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HIGH PERFORMANCE AND TEMPERATURE RESISTANT ENGINEERING THERMOPLASTICS——STUDY ON THE NAPHTHALENE-BASED POLY(ARYL ETHER)S

Posted on:2001-09-11Degree:DoctorType:Dissertation
Country:ChinaCandidate:Y GaoFull Text:PDF
GTID:1101360002452018Subject:Polymer materials
Abstract/Summary:PDF Full Text Request
Poly ( aryl ether)s are well known high performance thermoplastics which generally exhibit high thermal and excellent impact resistance. They can be used in composite and adhesive applications. However, Poly ( aryl ether)s suffer the problem of very high price which limits their application in some areas. One of the reason is that the fluoro-monomer was used in the reaction. The work presented here involves the preparation of novel poly (aryl ether)s containing the 1 ,4-naphthylene moiety by the conventional aromatic nucleophilic substitution route. These polymers were prepared from chloro-monomers and their chemistry, thermal, mechanical and physical properties were researched.In this dissertation, four chloro-monomers containing the I ,4-naphthylene moiety were readily synthesized, two unsymmetric monomers, I -chloro-4-(4-chlorobenzoyl) naphthalene (CCBN), I -chloro-4-(4-chlorobenzenesulfonyl) naphthalene (CCB SN), and two symxneUic monomers, 1 ,4-bis(4?chloro- 1 ?naphthoyl) benzene (DCNB), I -chloro-4-(4-chloronaphthol sulfonyl) naphthalene (CCNSN). The monomers were characterized by FTIR, NMR, DSC,MS and UV. The experiment showed that the monomers had certain reactivities. All the polymers were soluble. For the same biphenol-based polymers, with the increase of the ratioof CCBNIDFK, the Tgs increased, ri ~ decreased, the tensile strength were the result of the compromise of the toughen of the chain and the decrease of the iiPoly (ether ketone)s containing the 1 ,4-naphthylene moiety were prepared by the nucleophilic substitution of CCBN (and 4,4?difluorobenzophenone (DFK)) with four bisphenols respectively ??4-(4-hydroxyphenyl) (2H) phthalazin- 1-one (DHPZ), 4,4抜sopropylidenediphenol (BPA), phenolphthalein (PPn) and 1 ,4-hydroquinone (HQ). The (co) polymers were characterized by FTIR, NMR, WAXD. The effect of the ratio of CCBN and DFK on the thermal, mechanical properties and solubility were studied.Poly (ether sulfone (ketone))s containing the I ,4-naphthylene moiety were prepared by the nucleophilic substitution of CCBSN (and DFK) with DHPZ, BPA, PPn, HQ respectively. The (co) polymers were characterized by FTIR, NMR, WAXD. The thermal properties and solubility were also studied.Poly (ether ketone ketone)s containing the I ,4-naphthylene moiety were prepared by the nucleophilic substitution of DCNB (and DFK) with DHPZ, DCNB with BPA, PPn, DCNB (and CCBN) with HQ respectively. The (co) polymers were characterized by FTTR, NMR, WAXD. The thermal properties and solubility were also studied. The Tgs were ranged from 191.3 C to 286.7 C. For DCNB/DFK/DHPZ, with the increase of the ratio of DCNB/DFK, the Tg increased. For DCNB/CCBN/HQ, with the decrease of the ratio of DCNB/CCBN, both Tg and crystallinity reduced, solubility increased.Poly (ether sulfone (ketone))s containing the 1 ,4-naphthylene moiety were prepared by the nucleophilic substitution of CCNSN (and DFK) with DHPZ, CCNSN with BPA, PPn, CCNSN (and CCBN or CCB SN) with HQ respectively. The (co) polymers were characterized by FTIR~ NMR, WAXD. The thermal properties and solubility were also studied. The Tgs were ranged from 223.5C to 317.8XD. For CCNSN /DFKIDHPZ, with the increase of the ratio of CCNSN /DFK, the Tg increased. For CCNSN /CCBN or CCBSN /HQ, with the decrease of the ratio of CCNSN /CCBN or CCBSN, both Tg (for CCNSN I CCBSN /HQ the Tgs changed little) and crystallinity reduced, solubility increased.Poly (aryl sulflde)s containing the 1 ,4-naphthylene moiety were prepared by the nucleophilic substitution of CCBN,CCBSN,DCNB and CCNSN with sodium sulfide and sodium acetate in NIvIP respectively. They were all oligomer. They were studied by FTIR, NMR, WAXD, DSC and TGA. The results indicated the Tgs ranged from 113.5 慍 to 208.8 C.The onset temperatures for 5% weight loss ranged from 401 慍 to 446 C in nitrogen, as assessed by thermogravimetry. The CCBN/S and CCBSN/S were amorphous and solubie. The DCNB/S and CCNSN/S were semicrystalline and insoluble at room temperature.
Keywords/Search Tags:Engineering plastics, poly (aryl ether ketone), poly (aryl ether sulfone), poly (aryl ether ketone ketone), poly (aryl ether sulfone ketone), heterocyclic polymer, synthesis, property
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