Today's KNOWLEDGE Share: The differences between thermoplastic and thermosetting plastics

-

Today's KNOWLEDGE Share:


What are the differences between thermoplastic and thermosetting plastics? 


The easy answer is that a thermoset plastic cannot be remolded after being cured, while a thermoplastic one can be reheated and remolded.




But why? 

As with many questions related to materials engineering, to answer that we have to zoom in a little bit and understand a bit more about chemistry at a molecular level. 


In a thermoplastic, strong bonds link monomers into polymer chains, however, these long monomers are joined to one another by weak bonds! These bonds can easily break apart when the plastic is heated and quickly reform again as it cools. 


Thermosetting plastics, on the other hand, have monomers that are cross-linked, thus, have extremely strong bonds! 

Polymer matrix composites can have either thermoplastic or thermoset matrices. 


Source:#managingcomposites

Visit MY BLOG http://polymerguru.blogspot.com


#composites #thermoplastic #thermoset


Comments

Post a Comment

Popular posts from this blog

Today's KNOWLEDGE Share:PLA BOTTLE

-
Image
Today's KNOWLEDGE Share Ever wondered how we can reduce plastic pollution in India? The Mysuru-based Defence Food Research Laboratory (DFRL), affiliated with the DRDO, has launched an eco-friendly remedy with the introduction of biodegradable water bottles. Crafted from sustainable Polylactic acid (PLA) material, these bottles not only combat plastic waste but also contribute to reducing the overall carbon footprint. The best thing about this bottle is its all-encompassing sustainability approach – the bottle, cap, and label are all compostable. This innovation, derived from 100% bio-based and renewable sources, sets us on a path towards environmental conservation and fosters a greener and more sustainable future. Source:The Better India #polymers #bioplastics #pla   #compostable   #ecofriendly   #sustainability
Read more

Opportunities in United States

-
Dear Members,  If you are looking for a new position in the United States,here are my personal recommendations to those who reside in the USA.  This portal is offering many roles from Junior to senior levels.You can stumble upon it to find a relevant position that suits your profile.  Pls visit the link:https://urbanlocalcmp.page.link/kEnz1gQdAmyySqrY8
Read more

Today's KNOWLEDGE Share:High and low shear rate changes in Rheology

-
Image
Today's KNOWLEDGE Share If a relatively high Mw grade flows from thin to thick, as shown in the picture, and if the time needed to fill the thick section is way shorter than the average polymer relaxation time, the polymer will not be able to reach its higher viscosity (corresponding to higher thickness/lower shear-rate). I am assuming here the polymer reached equilibrium low viscosity in the thin section, say for instance because it is much longer. Any pressure prediction not accounting for transient rheology would then overpredict the pressure to fill.Of course the diverging flow will further complicate the situation and mess with the molecular orientation created in the thin section, but to what extent ? Since this is more of a reasonable "conjecture", don't take this for granted, and discuss or share your opinion in the comments. There are hundreds of Rheology papers on the "4:1 contraction flow". Not sure I have ever seen any on the..."1:4 expansio
Read more