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Molecular motion in poly(β-benzyl-L-aspartate)

✍ Scribed by F. Happey; D. W. Jones; B. M. Watsox

Publisher
Wiley (John Wiley & Sons)
Year
1971
Tongue
English
Weight
494 KB
Volume
10
Category
Article
ISSN
0006-3525

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✦ Synopsis

As the t,emperatiire of solid poly(&benzyl-L-aspart.ate) (PRLA), (CO . N H . C H .-CH2COOCHrCsH,),, in the a-helical form is raised froml.iO"C, the line width and second moment of the proton magnetic resonance (PMR ) sigiial decrease in stages riiitil the conformational transition to the w-helix occurs a t about 90°C. A similar temperature dependence of the PAIR parameters is observed as the t,ransformed polymer is cooled. Below -100°C (where the lattice is presumed to be rigid), the measured secmd moments are 9.5 OeZ and 10.7 OeZ for the a and w forms, respectively. Second moments, calculated from the Van Vleck formula for the rigid lattice and also estimated for possible mot.iorial cases in which t,he polymer is taken to be in the w form, are compared wit.h the PAIR data. By combinat.ion with t.he resri1t.s of X-ray diffraction and infrared spectroscopic measiirement,s, a t,eiitat.ive explanation can be made of the types of motioii occurring in PBLA.

30. 79

@ 1071 by John Wiley (e: Sons, h r .

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