Thermal aging study of carboxyl-terminated polybutadiene and poly(butadiene-acrylonitrile)-reactive liquid polymers

1983 ◽  
Vol 23 (4) ◽  
pp. 222-225 ◽  
Author(s):  
Y. Okamoto
Keyword(s):  
Thermal Aging ◽  
Liquid Polymers ◽  
Aging Study ◽  
Reactive Liquid

Amine Terminated Reactive Liquid Polymers; Modification of Thermoset Resins

1981 ◽  
Vol 54 (2) ◽  
pp. 374-402 ◽  
Author(s):  
C. K. Riew
Keyword(s):  
Molecular Weight ◽  
Elevated Temperatures ◽  
Average Molecular Weight ◽  
Impact Resistance ◽  
Secondary Amide ◽  
Amine Group ◽  
Low Viscosity ◽  
End Groups ◽  
Liquid Polymers ◽  
Reactive Liquid

Abstract Amine terminated reactive liquid polymers (AT-RLP) are synthesized from corresponding carboxyl terminated reactive liquid polymers (CT-RLP) and diamines. The CT-RLPs have a functionality of close to two, the average molecular weight ranging from 2500 to 4000, and Brookfield viscosity ranging from 30 to 600 Pa · s at 27°C. AT-RLPs made from the CT-RLPs have about the same physical properties as the CT-RLPs given above. N-(2-aminoethyl)piperazine (AEP2) is the best diamine among the diamines tried to produce low viscosity and low molecular weight AT-RLPs. Structure of end-groups of AT-RLP is unequivocally identified as a secondary amide and a secondary amine group resulting from the reaction of carboxyl end-groups of CT-RLP and a primary amine group of AEP,. The AT-RLP can be used as a modifier for epoxy resins at room or elevated temperatures to produce castable formulations with properties ranging from plastics to elastomers. The formulations may be useful as a modifier for improvement of crack and/or impact resistance of normally brittle epoxy plastics, as castable elastomers, paints and coatings, sealants, adhesives, especially as solventless adhesives for conveyor belts, hoses, shoes, and as binders for woven or non-woven fibers and cords.

Reactive liquid polymers of propylene sulphide

1971 ◽  
Vol 7 (2) ◽  
pp. 189-201 ◽  
Author(s):  
D.A. MacKillop ◽  
D.R. Morgan ◽  
R.T. Woodhams
Keyword(s):  
Liquid Polymers ◽  
Reactive Liquid

Thermal Aging Study of Tin plating on Aluminum

2007 ◽  
Author(s):  
Bella Chudnovsky ◽  
Vincent Pavageau ◽  
Michel Rapeaux ◽  
Ali Zolfaghari ◽  
Pierre Bardollet
Keyword(s):  
Thermal Aging ◽  
Aging Study ◽  
Tin Plating

scholarly journals Thermal Aging Study of a Dow Corning SE 1700 Porous Structure Made by Direct Ink Writing: 1-Year Results and Long-Term Predictions

2015 ◽  
Author(s):  
Ward Small ◽  
Mark A. Pearson ◽  
Amitesh Maiti ◽  
Thomas R. Metz ◽  
Eric B. Duoss ◽  
...  
Keyword(s):  
Porous Structure ◽  
Thermal Aging ◽  
Direct Ink Writing ◽  
Aging Study

scholarly journals THERMAL AGING STUDY OF BIODEGRADABLE POLYMER MATERIALS BY DIELECTRIC THERMAL ANALYSIS

2018 ◽  
Vol 4 (7) ◽  
Author(s):  
Aleksandra Porjazoska Kujundziski ◽  
Dragica Chamovska
Keyword(s):  
Lactic Acid ◽  
Thermal Aging ◽  
Polymer Materials ◽  
Dielectric Losses ◽  
Phase Lag ◽  
Heating Rates ◽  
Vacuum Oven ◽  
Molecular Weights ◽  
Aging Study ◽  
Dielectric Thermal Analysis

Two different studies of the thermal aging of polyesters based on lactic and glycolic acidswere compared. Thermal degradation of poly(L-lactic acid) (PLLA), poly(L-lactic acid-co-glycolicacid) (PLLGA) and poly(DL-lactic acid-co-glycolic acid) (PDLGA) was studied by the dielectricthermal analysis (DETA). The aging was performed at 37C in vacuum oven. The dielectric featuresi.e., dielectric permittivity,, dielectric losses,, and phase lag, tg , were determined by PL-DETAcontaining a parallel plate capacitance cell, from the room temperature to 80, 150, and 180  C,at the heating rates of 2 and 3 Cmin-1. Dielectric scans were obtained at a frequency of 1 kHz anda.c. signal of 200 mV. Different behavior of PLLA, PLLGA, and PDLGA during degradation wasobserved. As the aging of PDLGA proceeds, dielectric losses shift to the lower temperatures,indicating existence of lower molecular weights.  - T, and tg  - T dependences of PLLGA, as wellas those for PLLA show two simultaneous processes occurring, crystallization and degradation.

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