PMID- 37112057
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20230501
IS  - 2073-4360 (Electronic)
IS  - 2073-4360 (Linking)
VI  - 15
IP  - 8
DP  - 2023 Apr 16
TI  - Chain Dynamics of Partially Disentangled UHMWPE around Melting Point 
      Characterized by (1)H Low-Field Solid-State NMR.
LID - 10.3390/polym15081910 [doi]
LID - 1910
AB  - Melts of ultrahigh molecular weight polyethylene (UHMWPE) entangled 
      significantly, suffering processing difficulty. In this work, we prepared 
      partially disentangled UHMWPE by freeze-extracting, exploring the corresponding 
      enchantment of chain mobility. Fully refocused (1)H free induction decay (FID) 
      was used to capture the difference in chain segmental mobility during the melting 
      of UHMWPE with different degrees of entanglement by low-field solid-state NMR. 
      The longer the polyethylene (PE) chain is in a less-entangled state, the harder 
      the process of merging into mobile parts after detaching from crystalline lamella 
      during melting. (1)H double quantum (DQ) NMR was further used to obtain 
      information caused by residual dipolar interaction. Before melting, the DQ peak 
      appeared earlier in intramolecular-nucleated PE than in intermolecular-nucleated 
      PE because of the strong constraints of crystals in the former one. During 
      melting, less-entangled UHMWPE could keep disentangled while less-entangled high 
      density polyethylene (HDPE) could not. Unfortunately, no noticeable difference 
      was found in DQ experiments between PE melts with different degrees of 
      entanglement after melting. It was ascribed to the small contribution of 
      entanglements compared with total residual dipolar interaction in melts. Overall, 
      less-entangled UHMWPE could reserve its disentangled state around the melting 
      point long enough to achieve a better way of processing.
FAU - Zhao, Yan
AU  - Zhao Y
AD  - Key Laboratory of High-Performance Polymer Materials and Technology of Ministry 
      of Education, Department of Polymer Science and Engineering, School of Chemistry 
      and Chemical Engineering, Nanjing University, Nanjing 210023, China.
FAU - Liang, Yuling
AU  - Liang Y
AD  - South China Advanced Institute for Soft Matter Science and Technology, School of 
      Emergent Soft Matter, South China University of Technology, Guangzhou 510640, 
      China.
FAU - Yao, Yingjie
AU  - Yao Y
AD  - Key Laboratory of High-Performance Polymer Materials and Technology of Ministry 
      of Education, Department of Polymer Science and Engineering, School of Chemistry 
      and Chemical Engineering, Nanjing University, Nanjing 210023, China.
FAU - Wang, Hao
AU  - Wang H
AD  - South China Advanced Institute for Soft Matter Science and Technology, School of 
      Emergent Soft Matter, South China University of Technology, Guangzhou 510640, 
      China.
FAU - Lin, Tong
AU  - Lin T
AD  - Key Laboratory of High-Performance Polymer Materials and Technology of Ministry 
      of Education, Department of Polymer Science and Engineering, School of Chemistry 
      and Chemical Engineering, Nanjing University, Nanjing 210023, China.
FAU - Gao, Yun
AU  - Gao Y
AD  - Key Laboratory of High-Performance Polymer Materials and Technology of Ministry 
      of Education, Department of Polymer Science and Engineering, School of Chemistry 
      and Chemical Engineering, Nanjing University, Nanjing 210023, China.
FAU - Wang, Xiaoliang
AU  - Wang X
AUID- ORCID: 0000-0001-7820-4706
AD  - Key Laboratory of High-Performance Polymer Materials and Technology of Ministry 
      of Education, Department of Polymer Science and Engineering, School of Chemistry 
      and Chemical Engineering, Nanjing University, Nanjing 210023, China.
FAU - Xue, Gi
AU  - Xue G
AD  - Key Laboratory of High-Performance Polymer Materials and Technology of Ministry 
      of Education, Department of Polymer Science and Engineering, School of Chemistry 
      and Chemical Engineering, Nanjing University, Nanjing 210023, China.
LA  - eng
GR  - 21790345, 22173046/National Natural Science Foundation of China/
PT  - Journal Article
DEP - 20230416
PL  - Switzerland
TA  - Polymers (Basel)
JT  - Polymers
JID - 101545357
PMC - PMC10142606
OTO - NOTNLM
OT  - UHMWPE
OT  - crystallization
OT  - entanglement
OT  - relaxation
OT  - solid-state NMR
COIS- The authors declare no conflict of interest.
EDAT- 2023/04/28 06:42
MHDA- 2023/04/28 06:43
PMCR- 2023/04/16
CRDT- 2023/04/28 01:49
PHST- 2023/03/20 00:00 [received]
PHST- 2023/04/09 00:00 [revised]
PHST- 2023/04/12 00:00 [accepted]
PHST- 2023/04/28 06:43 [medline]
PHST- 2023/04/28 06:42 [pubmed]
PHST- 2023/04/28 01:49 [entrez]
PHST- 2023/04/16 00:00 [pmc-release]
AID - polym15081910 [pii]
AID - polymers-15-01910 [pii]
AID - 10.3390/polym15081910 [doi]
PST - epublish
SO  - Polymers (Basel). 2023 Apr 16;15(8):1910. doi: 10.3390/polym15081910.