Whisker of poly(p-oxybenzoyl-co-p-mercaptobenzoyl)?influence of sequence on polymer morphology

Kimura, Kunio; Nakajima, D.; Kobashi, Kazufumi; Yamashita, Yuhiko; Yokoyama, Fumiyoshi; Uchida, Tetsuya; Sakaguchi, Yoshimitsu

doi:10.1002/1099-1581(200008/12)11:8/12<747::aid-pat53>3.0.co;2-4

Cited by 17 publications

(18 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[68][69][70][71][72] Preparation of the poly(p-oxybenzoyl-cop-mercaptobenzoyl) whiskers was examined by solution polymerization in liquid paraffin at the concentration of 1.0% and 300 C. Copolymerization of ABA and AMBA did not yield the whiskers. This was attributed to tendency that the copolymerization reduced the crystallizability of oligomers and induced the liquid-liquid phase separation of oligomers due to the lower freezing point.…”

Section: Reaction-induced Crystallizationmentioning

confidence: 99%

Morphology Control of Aromatic Polymers in Concert with Polymerization

Kimura

Kohama

Yamazaki

2006

Polym J

Self Cite

View full text Add to dashboard Cite

ABSTRACT:Morphology control methods of aromatic polymers in concert with polymerization reaction are described in this review. Many attractive methods have been developed including reaction-induced phase separation of oligomers, epitaxial polymerization, shear-induced chain orientation during gelation, template-based polymerization, suspension polycondensation, solid-state polycondensation and liquid-liquid interfacial precipitation and so on. Among them, the reaction-induced phase separation of oligomers, in which there are two modes of crystallization and liquidliquid phase separation, possess practically high potentiality to create novel polymer materials since it can control not only the morphology but also the molecular chain orientation. Ultimate goal is the embodiment of the nature system in a flask, that is, the control of the materials from primary structures to super structures. The morphology control methods by using polymerization reaction afford the valuable methodology for the three-dimensional structure architecture.[doi:10.1295/polymj.PJ2006083] KEY WORDS Morphology / Phase Separation / Oligomer / Whisker / Microsphere / Epitaxy / Aromatic Polymer / Morphology of polymer materials is of great importance as well as the molecular chain orientation for the creation of new functional and high-performance materials possessing essential properties predicted from their molecular structures. From the both aspects of molecular chain orientation and morphology, one of the ideal materials is a needle-like single crystal of extended molecular chains called polymer whisker. Especially, wide variety of polymeric nanomaterials is required for supporting nanotechnology and the more precise controls are rapidly necessitated in these days. Hence, the demand for the morphology control method increases significantly. Usually, extended molecular chain crystals are difficult to obtain by conventional processing methods and the special processing techniques have been developed thus far.1 There exists another stream for the development of extended molecular chain crystals by means of crystallization during polymerization. The needle-like crystals of both flexible and rigid polymers have been obtained by the solid-state polymerization of the monomers and the polymerization in the solution. Examples of the former polymerization have included oxacyclobutanes such as 1,3,5-trioxane, 2,3 diolefins undergoing four-center type photopolymerization 4,5 and monomers with conjugated triple bonds such as substituted diacetylenes.6,7 On the other hand, the first polymer whisker was obtained by the cationic ring-opening polymerization of 1,3,5-trioxane. [8][9][10] The obtained polyoxymethylene whiskers were 1-2 mm in width and 10-50 mm in length. The molecular chains aligned along the long axis of the whisker. They were brought into practical uses with its unique morphology and good mechanical properties.11,12 However, the polyoxymethylene whisker has a melting temperature at 180 C and the low melting temperature limits the broader c...

show abstract

Section: Reaction-induced Crystallizationmentioning

confidence: 99%

Morphology Control of Aromatic Polymers in Concert with Polymerization

Kimura

Kohama

Yamazaki

2006

Polym J

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recently, we have been studying the morphology of copolymers prepared by the polymerization of p-acetoxybenzoic acid (ABA) and S-acetyl-4-mercaptobenzoic acid (AMBA). 14 The crystal habit disappeared with copolymerization due to the lack of the crystallizability of oligomers. This article describes our new finding on the self-assembling polymerization to prepare poly(p-oxybenzoyl-alt-p-mercaptobenzoyl) (POB-alt-PMB) whiskers and the influence of the sequence regularity on the morphology as shown in Scheme 1.…”

