ライフサイエンスコーパス: isotactic

1 ening polymerization (ROP) to enantiopure di-isotactic alpha-alkylated PHAs.

2 Previously, we established the synthesis of isotactic, alternating PLGA from enantiopure starting ma

3 lecular architectures, such as atactic block-isotactic and isotactic-block-atactic polymers in a one-

4 y beams introduces unique characteristics to isotactic and syndiotactic metabeams, allowing for the m

5 om tacticity, we extend our investigation to isotactic and syndiotactic metabeams, altering physical

6 , enabling the baseline separation of highly isotactic and syndiotactic PMMAs of different molar mass

7 approach enabled the synthesis of perfectly isotactic and syndiotactic polymers (100% m or r dyads),

8 Polar functionalized isotactic and syndiotactic polypropylenes (PPs) are synt

9 enced crystalline polyhydroxyalkanoates with isotactic and syndiotactic stereodiblock or stereotapere

10 muir-Blodgett monolayers of various isomers (isotactic and syndiotactic) of poly(methyl methacrylate)

11 The syndiotactic, isotactic, and even atactic PHMBs all share high melting

12 merization produces the highly stereoregular isotactic-b-syndiotactic stereoblock poly(methyl methacr

13 , narrow molecular weight distributions, and isotactic backbones can be readily synthesized.

14 ectures, such as atactic block-isotactic and isotactic-block-atactic polymers in a one-pot polymeriza

15 These highly isotactic chiral polymers exhibit an enhancement of the

16 ctional norbornenes providing functional cis-isotactic (cis-it), cis-syndiotactic (cis-st) and trans-

17 tion temperature) of 44 degrees C, while its isotactic counterpart synthesized from enantiopure epoxi

18 Isotactic EPPE sequences are indicative of occasional mu

19 ctive sites (R =Me, i-Pr) yield alternating, isotactic ethylene/propylene copolymers with percentages

20 Highly isotactic (>99% mmmm) poly-1-hexene is produced with no

21 l carboxylic acid feet, and "steps" along an isotactic hydroxyl-group-derivatized polyether track by

22 rk, alkene-terminated syndiotactic (st-) and isotactic (it-) PMMA polymers were prepared and subseque

23 ynthesis and characterization of atactic and isotactic linear poly(benzyl 1,2-glycerol carbonate)s ar

24 (S)-2 indicates that the polymers are highly isotactic materials.

25 comprising enriched syndiotactic [rr] and no isotactic [mm] triads but abundant stereo-defects random

26 nificantly enhances stereoselection for both isotactic (mmmm: 59.5 %->91.0 %) and syndiotactic (rrrr:

27 Poly(lactic acid) featuring the new gradient isotactic multiblock microstructure was synthesized by i

28 commercial adhesives, whereas syndiotactic, isotactic, or iso-rich P3HB shows no measurable adhesion

29 e, we introduce a new approach to synthesize isotactic PAN (iPAN) using a two-step chemical process t

30 trolled, producing essentially stereoperfect isotactic PDAA with [mmmm] > 99%, M(n) matching the theo

31 Isotactic PEPEP sequences and atactic EPPE sequence erro

32 Isotactic PEPEP sequences were observed for all metalloc

33 e yielded high-molecular-weight, crystalline isotactic PHA copolymers that are hard, ductile, and tou

34 However, the synthesis of alternating isotactic PHAs has not been achieved by the existing met

35 organic superbase produces erythro-(R,S)-di-isotactic PHAs with chiral inversion, achieving precisio

36 tion-insertion ROP results in threo-(R,R)-di-isotactic PHAs with chiral retention, whereas anionic RO

37 ith chiral inversion, achieving precision di-isotactic PHAs with exclusive regio- and stereoregularit

38 lysts, enabling the synthesis of alternating isotactic PHAs, poly(3-hydroxybutyrate-alt-3-hydroxyvale

39 ucture-property relationship study of the di-isotactic PHAs, providing insights into the effects of m

40 operties depend upon its stereochemistry and isotactic PLA shows superior thermal-mechanical performa

