Reactively formed block and graft copolymers as compatibilizers for polyamide 66/PS blends

Jeon, Hong G.; Feist, Benjamin; Koh, Sok Boon; Chang, Kung Ching; Macosko, Christopher W.; Dion, R. P.

doi:10.1016/j.polymer.2003.10.099

Cited by 53 publications

(30 citation statements)

References 36 publications

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“…PA6 cannot be dissolved by the normal solvents of GPC. In this research, the PA6 was trifluoroacetylated for GPC analysis . PA6 (≈50 mg) was weighed into a 100‐mL flask, along with 2 mL trifluoroacetic anhydride (TFAA) and about 5 mL dichloromethane (DCM).…”

Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of advance PA6‐b‐PDMS multiblock copolymers

Zhang

Fan

2014

J of Applied Polymer Sci

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Advance polyamide-6-b-polydimethylsiloxane (PA6-b-PDMS) multiblock copolymers were first synthesized via the polymerization in bulk. Binary carboxyl terminated PA6 was served as the hard segment and PDMS modified with hexamethylene diisocyanate (PDMS-NCO) was the soft segment. A series of PA6-b-PDMS copolymers based on different content and length of soft segments were obtained. Interestingly, Differential scanning calorimetry (DSC) studies revealed no obvious change in melting temperature after introducing PDMS segments to copolymers. The high melting temperatures indicated these copolymers possess potential applications in automotive industry that require high continuous use temperatures. DSC and transmission electron microscopy studies both demonstrated increasing the length and the content of the soft segment contributed to increasing of the degree of microphase separation. However, the improvement of thermal stability resulting from PDMS segments was also observed by thermo gravimetric analysis.

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Section: Methodsmentioning

confidence: 99%

Synthesis and characterization of advance PA6‐b‐PDMS multiblock copolymers

Zhang

Fan

2014

J of Applied Polymer Sci

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“…The observed shift and decrease in peak area is most likely caused by a decrease in the quantity of sample reaching the detector, and the missing part corresponds to the higher molecular weight portion of the polymer, as implied by the shape of the peaks. Since polymer solution recrystallizes in the solution within 24 hr (Jeon et al, 2004), it is reasonable to assume that the missing higher molecular weight portion of the polymer is forming an insoluble gel that is unable to pass through the SEC column packing. It is interesting to note that the polydispersity of the measured sample seems unaffected by the loss of the high MW fraction.…”

Section: Methodsmentioning

confidence: 99%

Characterization of Polyamide 66 Obturator Materials by Differential Scanning Calorimetry and Size-Exclusion Chromatography

Beyer¹,

Napadensky²,

Ziegler³

2005

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Approved for public release; distribution is unlimited.ii REPORT DOCUMENTATION PAGE Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information Operations and Reports (0704-0188), 1215 Jefferson Davis Highway, Suite 1204, Arlington, VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to any penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number. PLEASE DO NOT RETURN YOUR FORM TO THE ABOVE ADDRESS. REPORT DATE (DD-MM-YYYY)December 2005 ARL-TR-3689 SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES) SPONSOR/MONITOR'S REPORT NUMBER(S) DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES * University of Massachusetts, Amherst ABSTRACTSamples of two polyamide 6/6 materials used to make obturators were characterized by differential scanning calorimetry (DSC) and by size-exclusion chromatography (SEC). The two materials, commercially available DuPont Zytel 42A and Zytel 101, have been used in obturators, but an increase in undesired part failures occurred when Zytel 101 was replaced with the newer Zytel 42A. DSC analysis of these materials revealed very little variation in the nature of the semicrystalline domains, consistent with a previous analysis using x-ray diffraction. Molecular weight characterization by SEC, however, revealed that the Zytel 101 samples as processed have molecular weights ~10% greater than that of the Zytel 42A samples. The change in molecular weight is reproducible, but contradicts previously collected SEC data from similar samples also from obturator specimens. One factor that is thought to be contributing to the change in molecular weight is the change in the annealing medium from mineral oil to dry nitrogen gas. The apparent variability and significant difference in molecular weight is concluded to be the likely cause of the change in mechanical properties leading to the increased failure rate. SUBJECT TERMSnylon 66, polyamide, obturator, DSC, SEC, GPC

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“…[23] The detailed procedure of Ntrifluoroacetylation of the PA(66-co-6T) prepolymer can be found in the literature. [24] The N-trifluoroactylated PA(66-co-6T) was dissolved in THF with a concentration of 3 mg Á ml À1 .…”

Section: Gpc Analysismentioning

confidence: 99%

A Study on a Prepolymerization Process of Aromatic‐Contained Polyamide Copolymers PA(66‐co‐6T) via One‐Step Polycondensation

Zhang

Wan

et al. 2015

Macro Reaction Engineering

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A facile one-step polycondensation approach to prepare a prepolymer of aromatic-contained polyamide using terephthalic acid (PTA), adipic acid (ADA), hexamethylenediamine (HMDA) as raw materials was explored systematically. The prepolymerization process was divided into four stages: formation of nylon salt, temperature rising, polycondensation, and venting. In the first stage, PTA and ADA react completely with HMDA to form salts in 40 min at 50 8C. The system is then heated up. The salts do not react until the temperature reaches 200 8C, irrespective of the heating rate. After the temperature is above 200 8C, the polymerization degree of the prepolymer increases with increasing temperature and/or increasing time. In the venting stage, the polycondensation reaction continues to proceed. After 40% of the total amount of water is removed, the molecular weight of the prepolyamide increases dramatically and even far exceeds that of the polycondensation stage. Moreover, a longer venting time or a lower pressure drop rate is beneficial for the polycondensation of nylon salts. GPC, FTIR, and NMR analyses show that the molecular weight of the as-synthesized prepolyamide decreases with increasing feed ratio between PTA and ADA. However, this feed ratio does not affect much its composition.

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Reactively formed block and graft copolymers as compatibilizers for polyamide 66/PS blends

Cited by 53 publications

References 36 publications

Synthesis and characterization of advance PA6‐b‐PDMS multiblock copolymers

Synthesis and characterization of advance PA6‐b‐PDMS multiblock copolymers

Characterization of Polyamide 66 Obturator Materials by Differential Scanning Calorimetry and Size-Exclusion Chromatography

A Study on a Prepolymerization Process of Aromatic‐Contained Polyamide Copolymers PA(66‐co‐6T) via One‐Step Polycondensation

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