Multifunctional coupling agents. II. Chain extension and terminal group modification of polyamides

Wiley - Tập 94 Số 5 - Trang 2170-2177 - 2004
Lothar Jakisch1, Hartmut Komber1, R. Wursche2, Frank Böhme1
1Institute of Polymer Research Dresden, e.V. Hohe Straβe 6, D-10069 Dresden, Germany
2Degussa AG, Paul‐Baumann‐Strasse 1, D‐45764 Marl, Germany

Tóm tắt

AbstractNew bifunctional coupling agents possessing one 2‐oxazoline group and one 2‐oxazinone group were converted in a Haake melt mixer or extruder with PA6 and PA12. It was shown by means of NMR spectroscopic investigations that the 2‐oxazoline group reacted mainly with carboxylic groups whereas the oxazinone group reacted preferably with the amino groups. Both reactions proceeded with high selectivity and independent from each other. In the case of carboxy/amino group terminated polyamides, the conversions resulted in increased molecular weights since both reactive terminal groups of the polyamides were addressed simultaneously by the coupling agent. In the case of amino group terminated polyamides, the conversion with the bifunctional coupling agent resulted in oxazoline terminated polymer chains. Unlike PA6, it was possible to convert PA12 in two steps. At lower temperatures (210°C) and short reaction times (2 min), the reaction of the oxazinone group with the amino groups was predominant, whereas the reaction of the oxazoline group with the carboxylic groups proceeded to a sufficient extent only after longer reaction times or at higher temperatures. In the case of PA6, processing temperatures of about 250°C were necessary. Here, a side reaction was observed that resulted in the formation of cyclic quinoxaline structures under evolution of water. This side reaction did not disturb the chain extension significantly. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 2170–2177, 2004

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Tài liệu tham khảo

10.1002/app.1986.070320423

10.1007/BF00296228

10.1016/S0032-3861(00)00751-5

10.1002/macp.200300054

10.1002/(SICI)1097-4628(19971024)66:4<633::AID-APP3>3.0.CO;2-T

10.1002/(SICI)1099-0518(199712)35:17<3697::AID-POLA9>3.0.CO;2-P

Acevedo M.;Fradet A.;Judas D.EP 581641 (1994)

Acevedo M.;Fradet A.;Judas D.CA1994 120 165299.

10.1002/app.1987.070340724

10.1007/BF00315063

10.1002/pola.1995.080330410

10.1002/apmc.1993.052060113

10.1002/1097-4628(20010307)79:10<1816::AID-APP100>3.0.CO;2-R

10.1002/(SICI)1097-4628(19970829)65:9<1813::AID-APP18>3.0.CO;2-N

Jakisch L.;Böhme F.DE 19812409 (1998)

Jakisch L.;Böhme F.CA1999 130 312216.

Jakisch L.;Böhme F.DE 100 34 154 (2000)

Jakisch L.;Böhme F.WO 02/04441 (2001)

Jakisch L.;Böhme F.CA2002 136 102787.

10.1002/1521-3900(200001)149:1<237::AID-MASY237>3.0.CO;2-X

10.1002/pola.10612

Errede A.US 3 408 326

Errede A.CA19691968 70 58558.

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Wiley

Tập 94 Số 5

2170-2177

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