41 )ZnO(i)()Pr](2) polymerized (S,S)-lactide to isotactic PLA without epimerization of the monomer, rac-

42 clusters yields very different patterns for isotactic PMMA LB layers than for the syndiotactic and a

43 eating ion patterns from the TOF-SIMS of the isotactic PMMA monolayers are analyzed by considering bo

44 The double-helical structure of isotactic PMMA monolayers is verified using reflection a

45 s that the reduced beta (beta)-relaxation of isotactic PMMA most efficiently suppresses vibrational t

46 sulting double-helical tertiary structure of isotactic PMMA, a structure that does not form for the s

47 polymers have been studied using atactic and isotactic PMMA; atactic and brominated PS; and the semif

48 thetic strategy to access all enantiopure di-isotactic poly(3-hydroxyalkanoate) (PHA) diastereomers f

49 ation of rac-beta-butyrolactone (beta-BL) to isotactic poly(3-hydroxybutyrate) (i-PHB), a high perfor

50 The catalyst system produces isotactic poly(3-hydroxybutyrate) (PHB) with record prod

51 A polymerization but still leading to highly isotactic poly(allyl methacrylate) (PAMA) with 95-97% [m

52 Specifically, atactic and isotactic poly(benzyl glycidate carbonate)s are obtained

53 Enantiopure isotactic poly(cyclohexene carbonate) (PCHC) has been sy

54 The stereocomplexation of isotactic poly(L-lactide) and poly(D-lactide) has led to

55 diotactic vinyl-functionalized polymers with isotactic poly(methyl methacrylate) and fullerene C60 ge

56 ll-defined stereoblock copolymers, atactic-b-isotactic poly(N,N-dimethylacrylamides), were obtained b

57 opening polymerizations (ROPs), resulting in isotactic poly(phenyl glycidyl ether).

58 Highly isotactic poly(propylene oxide) (iPPO) was investigated

59 addition, the racemic catalyst forms highly isotactic poly(propylene oxide) in quantitative yield.

60 merization to make low dispersity (D < 1.25) isotactic poly(tert-butylacrylamide) (iPTBAM; M(w) ~ 150

61 d vinyl ethers enabled the preparation of an isotactic poly(vinyl ether) with the highest stereoselec

62 Isotactic poly(vinyl ether)s (PVEs) have recently been i

63 catalytic systems and for the translation of isotactic poly(vinyl ether)s to applied areas.

64 r substrates, providing access to a range of isotactic poly(vinyl ether)s with high degrees of isotac

65 selectively resolves a single enantiomeric, isotactic polyether stereoisomer ([mm](P)>=78 %), the is

66 ly showed the ability to synthesize enriched isotactic polylactide with a Pm higher than 0.90 at room

67 se alcohol-bonded thioimidates yields highly isotactic polylactide with fast kinetics and living poly

68 ry and regulated charge transport pathway of isotactic polymer chains in contrast to the irregular st

69 es iso-rich material in contrast to the pure isotactic polymer microstructure obtained when degenerat

70 At room temperature the isotactic polymer shows much greater conductivity (ca. 1

71 With the exception of site-controlled isotactic polymerization of alpha-olefins, none of these

72 Post-functionalization of isotactic polymers bearing the pendant vinyl group on ev

73 Photocuring of such isotactic polymers is also successful, producing an elas

74 synthesis of a series of naturally occurring isotactic polymethoxy compounds.

75 dissolution of linear polyethylene (PE) and isotactic polypropylene (iPP) are greatly influenced by

76 Polyethylene (PE) and isotactic polypropylene (iPP) constitute nearly two-thir

77 rs from high-density polyethylene (HDPE) and isotactic polypropylene (iPP) has gained increasing atte

78 ydrogenolytic separation of polyethylene and isotactic polypropylene (iPP) mixtures.

79 , stereospecificites, regiospecificites, and isotactic polypropylene (IPP) Mw.

