scispace - formally typeset
Search or ask a question
Topic

Norbornene

About: Norbornene is a research topic. Over the lifetime, 5628 publications have been published within this topic receiving 104495 citations. The topic is also known as: norbornylene & norcamphene.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, a ring-opening metathesis polymerization (ROMP) from a new norbornene derivative (NBPYTPAM) using Grubbs' catalyst and followed by hydrogen reduction was performed.
Abstract: Novel electrochromic polynorbornenes poly(NBPYTPAM) and poly(HNBPYTPAM), containing electroactive chromophores, were prepared via ring-opening metathesis polymerization (ROMP) from a new norbornene derivative (NBPYTPAM) using Grubbs’ catalyst and followed by hydrogen reduction. The glass transition temperatures (Tg) of poly(NBPYTPAM) and hydrogenated poly(HNBPYTPAM) were 190 and 175 °C, respectively. The cyclic voltammogram of the poly(HNBPYTPAM) film cast onto flexible graphene-coated polyethylene terephthalene (PET) substrates exhibited two reversible oxidation redox couples at 1.0 and 1.9 V. Flexible electrochromic devices were fabricated from the electroactive polymers and graphene-coated PET substrates. The electrochromic characteristics of poly(HNBPYTPAM) showed excellent stability and reversibility, with multistaged color changes from its yellow neutral form to green and then to dark-blue.

46 citations

Journal ArticleDOI
TL;DR: In this paper, a nearly alternating copolymer with a dihydrotricyclopentadiene (HTCPD) content of 45 mol % was obtained with a satisfactory activity (4.7 × 106 g/(mol Ti h)), of which Tg was 177 °C, significantly higher than that of norbornene/ethylene copolymers at the same cycloolefin content.
Abstract: Regioselective partial hydrogenation of tricyclopentadiene (TCPD) was achieved with a high turnover number of 10 000 by catalysis with a N-heterocyclic carbene−palladium complex. Copolymerization of ethylene and the partially hydrogenated product, dihydrotricyclopentadiene (HTCPD), was realized using a catalytic system of [8-(η5-C5Me4)-2-Me(C9H8N)-κN]TiMe2 (C9H10NH = 1,2,3,4-tetrahydroquinoline) activated with (Ph3C)+[B(C6F5)4]−. The copolymer was unambiguously characterized through the analysis of one- and two-dimensional NMR spectra. The monomer reactivity ratios, rethylene and rHTCPD, determined through the Fineman−Ross plot, were 2.8 and 0.025, respectively, indicating negligible successive insertion of two HTCPD. A nearly alternating copolymer with a HTCPD content of 45 mol % was obtained with a satisfactory activity (4.7 × 106 g/(mol Ti h)), of which Tg was 177 °C, significantly higher than that of norbornene/ethylene copolymer at the same cycloolefin content. Tensile stress−strain curves indicated ...

45 citations

Journal ArticleDOI
TL;DR: In this article, the homo and copolymerisation of norbornene and styrene with nickel bis(acetyl acetonate)/methylaluminoxane system were systematically investigated.

45 citations

Journal ArticleDOI
TL;DR: The anomalous reactivity of the bicyclo [2.2.1] double bond is interpreted in terms of hyperconjugative effects, leading to an exceptionally low endo out-of-plane deformation potential as mentioned in this paper.

45 citations

Journal ArticleDOI
Xia Mi1, Zhi Ma1, Nannan Cui1, Leyong Wang1, Yucai Ke1, Youliang Hu1 
TL;DR: In this paper, a dinuclear diimine nickel dichloride complexes were used to obtain polynorbornenes with high packing density and high glass transition temperatures (Tg) above 240°C and decomposed above 400°C.
Abstract: Vinyl-addition polymerization of norbornene was accomplished by two novel dinuclear diimine nickel dichloride complexes in combination with methylaluminoxane (MAO). The activities were moderate. The catalyst structure, Al/Ni molar ratio, solvents, and polymerization temperature all affected the catalytic activities. The obtained polynorbornenes were characterized by 1H-NMR, 13C-NMR, FTIR, DSC, WAXD, and intrinsic viscosity measurements. The vinyl-addition polymers were amorphous but with a short-range order and high packing density. The polynorbornenes showed glass transition temperatures (Tg) above 240°C and decomposed above 400°C. The catalyst structure and polymerization conditions have effects on the molecular weight and the microstructure of the polymers. The nickel complex with bulkier substituents in the ligand produced polynorbornene with a higher packing density and higher regularity and, therefore, with higher Tg. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 3273–3278, 2003

45 citations


Network Information
Related Topics (5)
Alkyl
223.5K papers, 2M citations
91% related
Ruthenium
40.1K papers, 996.5K citations
90% related
Palladium
64.7K papers, 1.3M citations
90% related
Aryl
95.6K papers, 1.3M citations
89% related
Polymerization
147.9K papers, 2.7M citations
88% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202376
2022165
2021113
2020119
2019141
2018136