PMID- 27590085
OWN - NLM
STAT- MEDLINE
DCOM- 20170106
LR  - 20181202
IS  - 1873-3778 (Electronic)
IS  - 0021-9673 (Linking)
VI  - 1465
DP  - 2016 Sep 23
TI  - Separating effective high density polyethylene segments from olefin block 
      copolymers using high temperature liquid chromatography with a preloaded discrete 
      adsorption promoting solvent barrier.
PG  - 107-16
LID - S0021-9673(16)31132-3 [pii]
LID - 10.1016/j.chroma.2016.08.055 [doi]
AB  - Recent advances in catalyst technology have enabled the synthesis of olefin block 
      copolymers (OBC). One type is a "hard-soft" OBC with a high density polyethylene 
      (HDPE) block and a relatively low density polyethylene (VLDPE) block targeted as 
      thermoplastic elastomers. Presently, one of the major challenges is to 
      fractionate HDPE segments from the other components in an experimental OBC sample 
      (block copolymers and VLDPE segments). Interactive high temperature liquid 
      chromatography (HTLC) is ineffective for OBC separation as the HDPE segments and 
      block copolymer chains experience nearly identical enthalpic interactions with 
      the stationary phase and co-elute. In this work we have overcome this challenge 
      by using liquid chromatography under the limiting conditions of desorption (LC 
      LCD). A solvent plug (discrete barrier) is introduced in front of the sample 
      which specifically promotes the adsorption of HDPE segments on the stationary 
      phase (porous graphitic carbon). Under selected thermodynamic conditions, VLDPE 
      segments and block copolymer chains crossed the barrier while HDPE segments 
      followed the pore-included barrier solvent and thus enabled separation. The 
      barrier solvent composition was optimized and the chemical composition of 
      fractionated polymer chains was investigated as a function of barrier solvent 
      strength using an online Fourier-transform infrared (FTIR) detector. Our study 
      revealed that both the HDPE segments as well as asymmetric block copolymer chains 
      (HDPE block length>>VLDPE block length) are retained in the separation and the 
      barrier strength can be tailored to retain a particular composition. At the 
      optimum barrier solvent composition, this method can be applied to separate 
      effective HDPE segments from the other components, which has been demonstrated 
      using an experimental OBC sample.
CI  - Copyright (c) 2016 Elsevier B.V. All rights reserved.
FAU - Chatterjee, Tirtha
AU  - Chatterjee T
AD  - Materials Science and Engineering, The Dow Chemical Company, Midland, MI 48674, 
      United States. Electronic address: tchatterjee@dow.com.
FAU - Rickard, Mark A
AU  - Rickard MA
AD  - Analytical Sciences, The Dow Chemical Company, Midland, MI 48667, United States.
FAU - Pearce, Eric
AU  - Pearce E
AD  - Analytical Sciences, The Dow Chemical Company, Midland, MI 48667, United States.
FAU - Pangburn, Todd O
AU  - Pangburn TO
AD  - Analytical Sciences, The Dow Chemical Company, Midland, MI 48667, United States.
FAU - Li, Yongfu
AU  - Li Y
AD  - Analytical Sciences, The Dow Chemical Company, Midland, MI 48667, United States.
FAU - Lyons, John W
AU  - Lyons JW
AD  - Analytical Sciences, The Dow Chemical Company, Midland, MI 48667, United States.
FAU - Cong, Rongjuan
AU  - Cong R
AD  - Performance Plastics Characterization, The Dow Chemical Company, 2301 Brazosport 
      Blvd., Freeport, TX 77541, United States.
FAU - deGroot, A Willem
AU  - deGroot AW
AD  - Performance Plastics Characterization, The Dow Chemical Company, 2301 Brazosport 
      Blvd., Freeport, TX 77541, United States.
FAU - Meunier, David M
AU  - Meunier DM
AD  - Analytical Sciences, The Dow Chemical Company, Midland, MI 48667, United States. 
      Electronic address: dmeunier@dow.com.
LA  - eng
PT  - Journal Article
DEP - 20160826
PL  - Netherlands
TA  - J Chromatogr A
JT  - Journal of chromatography. A
JID - 9318488
RN  - 0 (Alkenes)
RN  - 0 (Polymers)
RN  - 0 (Solvents)
RN  - 9002-88-4 (Polyethylene)
SB  - IM
MH  - Adsorption
MH  - Alkenes/chemistry
MH  - *Chromatography, High Pressure Liquid
MH  - Polyethylene/*chemistry/isolation & purification
MH  - Polymers/*chemistry/isolation & purification
MH  - Porosity
MH  - Solvents/*chemistry
MH  - Spectroscopy, Fourier Transform Infrared
MH  - Temperature
OTO - NOTNLM
OT  - Adsorption
OT  - HTLC
OT  - LC-FTIR
OT  - Olefin block copolymers (OBC)
EDAT- 2016/09/04 06:00
MHDA- 2017/01/07 06:00
CRDT- 2016/09/04 06:00
PHST- 2016/07/11 00:00 [received]
PHST- 2016/08/22 00:00 [revised]
PHST- 2016/08/25 00:00 [accepted]
PHST- 2016/09/04 06:00 [entrez]
PHST- 2016/09/04 06:00 [pubmed]
PHST- 2017/01/07 06:00 [medline]
AID - S0021-9673(16)31132-3 [pii]
AID - 10.1016/j.chroma.2016.08.055 [doi]
PST - ppublish
SO  - J Chromatogr A. 2016 Sep 23;1465:107-16. doi: 10.1016/j.chroma.2016.08.055. Epub 
      2016 Aug 26.