Heat resistance of triacetate fibre modified with added polyethylene glycol

1976 ◽  
Vol 8 (1) ◽  
pp. 68-70
Author(s):  
M. V. Polovnikova ◽  
V. I. Grabauskas ◽  
Z. Yu. Sakalauskas
Keyword(s):  
Polyethylene Glycol ◽  
Heat Resistance ◽  
Triacetate Fibre

scholarly journals The Effect of Mold Conditions on Heat Resistance of Injection-Molded Stereocomplex Polylactide-b-polyethylene Glycol-b-Polylactide Bioplastic

2021 ◽  
Vol 58 (3) ◽  
pp. 11-22
Author(s):  
Yodthong Baimark ◽  
Wuttipong Rungseesantivanon ◽  
Natcha Prakymoramas
Keyword(s):  
Polyethylene Glycol ◽  
Heat Resistance ◽  
Softening Temperature ◽  
Mold Temperature ◽  
Mechanical Analysis ◽  
Cooling Time ◽  
Degree Of Crystallinity ◽  
Scanning Calorimetry ◽  
Injection Molded ◽  
Good Heat

The effect of mold conditions was investigated in terms of mold temperature (30oC and 90oC) and cooling time (30 s and 60 s) on the heat resistance of injection-molded bars for stereocomplex polylactide-b-polyethylene glycol-b-polylactide (scPLA-PEG-PLA). Comparative study was performed for poly(L-lactide) (PLLA) and PLLA-b-PEG-b-PLLA (PLLA-PEG-PLLA). scPLA-PEG-PLA was 90/10 (w/w) PLLA-PEG-PLLA/poly(D-lactide) blend. scPLA-PEG-PLA exhibited the easiest crystallization upon cooling scan as shown by differential scanning calorimetry (DSC). Higher mold-temperature and longer cooling-time induced higher degree of crystallinity as assessed by X-ray diffractometry (XRD) except for PLLA bars. The heat resistance of both PLLA-PEG-PLLA and scPLA-PEG-PLA bars was improved with increased mold-temperature and cooling-time as shown by dynamic mechanical analysis (DMA), vicat softening temperature (VST) and heat distortion-resistance tests except for PLLA bars. In conclusion, the heat resistance of injection-molded bars prepared at 90˚C mold temperature was in the order scPLA-PEG-PLA ] PLLA-PEG-PLLA ] PLLA. The results suggested that flexible PLLA-PEG-PLLA and scPLA-PEG-PLA with high degrees of crystallinity were successfully obtained by injection molding for use as good heat-resistant bioplastic products.

Immunocytochemical detection of hepatic carbohydrate metabolic enzymes: Improved resolution with polyethylene glycol embedding and visio-bond semithin sections

1992 ◽  
Vol 50 (1) ◽  
pp. 792-793
Author(s):  
Kuixiong Gao ◽  
Randal E. Morris ◽  
Bruce F. Giffin ◽  
Robert R. Cardell
Keyword(s):  
Polyethylene Glycol ◽  
Glycogen Phosphorylase ◽  
Phosphoenolpyruvate Carboxykinase ◽  
Glycogen Synthase ◽  
Metabolic Enzymes ◽  
Silver Stain ◽  
Accurate Localization ◽  
Immunocytochemical Detection ◽  
Semithin Sections ◽  
Parenchymal Cells

Several enzymes are involved in the regulation of anabolic and catabolic pathways of carbohydrate metabolism in liver parenchymal cells. The lobular distribution of glycogen synthase (GS), phosphoenolpyruvate carboxykinase (PEPCK) and glycogen phosphorylase (GP) was studied by immunocytochemistry using cryosections of normal fed and fasted rat liver. Since sections of tissue embedded in polyethylene glycol (PEG) show good morphological preservation and increased detectability for immunocytochemical localization of antigenic sites, and semithin sections of Visio-Bond (VB) embedded tissue provide higher resolution of cellular structure, we applied these techniques and immunogold-silver stain (IGSS) for a more accurate localization of hepatic carbohydrate metabolic enzymes.

Directional observation on lipid of male nectary of Lindera megaphylla hemsl. by the rapid embedding method with polyethylene glycol (PEG)

1990 ◽  
Vol 48 (3) ◽  
pp. 718-719
Author(s):  
Dai Dalin ◽  
Guo Jianmin
Keyword(s):  
Electron Microscope ◽  
Polyethylene Glycol ◽  
Chemical Reaction ◽  
Traditional Method ◽  
Osmium Tetroxide ◽  
Unsaturated Lipid ◽  
Embedding Method ◽  
Long Period ◽  
New Methods

Lipid cytochemistry has not yet advanced far at the EM level. A major problem has been the loss of lipid during dehydration and embedding. Although the adoption of glutaraldehyde and osmium tetroxide accelerate the chemical reaction of lipid and osmium tetroxide can react on the double bouds of unsaturated lipid to from the osmium black, osmium tetroxide can be reduced in saturated lipid and subsequently some of unsaturated lipid are lost during dehydration. In order to reduce the loss of lipid by traditional method, some researchers adopted a few new methods, such as the change of embedding procedure and the adoption of new embedding media, to solve the problem. In a sense, these new methods are effective. They, however, usually require a long period of preparation. In this paper, we do research on the fiora nectary strucure of lauraceae by the rapid-embedding method wwith PEG under electron microscope and attempt to find a better method to solve the problem mentioned above.

279: Inhibition of Cyclooxygenase-2 Pathway Overcomes the Heat-Resistance in Prostate Cancer Cells

2007 ◽  
Vol 177 (4S) ◽  
pp. 93-93
Author(s):  
Makoto Sumitomo ◽  
Kenji Kuroda ◽  
Takako Asano ◽  
Akio Horiguchi ◽  
Keiichi Ito ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Heat Resistance ◽  
Cancer Cells ◽  
Cyclooxygenase 2 ◽  
Prostate Cancer Cells

Polyethylene Glycol Tx Aids Chronic Constipation

2008 ◽  
Vol 42 (2) ◽  
pp. 48
Author(s):  
DOUG BRUNK
Keyword(s):  
Polyethylene Glycol ◽  
Chronic Constipation

Polyethylene glycol-mediated direct gene transfer in Nicotiana spp.

1992 ◽  
Vol 85 (2) ◽  
pp. 345-351 ◽  
Author(s):  
Gokarna B. Gharti-Chhetri ◽  
Wichai Cherdshewasart ◽  
Jocelyne Dewulf ◽  
Michel Jacobs ◽  
loan Negrutiu
Keyword(s):  
Polyethylene Glycol ◽  
Gene Transfer ◽  
Direct Gene Transfer ◽  
Direct Gene

TWO LITERS OF POLYETHYLENE GLYCOL (PEG) WITH 15 MG OF BISACODYL VERSUS 4 LITERS OF PEG FOR BOWEL PREPARATION TO COLONOSCOPY

2018 ◽  
Author(s):  
A Elmekkaoui ◽  
M Oualgouh ◽  
A Zazour ◽  
W Khannoussi ◽  
G Kharrasse ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Bowel Preparation
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