By Siripon Anantawaraskul, João B. P. Soares (auth.)
"This quantity is split into 4 sections, each one treating specific methods to the charakterization of polymers. ...Although the 4 sections are usually not both via, all supply an outline of the actual sector and may be priceless to these new to the sector in addition to to present practitioners. All 4 sections include listings of diverse references. Many are citations of modern paintings and may let these drawn to a specific strategy to fast achieve entry to an important reports."
from: J. Am. Chem. Soc. 2006,128, 12030
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Additional info for Polymer Analysis Polymer Theory
The Crystaf results of these blends indicated that the comonomer type of the parent samples did not appreciably inﬂuence their cocrystallization behavior, as illustrated in Fig. 39. Polymer Fractionation by Crystaf and Tref 39 Fig. 1 ◦ C/min for blends with the same comonomer type. BPED blend of ethylene/1-dodecene copolymers, BPEO blend of ethylene/1-octene copolymers; BPEH blend of ethylene/1-hexene copolymers, BPEP blend of ethylene/propylene copolymers  40 S. Anantawaraskul et al. 1 Estimation of CC and CCD of Copolymers One of the main applications of Crystaf analysis is the estimation of the CCD of semicrystalline copolymers, speciﬁcally LLDPE.
Prior to the fractionation or crystallization step, the polymer sample is dissolved at high temperature in a good solvent inside a crystallization vessel to ensure complete dissolution. For analyzing polyoleﬁns, 1,2,4-tricholobenzene is generally the solvent of choice. 5 mg/mL) are recommended to avoid effects from chain-to-chain interactions and cocrystal- 28 S. Anantawaraskul et al. 1 mg/mL) might lead to poor resolution owing to low signal-to-noise ratios. The dissolution step is followed by the stabilization period, when the temperature of the polymer solution is kept a few degrees above the initial crystallization temperature.
Equation 8 is very useful to represent the effect of multiplicity of active sites on the CCD, but other alternative models are also possible . Since Eq. 8 permits the most straightforward description for the CCD of polymers made with multiple-site catalysts, it will be the only model used in this review to illustrate Tref and Crystaf fractionation. Figure 23 shows a simulated Tref proﬁle for a LLDPE model sample made with a ﬁve-site-type catalyst . By solving the inverse problem, this approach has been used to deconvolute experimental Tref proﬁles and provide information on the number of active-site types present on the catalyst (Fig.