کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7825357 | 1502925 | 2018 | 24 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
'Schizophrenic' behavior of poly (N-isopropylacrylamide)-b-poly (2-vinylpyridine) in aqueous solutions
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A series of well-defined double hydrophilic block copolymers Poly (N-isopropylacrylamide)-b-poly (2-vinylpyridine) (PNIPAM38-b-P2VP43) were synthesized. The 'schizophrenic' behavior and the aggregation process of PNIPAM-b-P2VP in response to temperature and pH in dilute aqueous solution were tested via transmittance measurements, dynamic light scattering (DLS), and small-angle neutron scattering (SANS). The results revealed that: i) both PNIPAM-core and P2VP-core micelles can be induced from an intermediate unimers state via the adjustment of temperature and pH; ii) The lower critical solution temperature (LCST) of PNIPAM homopolymers is narrowly in the range of 31-34 °C, while PNIPAM-b-P2VP diblock copolymers at pH = 7 and 2 have broad LCSTs of 25-40 °C and 41-50 °C, respectively; iii) SANS results show that only the PNIPAM-b-P2VP solution at pH = 7 and 50 °C (both blocks are hydrophobic) has a sphere form factor with diameter of about 110 nm.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer Testing - Volume 65, February 2018, Pages 97-102
Journal: Polymer Testing - Volume 65, February 2018, Pages 97-102
نویسندگان
Dong Liu, Chengsha Wei, Guanyun Yan, Guangai Sun,