Section: Introductionmentioning

confidence: 99%

Self-Assembling Polycondensation for Preparation of Poly(p-oxybenzoyl-alt-p-mercaptobenzoyl) Whisker

Kobashi¹,

Kimura²,

Yamashita³

et al. 2003

Macromolecules

Self Cite

View full text Add to dashboard Cite

Self-assembling polycondensation was examined to prepare the whisker of poly(p-oxybenzoyl-alt-p-mercaptobenzoyl). Polymerizations were carried out in liquid paraffin (LPF) and aromatic solvents such as Therm S 800 and 1000 at 300 °C for 6 h. Polymerization concentration was 1.0 wt/vol %. The whisker was not obtained by the random copolymerization of p-acetoxybenzoic acid and S-acetyl-4-mercaptobenzoic acid at the molar ratio of 0.5 in feed. However, the whiskers were successfully prepared by the polymerization of S-(4-acetoxybenzoyl)-4-mercaptobenzoic acid (OS) and 4-(S-acetyl-4-mercaptobenzoyl)oxybenzoic acid (SO). The whisker prepared from OS (POS) in LPF was 18 μm in average length and 0.4 μm in average width, and that from SO (PSO) was slightly longer than POS. The whiskers prepared in aromatic solvents were much longer than those in LPF, for which the length was 36−49 μm. These whiskers consist of the alternating polymer chains, and the polymer chains align along the long axis of the whisker. The sequence regularity enhanced the crystallizability of the oligomers, and this led to the formation of whiskers. The oligomer formation rate was much higher than that of transesterfication reaction rate, and this large difference in these two rates made the oligomer precipitate with maintaining the alternating sequence. Further polymerization occurred in the crystals, and the whiskers having the alternating sequence were finally completed. The difference in the two rates increased with the decrease of the miscibility between the oligomer and the solvent, and therefore, OS and LPF were more advantageous to maintain the alternating sequence.

show abstract

“…We have been studying self-assembling polycondensation by means of reaction-induced crystallization of oligomers during solution polycondensation [4] and reported the possibility of sequence control for aromatic polyesters. [5] These results represent one possible way to answer the question raised above. Another could be the creation of a multiplex self-assembling system that allows the simultaneous formation of different polymers with different morphologies in a one-pot polymerization.…”

Section: Introductionmentioning

confidence: 76%

“…The copolymers' composition was determined by means of HPLC (Waters 600E) after hydrolysis of the products as reported previously. [5] WAXS was performed on an X-ray diffractometer (CuK a , Gaiger flex, Rigaku Co. Ltd.).…”

Section: Measurementsmentioning

confidence: 99%

Dual Self‐Assembling Polycondensation of p‐Acetoxybenzoic Acid and p‐Acetamidobenzoic Acid

Kimura¹,

Kobashi²,

Maeda³

et al. 2003

Macromol. Rapid Commun.

Self Cite

View full text Add to dashboard Cite

The dual self‐assembling polycondensation of p‐acetoxybenzoic acid (ABA) and p‐acetamidobenzoic acid in Therm S 800 was examined at 300 °C. Needle‐like crystals and lath‐like crystals were formed simultaneously through reaction‐induced crystallization of oligomers at a molar ratio of 30–50 mol‐% ABA in the feed. The needle‐like crystals comprised more p‐oxybenzoyl units, whereas the lath‐like ones contained higher amounts of p‐benzamide moieties. magnified image

show abstract

Whisker of poly(p-oxybenzoyl-co-p-mercaptobenzoyl)?influence of sequence on polymer morphology

Cited by 17 publications

References 29 publications

Morphology Control of Aromatic Polymers in Concert with Polymerization

Morphology Control of Aromatic Polymers in Concert with Polymerization

Self-Assembling Polycondensation for Preparation of Poly(p-oxybenzoyl-alt-p-mercaptobenzoyl) Whisker

Dual Self‐Assembling Polycondensation of p‐Acetoxybenzoic Acid and p‐Acetamidobenzoic Acid

Contact Info

Product

Resources

About