Living carbocationic polymerization. 56. Polyisobutylene-containing block polymers by sequential monomer addition. 8. Synthesis, characterization, and physical properties of poly(indene-b-isobutylene-b-indene) thermoplastic elastomers

Kennedy, Joseph P.; Midha, Sanjeev; Tsunogae, Yasuo

doi:10.1021/ma00055a004

Cited by 39 publications

(19 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 8 shows the DSC endothermic curve profiles of PInd and the Ind-copolymers (Ind:St MR = 0.9; Ind: Lim MR = 1.4; Ind:ENB MR = 1.0). A baseline deviation in the endothermic curves is used to determine the glass transition temperature of the samples and the absence of a melting point corroborates the amorphous nature of the Ind-copolymers produced by cationic polymerization [11,21]. Since they are amorphous, the Ind-copolymers are transparent and rigid and have high T g values.…”

Section: Resultsmentioning

confidence: 69%

“…Sigwalt et al [8,9] and Kennedy et al [10,11] investigated several living polymerizations of Ind with Cumyl-OCH 3 , TMP-Cl/TiCl 4 , or TiCl 3 (BuO) in the presence of electron donors such as DMSO, DMA, Et 3 N, DTBP, or Cumyl-Cl/BCl 3 to produce controlled polymer structures. Polyindene (PInd) with low M n (13 Â 10 3 g/mol) and polydispersity (1.2) was obtained with Cumyl-Cl/ BCl 3 in chloroform at À80°C.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis of hydrocarbon polymers by cationic polymerization and their thermal properties

Brum

Laux

Forte

2012

Designed Monomers and Polymers

View full text Add to dashboard Cite

Cationic homo-and co-polymerization of indene (Ind), styrene (St), limonene (Lim), and 5-ethylidene-2-norbornene (ENB) was performed with AlCl 3 in dichloroethane at À20°C under inert N 2 . The aim of this work is to investigate the effect of the reaction conditions on the molecular weight of polyindene (PInd) obtained by cationic polymerization with AlCl 3 without an electron donor, and also to determine the effect of the use of cyclic diolefin comonomers on the polymer properties. The polymers were synthesized at a monomer/catalyst molar ratio (MR) of 100; St and Lim showed the highest and lowest reactivity, respectively. The polymers were characterized by 13 C and 1 H NMR spectroscopy, Fourier transform infrared spectroscopy, ultraviolet-visible spectroscopy, size exclusion chromatography, differential scanning calorimetry, and thermogravimetric analysis. PInd with a number average molecular weight (M n ) of 45 Â 10 3 g/mol and a glass transition temperature (T g ) of 207°C was obtained, whereas only oligomeric polylimonenes were obtained. Cyclic diolefins depressed both the M n and T g values of the Ind-copolymers. There was a dramatic decrease in the M n of the polymers: those obtained at a MR of 1:1 in the feed presented M n values lower than 10 4 g/mol, with the exception of poly(Ind-co-ENB), which is cross-linked. Poly(Ind-co-Lim) with lateral double bonds, a comonomer content of 1 to 20 mol%, and T g values in the range of 140-200°C were obtained.

show abstract

Section: Resultsmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Synthesis of hydrocarbon polymers by cationic polymerization and their thermal properties

Brum

Laux

Forte

2012

Designed Monomers and Polymers

View full text Add to dashboard Cite

show abstract

“…Another feature that distinguishes cationic polymerization from anionic polymerization is the ability to control the polymerization of high T g monomers such as p-chlorostyrene (pCS) [43], indene (ID) [44], and acenaphthylene (ACP) [44,45]. Triblock copolymers using PpCS (T g ~129°C), PID (T g ~225°C), or PACP (T g ~250°C) as the hard segment and PIB as the soft segment were successfully prepared by cationic polymerization and showed stressstrain behavior similar to typical TPEs.…”

Section: Block Copolymers Synthesized By Cationic Polymerizationmentioning

confidence: 99%

Thermoplastic Elastomers Based on Block, Graft, and Star Copolymers

Wang¹,

Lu²,

Kang³

et al. 2017

Elastomers

View full text Add to dashboard Cite

In this book chapter, we focus on recent advances in thermoplastic elastomers based on synthetic polymers from the aspects of polymer architectures such as linear block, graft, and star copolymers. The irst section is an introduction that covers a brief history and classiication of thermoplastic elastomers (TPEs). The second section summarizes ABA triblock copolymers synthesized by various methods for TPE applications. The third section reviews TPEs based on graft copolymers, and the fourth section reviews TPEs based on star copolymers. The diferences between TPE research in academia and industry are addressed in the last section as a perspective, with a view toward the generation of new, advanced, commercially viable TPEs.

