Physics Help Forum Radius of Gyration of an H-polymer?
 User Name Remember Me? Password

 General Physics General Physics Help Forum

 Sep 29th 2019, 08:29 AM #1 Junior Member   Join Date: Sep 2019 Posts: 1 Radius of Gyration of an H-polymer? Hello, I've been struggling with determining the radius of gyration of an H-polymer. Show that the radius of gyration of an ideal H-polymer with all five sections containing an equal number (N/5) of Kuhn monomers of length b is: $\displaystyle (R_g)^2 = (Nb^2/6)(89/625)$ I know the definition of the radius of gyration, but I've been having a difficult time deducing this particular equation from there. Any help is appreciated.
 Sep 30th 2019, 04:01 AM #2 Senior Member   Join Date: Oct 2017 Location: Glasgow Posts: 474 I don't know anything about physical chemistry, but it seems to me that there is a specific equation for the radius of gyration for a polymer based on the square of the distance between each point in the polymer chain and the centre of mass of the chain: $\displaystyle ^2 = \frac{1}{N} \sum_{i=1}^{N} (R_i - R_{cm})^2$ So, perhaps you can draw the basic structure of a H-polymer with 5 sections and calculate this summation for each point on the polymer from its centre of mass? topsquark likes this.

 Thread Tools Display Modes Linear Mode

 Similar Physics Forum Discussions Thread Thread Starter Forum Replies Last Post Nousher Kinematics and Dynamics 1 Jan 19th 2015 09:19 AM Garvil Periodic and Circular Motion 2 Feb 14th 2013 11:42 AM mikewhant Kinematics and Dynamics 2 Jan 18th 2010 06:45 AM hriday Advanced Optics 1 May 3rd 2009 09:30 AM JOHNH Advanced Mechanics 6 Oct 31st 2008 12:43 PM