The video is very much informative. I really appreciate your efforts.
@asalpeydaei58542 жыл бұрын
very informative presentation. Thank you
@PolymerWorld2 жыл бұрын
Thanks for the feedback. Glad it was helpful.
@Star_worth3 ай бұрын
Great vdo ..nice explanation
@jess9113 жыл бұрын
Thank you, very helpful overview keep up the good work!! :)
@PRADEEPKUMAR-kp9il5 жыл бұрын
good
@ammarn36015 жыл бұрын
very nice explanation. would you please tell the effect on Impact strength and strength when crystallinity of polymer increased
@PolymerWorld5 жыл бұрын
Mostly impact strength will decrease with increasing crystallinity sincere there will be less number of chains in the amorphous region which will resist crack propagation in case of impact test (no chain mobility and slippage). But tensile strength will increase with increasing crystallinity upto certain point. During tensile test, sample breaks by both chain breakage and slippage, since crystals acts as a physical crosslinking points and leads to formation of interconnected network, chain slippage decreases with increasing crystallinity and thus requires more energy to break. So tensile strength will increase with increasing crystallinity. At extremely high crystallinity polymer will show lower strength. The reason is at low to medium amount of crystallinity, one chain will pass through a number of crystals thus will form a highly interconnected network but at high crystallinity one chain will pass through only few crystals therefore interconnected network will not exist and thus crack can propagate without breaking large number of chains therefore it will show lower strength.
@ajosefrancos66944 жыл бұрын
Great video, thanks for sharing this awesome knowledge.
@PolymerWorld4 жыл бұрын
Thanks for your feedback!
@ebamala36755 жыл бұрын
thanks a lot! It was a good presentation!!
@PolymerWorld5 жыл бұрын
Thanks for watching!
@ThanhNguyen-pw3xb4 жыл бұрын
Diamond is transparent but it has crystal structure. Please give an explanation!
@PolymerWorld4 жыл бұрын
To make something opaque, we need free electron to absorb light or interface (between amorphous/crystalline, water/air etc.) to reflect or refract light. As all electrons in diamond is used in forming covalent bond, it can not absorb light and also it is completely crystalline so there is no interface making it highly transparent.
@BrijeshKhumaar5 жыл бұрын
Excellent explanation thanks
@PolymerWorld5 жыл бұрын
Thanks for your feedback!
@kavyav93444 жыл бұрын
Very helpful video, please do a video about XRD
@ameerah38099 ай бұрын
I wish you could add captions to your videos
@PolymerWorld9 ай бұрын
Thanks for watching the video. Subtitle is added.
@mdreazulislam39452 жыл бұрын
Thanks. Can you please tell, is there any way that the Crystallization temperature of a polymer is higher than its Melting temperature? How are these two related?
@PolymerWorld2 жыл бұрын
Crystallization temperature can not be higher than melting temperature. At melting temperature rate of crystallization is always zero.
@amalmelhem34993 жыл бұрын
thank you for this great video, it helped me a lot
@johnturman55852 жыл бұрын
This is excellent
@PolymerWorld2 жыл бұрын
Thanks for the feedback.
@farnooshebrahimi76024 жыл бұрын
very useful information. Thanks!
@PolymerWorld4 жыл бұрын
Glad you enjoyed it!
@alexh31605 жыл бұрын
Helped a lot
@PolymerWorld5 жыл бұрын
Thanks for the feedback!
@armanhamza75723 жыл бұрын
why the melt temperature of beta iPP is 12-15 C less than alpha iPP?
@PolymerWorld3 жыл бұрын
The alpha form is more stable than beta form since beta form remain in a thermodynamically metastable state therefore alpha iPP shows higher melting temperature. To learn more please consult this paper "Orientation-induced crystallization of isotactic polypropylene, by Q. Liu et al. (2013).
@ahmedtaha5033 жыл бұрын
Thank you
@AbhishekThakur-of5bu3 жыл бұрын
The crystallinity of the polymer doesn't decides the transparency of the polymer.
@PolymerWorld3 жыл бұрын
Amorphous polymers (no or little crystalline) are transparent and crystalline polymers are opaque in nature. With increasing crystallinity transparency of a polymer decreases and opacity increases.
@user-qt9tl6bu9n22 күн бұрын
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@blakehussey5 жыл бұрын
Great video, but it’s time to change the battery in your smoke detector 😁