PMID- 21366212
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20110826
LR  - 20110317
IS  - 1520-5207 (Electronic)
IS  - 1520-5207 (Linking)
VI  - 115
IP  - 11
DP  - 2011 Mar 24
TI  - Critical analysis of the crystal orientation behavior in polyethylene-based 
      crystalline-amorphous diblock copolymer.
PG  - 2494-502
LID - 10.1021/jp1103565 [doi]
AB  - Orientation of polyethylene (PE) crystals formed over a broad range of 
      undercooling in a polyethylene-block-poly(D,L-lactide) (PE-b-PDLLA) diblock 
      copolymer has been critically examined. Due to the large segregation strength and 
      approximate 50/50 composition in this system, the crystallization took place 
      within one-dimensionally confined lamellar microdomains without forming 
      spherulites. A homogeneous crystal orientation with the PE crystalline stems 
      orienting parallel to the lamellar interface was observed at crystallization 
      temperatures (T(c)) between 45 and 102  degrees C. Once the sample was crystallized at 
      T(c) </= 40  degrees C or directly quenched into liquid nitrogen from the melt, the 
      isotropic WAXD pattern indicated that the PE crystals became randomly oriented. 
      Considering that homeotropic orientation was not identified for the present 
      system and other PE-based crystalline-amorphous diblocks, we concluded that PE 
      crystals in the lamellar microdomains always show homogeneous orientation when 
      there is a preferred orientational order. We further organized the thermodynamic 
      and kinetic factors that may govern the preferred crystal orientation in diblock 
      copolymers and concluded that the orientational order should be controlled by the 
      competition between nucleation and crystal growth kinetics. The persistence of 
      homogeneous orientation of PE was attributed to its excellent nucleating power.
CI  - (c) 2011 American Chemical Society
FAU - Lin, Ming-Champ
AU  - Lin MC
AD  - Department of Chemical Engineering, National Tsing Hua University, Hsin-Chu 
      30013, Taiwan.
FAU - Wang, Yi-Chin
AU  - Wang YC
FAU - Chen, Hsin-Lung
AU  - Chen HL
FAU - Muller, Alejandro J
AU  - Muller AJ
FAU - Su, Chun-Jen
AU  - Su CJ
FAU - Jeng, U-Ser
AU  - Jeng US
LA  - eng
PT  - Journal Article
DEP - 20110302
PL  - United States
TA  - J Phys Chem B
JT  - The journal of physical chemistry. B
JID - 101157530
EDAT- 2011/03/04 06:00
MHDA- 2011/03/04 06:01
CRDT- 2011/03/04 06:00
PHST- 2011/03/04 06:00 [entrez]
PHST- 2011/03/04 06:00 [pubmed]
PHST- 2011/03/04 06:01 [medline]
AID - 10.1021/jp1103565 [doi]
PST - ppublish
SO  - J Phys Chem B. 2011 Mar 24;115(11):2494-502. doi: 10.1021/jp1103565. Epub 2011 
      Mar 2.