show abstract

“…As part of our ongoing research on the synthesis of novel polyisobutylene-based thermoplastic elastomers, [1][2][3][4][5][6][7] we have recently become interested in the synthesis of star-block copolymers containing glassy-rubbery arms because they offer significant processing advantages over those of similar linear TPEs. The synthesis of homo-PIB stars and star-blocks with three and multi polystyrene-b-polyisobutylene (PSt-b-PIB) arms by living cationic polymerization was reported recently by our group and by others.…”

Section: Introductionmentioning

confidence: 99%

“…The synthesis of homo-PIB stars and star-blocks with three and multi polystyrene-b-polyisobutylene (PSt-b-PIB) arms by living cationic polymerization was reported recently by our group and by others. 1,[7][8][9][10][11][12][13][14][15][16][17][18][19][20] The present work concerns the synthesis of thermoplastic elastomeric star-blocks of multiple PSt-b-PIB arms radiating from cyclosiloxane cores, specifically the synthesis of primary and higher-order such star-blocks. Primary starblocks consist of multiple diblock arms radiating from a single cyclosiloxane core, while the higherorder star-blocks contain complex cores formed by core-core coupling of primary stars (i.e., they consist of multiple arms radiating from condensed cyclosiloxane cores).…”

Section: Introductionmentioning

confidence: 99%

Novel thermoplastic elastomers. I. Synthesis and characterization of star-block copolymers of PSt-b-PIB arms emanating from cyclosiloxane cores

Shim

Asthana

Omura

et al. 1998

J. Polym. Sci. A Polym. Chem.

Self Cite

View full text Add to dashboard Cite

The synthesis and characterization of novel thermoplastic elastomers consisting of multiple polystyrene‐b‐polyisobutylene (PSt‐b‐PIB) arms emanating from cyclosiloxane cores is described. The synthesis involved the sequential living cationic block copolymerization of styrene (St) and isobutylene (IB), followed by quantitative allylic end‐functionalization of the living PSt‐b‐PIB+ to produce PSt‐b‐PIBCH2 CHCH2 prearms, and finally linking by hydrosilation of these prearms with SiH‐containing cyclosiloxanes (e.g., 2,4,6,8,10,12‐hexamethylcyclohexasiloxane, D H6). Two types of star‐blocks, namely primary and higher‐order star‐blocks, were prepared: Primary star‐blocks containing 3–9 PSt‐b‐PIB arms were obtained by using various cyclosiloxanes (D H6 to D H12) and a close to exact stoichiometry between the SiH and allyl groups, [SiH]/[CC] ∼ 1, in the essential absence of moisture ([H2O] ∼ 100 ppm). Higher‐order star‐blocks consisting of 13–24 PSt‐b‐PIB arms radiating from complex coupled cyclosiloxanes were prepared by the use of SiH/allyl ratios significantly larger than unity ([SiH]/[CC] = 2–3) in the presence of controlled amounts of moisture ([H2O] ∼ 600 ppm). Reaction conditions (temperature, concentration, stoichiometry, solvent nature, catalyst concentration, etc.) for efficient syntheses have been developed. The products were characterized by 200 and 600 MHz 1H‐NMR spectroscopy and triple‐detector (RI, UV, LLS) GPC. The microstructure of the condensed cores in the higher‐order star‐blocks was studied by 2D‐NMR (HMQC) spectroscopy, and the number of cyclosiloxane rings in the cores (i.e., the content (wt %) of cores in the star‐blocks) was determined. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 2997–3012, 1998

show abstract

Living carbocationic polymerization. 56. Polyisobutylene-containing block polymers by sequential monomer addition. 8. Synthesis, characterization, and physical properties of poly(indene-b-isobutylene-b-indene) thermoplastic elastomers

Cited by 39 publications

References 2 publications

Synthesis of hydrocarbon polymers by cationic polymerization and their thermal properties

Synthesis of hydrocarbon polymers by cationic polymerization and their thermal properties

Thermoplastic Elastomers Based on Block, Graft, and Star Copolymers

Novel thermoplastic elastomers. I. Synthesis and characterization of star-block copolymers of PSt-b-PIB arms emanating from cyclosiloxane cores

Contact Info

Product

Resources

About