By Alejandro J. Müller, Vittoria Balsamo, María Luisa Arnal (auth.), Volker Abetz (eds.)
"Block coplolymers were studied for a number of many years, a interval that has been punctuated through a couple of books and assessment articles at the subject. regardless of this background, the topic is way from exhausted and, if something, has skilled a robust renewal lately. This has been speartheaded through an enormous number of new block copolymers, the $64000 improvement of robust visualization recommendations, AFM specifically, that experience develop into on hand, in addition to motivating visions of nanotechnological applications.
In this context, this new two-volume ebook, with its concentrate on the latest advancements within the zone, is well timed. ...."
"These volumes might be thought of vital through any newcomer to the sector and may represent an invaluable refererence to many already within the field."
from: C.G. Bazuin, Université de Montréal, J. Am. Chem. Soc. 2006, 128 S. 9980-9981
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Additional resources for Block Copolymers II
J. Müller et al. ders. They have also explored the inﬂuence of the conﬁnement level on the crystallization kinetics of PE-b-poly(vinylcyclohexane) (PE-b-PVCH) diblock copolymers . , n > 1) is obtained for the highly interconnected gyroid structure and in some cases for lamellar diblocks which have defects that cause certain interconnectivity. , that the crystal growth must be essentially instantaneous within spherical or cylindrical domains and homogeneous nucleation is the rate-determining step in the crystallization.
These copolymers have been prepared with a wide composition range (with PCL contents from 11 to 77%) and they have been compared with PS-b-PCL and PB-b-PCL diblock copolymers [29, 98, 115–118]. Calorimetric measurements and morphological observations showed that PS-b-PCL, PB-b-PCL and PS-b-PB-b-PCL copolymers exhibit microphase separation and crystallization if the molecular weight is high enough. Only in PS-b-PCL diblock copolymers, a shift of the PS glass transition to lower temperatures has been observed.
The overall isothermal crystallization kinetics of polymers can be described by the Avrami equation [88–90]: 1 – vc = exp(– Kt n ) , (7) where n is the Avrami index, a parameter that indicates the dimensionality of growth together with nucleation type, K is the overall relative transformation rate constant (its value includes contributions from both nucleation and growth) and vc is the relative volume crystalline fraction (its value ranging from 0 to 1; therefore, it is a normalized value with respect to the maximum crystallinity achieved during the crystallization time employed).