PMID- 18465939
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20080721
LR  - 20080509
IS  - 0021-9606 (Print)
IS  - 0021-9606 (Linking)
VI  - 128
IP  - 17
DP  - 2008 May 7
TI  - Unexpected molecular weight dependence of shish-kebab structure in the oriented 
      linear low density polyethylene/high density polyethylene blends.
PG  - 174902
LID - 10.1063/1.2904561 [doi]
AB  - In this study, highly oriented shish-kebab structure was achieved via imposing 
      oscillatory shear on the melts of linear low density polyethylene (LLDPE)/high 
      density polyethylene (HDPE) blends during the packing stage of injection molding. 
      To investigate the effect of molecular weight of HDPE on the formation of 
      shish-kebab structure, two kinds HDPE with large melt flow index (low molecular 
      weight) and small melt flow index (high molecular weight) were added into LLDPE 
      matrix. The structural characteristics of LLDPE/HDPE blends were systematically 
      elucidated through two-dimensional wide-angle x-ray scattering, scanning electron 
      microscopy, and differential scanning calorimetry. Interestingly, an unexpected 
      molecular weight dependence of shish-kebab structure of the prepared samples was 
      found that the addition of HDPE with low molecular weight resulted in an higher 
      degree of orientation, better regularity of lamellar arrangement, thicker 
      lamellar size, and higher crystal melting temperature than that adding HDPE with 
      high molecular weight. Correspondingly, the blend containing low molecular weight 
      HDPE had better tensile strength. A possible mechanism was suggested to elucidate 
      the role of HDPE molecular weight on the formation of shish-kebab structure in 
      the oriented blends, considering the change of chain mobility and entanglement 
      density with change of molecular weight.
FAU - Liang, Si
AU  - Liang S
AD  - Department of Polymer Science and Materials, State Key Laboratory of Polymer 
      Materials Engineering, Sichuan University, Chengdu 610065, People's Republic of 
      China.
FAU - Wang, Ke
AU  - Wang K
FAU - Tang, Changyu
AU  - Tang C
FAU - Zhang, Qin
AU  - Zhang Q
FAU - Du, Rongni
AU  - Du R
FAU - Fu, Qiang
AU  - Fu Q
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Chem Phys
JT  - The Journal of chemical physics
JID - 0375360
EDAT- 2008/05/10 09:00
MHDA- 2008/05/10 09:01
CRDT- 2008/05/10 09:00
PHST- 2008/05/10 09:00 [pubmed]
PHST- 2008/05/10 09:01 [medline]
PHST- 2008/05/10 09:00 [entrez]
AID - 10.1063/1.2904561 [doi]
PST - ppublish
SO  - J Chem Phys. 2008 May 7;128(17):174902. doi: 10.1063/1.2904561.