BANK • PEŁNY PODGLĄD

materiały: Environmental stress cracking

Fakty • wikipedia-seeded

← Bank
candidateneeds-reviewC 100%
Fakt używany przez pipeline
When Tg is approached, more fluid can permeate into the polymer chains.
Oryginalny claim Seekera
According to ASTM D883, stress cracking is defined as "an external or internal crack in a plastic caused by tensile stresses less than its short-term mechanical strength".
Pełniejszy materiał źródłowy / excerpt
Environmental Stress Cracking (ESC) is one of the most common causes of unexpected brittle failure of thermoplastic (especially amorphous) polymers known at present. According to ASTM D883, stress cracking is defined as "an external or internal crack in a plastic caused by tensile stresses less than its short-term mechanical strength". This type of cracking typically involves brittle cracking, with little or no ductile drawing of the material from its adjacent failure surfaces. Environmental stress cracking may account for around 15-30% of all plastic component failures in service. This behavior is especially prevalent in glassy, amorphous thermoplastics. Amorphous polymers exhibit ESC because of their loose structure which makes it easier for the fluid to permeate into the polymer. Amorphous polymers are more prone to ESC at temperature higher than their glass transition temperature (Tg) due to the increased free volume. When Tg is approached, more fluid can permeate into the polymer chains.
Kategoria: inne
Rodzina: inne
Jakość źródła: 65/100
Próby weryfikacji: 3
Notatka fact-checku: Fact-check 3.0-content-aware: no sufficient claim-bound corroboration after 3 healthy attempts. Scope=verify the factual claim. Required independent sources=2; stored evidence groups=1. Provider/API errors did not consume attempts. | Fact-check 4.3.2: research wznowiony bez zdejmowania HOLD. Poprzednia metoda: factcheck-300-content-aware. | Fact-check 4.3.2: research wznowiony bez zdejmowania HOLD. Poprzednia metoda: factcheck-weekly-research-432.

ŹRÓDŁA I DOWODY

5 zapisanych źródeł
Wikipedia ENPOTWIERDZAniezależne

Evidence: 100 • authority: 72

Environmental Stress Cracking (ESC) is one of the most common causes of unexpected brittle failure of thermoplastic (especially amorphous) polymers known at present. According to ASTM D883, stress cracking is defined as "an external or internal crack in a plastic caused by tensile stresses less than its short-term mechanical strength". This type of cracking typically involves brittle cracking, with little or no ductile drawing of the material from its adjacent failure surfaces. Environmental stress cracking may account for around 15-30% of all plastic component failures in service. This behavior is especially prevalent in glassy, amorphous thermoplastics. Amorphous polymers exhibit ESC beca…

Otwórz źródło ↗
American Chemical Society (ACS)pomocniczeniezależne

Evidence: 51 • authority: 80

Free-Surface Induced Tg Suppression of Simulated Polymer Chains

Otwórz źródło ↗
Elsevier BVpomocnicze

Evidence: — • authority: 80

Dynamic Monte Carlo study on the permeation of polymer chains through small holes

Otwórz źródło ↗
American Chemical Society (ACS)pomocnicze

Evidence: — • authority: 80

Permeation and Selective Retention of Solutes in PEGDA Hydrogel Membranes Containing Free Polymer Chains

Otwórz źródło ↗
Wikipedia ENpomocnicze

Evidence: — • authority: 72

Dextran is a complex branched glucan (polysaccharide derived from the condensation of glucose), originally derived from wine. IUPAC defines dextrans as "Branched poly-α-d-glucosides of microbial origin having glycosidic bonds predominantly C-1 → C-6". Dextran chains are of varying lengths (from 3 to 2000 kilodaltons). The polymer main chain consists of α-1,6 glycosidic linkages between glucose monomers, with branches from α-1,3 linkages. This characteristic branching distinguishes a dextran from a dextrin, which is a straight chain glucose polymer tethered by α-1,4 or α-1,6 linkages.

Otwórz źródło ↗