinic anhydride/ethylene oxide) in Soil or in Sea.

1998 ◽  
Vol 55 (3) ◽  
pp. 145-151 ◽  
Author(s):  
Yasukatsu MAEDA ◽  
Atsuyoshi NAKAYAMA ◽  
Terufumi TAKEUCHI ◽  
Mitsuya OGAWA ◽  
Norioki KAWASAKI ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Succinic Anhydride ◽  
Degradation Behavior

Synthesis and biodegradation of copolyesterether of copoly(succinic anhydride/ethylene oxide) with polyether

1998 ◽  
Vol 68 (13) ◽  
pp. 2095-2106 ◽  
Author(s):  
Y. Maeda ◽  
K. Sakai ◽  
A. Nakayama ◽  
I. Arvanitoyannis ◽  
N. Kawasaki ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Succinic Anhydride

Ring-opening copolymerization of succinic anhydride with ethylene oxide initiated by magnesium diethoxide

Polymer ◽  
1997 ◽  
Vol 38 (18) ◽  
pp. 4719-4725 ◽  
Author(s):  
Yasukatsu Maeda ◽  
Atsuyoshi Nakayama ◽  
Norioki Kawasaki ◽  
Kazuko Hayashi ◽  
Seiichi Aiba ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Ring Opening ◽  
Succinic Anhydride

The Structure of Radiation Cross-Linked Poly (ethylene oxide) Gels

1971 ◽  
Vol 29 ◽  
pp. 76-77
Author(s):  
C. E. Cluthe ◽  
G. G. Cocks
Keyword(s):  
Molecular Weight ◽  
Ethylene Oxide ◽  
Parallel Plate ◽  
Average Molecular Weight ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Nitrogen Gas ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Initial Viscosity

Aqueous solutions of a 1 weight-per cent poly (ethylene oxide) (PEO) were degassed under vacuum, transferred to a parallel plate viscometer under a nitrogen gas blanket, and exposed to Co60 gamma radiation. The Co60 source was rated at 4000 curies, and the dose ratewas 3.8x105 rads/hr. The poly (ethylene oxide) employed in the irradiations had an initial viscosity average molecular weight of 2.1 x 106.The solutions were gelled by a free radical reaction with dosages ranging from 5x104 rads to 4.8x106 rads.

Novel epoxy/anhydride alternatives for biological electron microscopy: Physical and performance characteristis of embed 812 and LX 112 in combination with NSA/NMA/DMAE

1989 ◽  
Vol 47 ◽  
pp. 1000-1001
Author(s):  
Joe A. Mascorro ◽  
Gerald S. Kirby
Keyword(s):  
Electron Microscopy ◽  
Flow Rate ◽  
Succinic Anhydride ◽  
Volume Flow Rate ◽  
Mass Density ◽  
Uranyl Acetate ◽  
Volume Flow ◽  
Base Resin ◽  
And Performance ◽  
Acid Anhydrides

Embedding media based upon an epoxy resin of choice and the acid anhydrides dodecenyl succinic anhydride (DDSA), nadic methyl anhydride (NMA), and catalyzed by the tertiary amine 2,4,6-Tri(dimethylaminomethyl) phenol (DMP-30) are widely used in biological electron microscopy. These media possess a viscosity character that can impair tissue infiltration, particularly if original Epon 812 is utilized as the base resin. Other resins that are considerably less viscous than Epon 812 now are available as replacements. Likewise, nonenyl succinic anhydride (NSA) and dimethylaminoethanol (DMAE) are more fluid than their counterparts DDSA and DMP- 30 commonly used in earlier formulations. This work utilizes novel epoxy and anhydride combinations in order to produce embedding media with desirable flow rate and viscosity parameters that, in turn, would allow the medium to optimally infiltrate tissues. Specifically, embeding media based on EmBed 812 or LX 112 with NSA (in place of DDSA) and DMAE (replacing DMP-30), with NMA remaining constant, are formulated and offered as alternatives for routine biological work.Individual epoxy resins (Table I) or complete embedding media (Tables II-III) were tested for flow rate and viscosity. The novel media were further examined for their ability to infilftrate tissues, polymerize, sectioning and staining character, as well as strength and stability to the electron beam and column vacuum. For physical comparisons, a volume (9 ml) of either resin or media was aspirated into a capillary viscocimeter oriented vertically. The material was then allowed to flow out freely under the influence of gravity and the flow time necessary for the volume to exit was recored (Col B,C; Tables). In addition, the volume flow rate (ml flowing/second; Col D, Tables) was measured. Viscosity (n) could then be determined by using the Hagen-Poiseville relation for laminar flow, n = c.p/Q, where c = a geometric constant from an instrument calibration with water, p = mass density, and Q = volume flow rate. Mass weight and density of the materials were determined as well (Col F,G; Tables). Infiltration schedules utilized were short (1/2 hr 1:1, 3 hrs full resin), intermediate (1/2 hr 1:1, 6 hrs full resin) , or long (1/2 hr 1:1, 6 hrs full resin) in total time. Polymerization schedules ranging from 15 hrs (overnight) through 24, 36, or 48 hrs were tested. Sections demonstrating gold interference colors were collected on unsupported 200- 300 mesh grids and stained sequentially with uranyl acetate and lead citrate.

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