80 ve of matched high-performance properties to isotactic polypropylene (iPP) that accounts for 40% of p

81 the thermally initiated C-H xanthylation of isotactic polypropylene (iPP) within a twin-screw extrud

82 strategy for recycling polyethylene (PE) and isotactic polypropylene (iPP), constituting roughly half

83 ollution, dominated by polyethylene (PE) and isotactic polypropylene (iPP).

84 seen in other semicrystalline polymers like isotactic polypropylene (iPP).

85 ionizing production of polyethylene (PE) and isotactic polypropylene (iPP).

86 cessfully compatibilized unmodified HDPE and isotactic polypropylene (iPP).

87 oxide (SZO) catalyzes the hydrogenolysis of isotactic polypropylene (iPP, M(w)=13.3 kDa, D=2.4, <mmm

88 biodegradable alternative to semicrystalline isotactic polypropylene but is brittle and opaque.

89 ene-block-regioirregular polypropylene-block-isotactic polypropylene pentablock copolymer was synthes

90 is of a number of block copolymers featuring isotactic polypropylene semicrystalline blocks and poly(

91 ene-block-regioirregular polypropylene-block-isotactic polypropylene triblock copolymers were synthes

92 he hydroxylated derivative of the commercial isotactic polypropylene was used as macroinitiator for t

93 ntless conditions, polyethylene-co-1-octene, isotactic polypropylene, and a post-consumer food contai

94 0.017 mol % aluminum) efficiently break down isotactic polypropylene, high-density polyethylene, ethy

95 perties, including low-density polyethylene, isotactic polypropylene, ultrahigh-molecular-weight poly

96 iegler-Natta catalyst particle fragments and isotactic polypropylene, while 3-D XRF visualizes multip

97 An isotactic polypropylene-block-regioirregular polypropyle

98 ene-block-regioirregular polypropylene-block-isotactic polypropylene-block-regioirregular polypropyle

99 pylene)-block-syndiotactic polypropylene and isotactic polypropylene-block-regioirregular polypropyle

100 with a surface structure that produces only isotactic polypropylene.

101 tion is not necessary in the semicrystalline isotactic polypropylenes to achieve good mechanical perf

102 Unlike atactic PPO, isotactic PPO is semicrystalline with a melting temperat

103 In this paper, hydroxy-telechelic isotactic PPO is synthesized from racemic propylene oxid

104 g agents are used to give hydroxy-telechelic isotactic PPO of varying functionality and structure.

105 is no practical route to hydroxy-telechelic isotactic PPO using racemic propylene oxide as the monom

106 This isotactic propylene copolymer with main-chain unsaturati

107 Currently, methods to synthesize isotactic PVEs are limited to strong Lewis acids that re

108 OP leads to the concurrent formation of both isotactic (R)- and (S)-poly(phenyl glycidyl ether) stere

109 ereomicrostructures are strictly confined to isotactic (R)-polymers or copolymers of random sequences

110 rmation of a polymer stereocomplex by mixing isotactic, regioregular chains of poly(propylene succina

111 a[a]triptycyl ansa-zirconocene catalysts for isotactic-selective propene polymerization, designed by

112 es meso- and rac-lactide to heterotactic and isotactic stereoblock PLA, respectively.

113 The latter catalyst produces an isotactic stereoblock polymer (P(m) up to 0.95) that for

114 ransfer polymerization of propene to provide isotactic stereoblock polypropene.

115 iral or racemic monomers outside of "simple" isotactic stereoblocks remains limited.

116 roperties of copolymers, a family of complex isotactic, syndiotactic, and atactic repeating sequence

117 s in three different isomeric forms, namely, isotactic, syndiotactic, and atactic.

118 three types of well-defined stereosequences: isotactic, syndiotactic, and heterotactic.

119 w, rac-LA yields polymers highly enriched in isotactic tetrads (iii).

120 s to polymerize N-vinylcarbazole into highly isotactic (up to 94% meso triads) polymers.

121 We have prepared the atactic and isotactic versions of this polymer, using enantiopure R

122 ornadiene) the structure was shown to be cis,isotactic, while for poly(7-oxa-2,3-dicarbomenthoxynorbo