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 by means of a few books and overview articles at the subject. regardless of this heritage, the topic is way from exhausted and, if something, has skilled a powerful renewal lately. This has been speartheaded by way of an unlimited number of new block copolymers, the $64000 improvement of strong visualization recommendations, AFM particularly, that experience develop into available, in addition to motivating visions of nanotechnological applications.
In this context, this new two-volume e-book, with its specialise in the newest advancements within the sector, is well timed. ...."
"These volumes could be thought of necessary by way of 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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Extra info for Block Copolymers II
For homogeneous nucleation to take place, several requirements should be met: 1. The number of isolated MDs should be much larger than the usual number of active heterogeneities present in an equivalent bulk sample of the crystallizable polymer. 2. The MD structures should not contain any other type of less efﬁcient heterogeneities present that could be activated in the absence of the heterogeneities that cause nucleation at the usual supercooling range in the bulk polymer. 3. The interphases between MDs should not be able to cause nucleation of the semicrystalline phase.
48. In this case, the crystallization of the PE block occurs with a molten aPP block covalently bonded to it. The components are reported to be in the strong segregation limit and therefore are phase-separated well before crystallization. They found that the crystallization kinetics (as determined by small-angle light scattering) was substantially retarded compared with that of an equivalent molecular weight PE homopolymer. They Nucleation and Crystallization in Diblock and Triblock Copolymers 33 attributed the effect to a mobility reduction for the chains close to the interfacial region and to the presence of the noncrystallizable aPP chains close to the growth face which could obstruct the growth process.
For ABC triblock copolymers, Müller et al. , Schmalz et al. [101, 119] and Balsamo et al. J. Müller et al. crystallization does not show any strong dependence of the morphological features of the MD and of the molecular weight of the crystallizable block (Table 4). 3 ◦ C, respectively. 7 ◦ C). In the same way, B11 I70 EO19 , B17 I57 EO26 and B24 I56 EO20 , which have PEO molecular masses of 22 800, 13 400 and 33 800 g mol–1 , have at least a crystallization exotherm at temperatures as low as – 23, – 25 and – 21 ◦ C, respectively.