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PREP_mc2 Frequently Asked Questions

We are aware that acquiring a lab instrument is an important decision, furthermore if Polyolefins’ research is related with your core business.

Although you can ask directly to our consultants whenever you want, you may prefer to know first the answers to the most typical questions about our instruments. Here are packed the most relevant questions about PREP mc2.


Questions


Answers

Which is the purpose of PREP mc2 instrument?
PREP mc2 is a preparative instrument intended to fractionate polymers by Molar Mass or by Composition (TREF or CRYSTAF modes) with no hot solvents handling.

Does PREP mc2 provide the physical fractions?
Yes, it will provide the different fractions corresponding to the temperature steps selected if fractionation method is by composition; or will provide fractions with different molar mass cuts, if fractionation method by molar mass is chosen before the run has started.

Does PREP mc2 provide any analytical result or curves?
No, it doesn’t. PREP mc2 is a preparative instrument and no detector is incorporated in it. Thus, no analytical result is provided as its purpose is to fractionate polymers and to obtain physical fractions.

How many samples can be fractionated at a time?
Two different samples can be fractionated at a time in Molar Mass mode and in TREF mode. One sample at a time can be fractionated in CRYSTAF mode.

How many grams can be fractionated at once?
In Molecular Weight fractionation, up to 2 grams can be put into each vessel and in composition around 1.5g per vessel.

PREP instrument has two vessels available; therefore, if a larger sample needs to be fractionated, both vessels can be run at the same time with the same sample.

How many fractions can be obtained from a parent sample?
The maximum number of fractions that can be obtained by PREP mc2 is 16 fractions as per the PREP’s sample collector specifications.

How narrow can the resulting fractions become?
For 6 to 8 fractions, polidispersity obtained in a molar mass fractionation is around 2.

Which solvents can be used?
Any solvent compatible with viton o’rings and sealings can be used. To fractionate polyolefin samples, the solvents mostly used are TCB, oDCB and DEGMBE.

What kind of sample preparation is required by the user?
No samples preparation is required by the user but weighing the dry samples and putting them inside of the vessels. The rest of the steps are performed by the instrument automatically: vessels filling, dissolution, filtration to the samples collector, final cleaning, etc.

How are the fractions recovered after the automated fractionation process?
After the automated fractionation process, fractions will be found in the sample collector separated in different glass vessels and mixed with solvent. By using any standard filtration system, fractions can be separated from the solvent and dried, to become ready to be weighted and analyzed by GPC, TREF, CRYSTAF, DSC, NMR, etc.

Do I need to handle solvents?
Solvents just need to be handled after the fractionation process, which is completely performed by the instrument.

After the automated fractionation process, fractions will be found in the sample collector separated in different glass vessels and mixed with solvent. By using any simple filtration system, fractions can be separated from the solvent and dried, to become ready to be weighted and analyzed by GPC, TREF, CRYSTAF, DSC, NMR, etc.

Which kind of polymers can be fractionated?
PREP mc2 has been used to fractionate polyolefin mainly, but any polymeric sample might be fractionated by using any compatible solvent. Please check question 8: ‘Which solvents can be used?’.

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