Introduction
Tennis is one of the most elegant and athletic sports that there is. The game that we know and love today has been evolving since the early 1800’s. The rules regarding the racquets that are allowed in today’s professional field were not established until 1981. Prior to this set of rules everything from a gloved hand to a wooden bat was used in place of the racquet. Every aspect of tennis, from the court surface to the shoes on a player’s feet affects the way a match is played. A tennis racquet makes each player unique. In fact, most professional players have racquets made to their own personal specifications. As a tennis player myself, I can attest to the importance of a well-made racquet that matches my style of play. I chose to explore the chemistry of a tennis racquet because I was interested to learn how the the different parts of a racquet affect the level of play on the court. My greatest passion in life is the game of tennis. If it was up to me, I would eat, sleep and breathe the game of tennis. Tennis continues to keep me active, fit and happy!Composition of ...
Main Chemicals, Compounds, Components
(carbon fiber: pure carbon; graphitic structure)
Chemistry's Role
Carbon Fiber (Racquet Frame)
Although Carbon fiber is one of the most abundant elements on the planet, making carbon fiber is an extensive process that involves many chemical reactions. The process begins with the precursor polyacrylonitrile (C3H3N)n . The precursor is made of Acrylonitrile (C3H3N) and Methyl Acrylate (CH2CHCO2CH3) which are both monomers. The monomers are mixed together in powder form and then mechanically agitated (stirred) in water. The agitation causes the powder to coagulate and it creates the polymer polyacrylonitrile. Once the polymer (which is also the precursor) is created, it is heated to molten temperature and shot through a get into a chemical bath. (unfortunately, the specific chemicals used are considered proprietary) The chemical causes the plastic to form into a long fiber. Then it is stretched to allow the molecules to align themselves parallel to the axis of the fiber which gives the fiber its strength. Next the fibers are heated (390 - 590°F) in the air. The polymer attracts oxygen from the air and the molecular structure is redesigned into a more thermally stable ladder structure. Next the fibers are carbonized. The fibers move through a series of ovens that have no oxygen present and as the heat increases (1,839 - 5,500°F) the fiber expels the hydrogen and nitrogen out. What is left are chains of pure carbon that link, twist and fold together, giving the carbon fiber its strength. Now the fibers need to be immersed into carbon dioxide, air or ozone in order to coat the outside of the fiber with oxygen so that it bonds more easily with other materials. Finally several thousand fibers are twisted together to make a yarn and then sized with a glue-like material that will prevent damage to the fibers when they are packaged.
Natural Gut: (Strings)
Surprisingly, there is not very much chemistry involved in the process of making natural gut strings. The strings are made from a membrane that comes out of a cow’s gut, called the serous membrane. When the membrane has been removed from the cow, it is cut into strips. Those strips are then slowly and gently washed in order to remove impurities without damaging. Sometimes the membrane is bleached during the washing process. Bleach whitens by destroying a group of atoms, called chromophores, that let of a specific wavelength that humans see as color. Then the strips of membrane are dried over several days in an environmentally controlled room that ensures consistency. When the strips are dry, they can be dyed a different color, if desired. Dye works by attacking chromophores with a group of atoms called auxochromes. The auxochromes attach themselves to the chromophores and alter the wavelength that the chromophores give off so that humans perceive a different color. Next the strips are bound together while tension is being applied. However, when the strings are formed, the edges are rough and need to be smoothed. Once the strings are polished, they are tested to make sure that they meet the required specifications and then they are packaged and sent around the world to be sold.
Background Research
Resources
https://sites.google.com/a/isd77.k12.mn.us/crappy-chem/
Introduction to how chemistry relates to tennis
Racquet materials and the benefits of the materials used today
Most common racquet materials
https://trishalee34.wordpress.com/2013/11/19/the-chemistry-of-tennis-2/
Basics information on the materials, chemicals and elements that are used in a tennis raquet, ball, court, string and grip
Titanium, graphite, carbon fiber and sometimes tungsten are used in the more expensive racquets
Less expensive racquets are made of Aluminum and Carbon Fiber
https://www.youtube.com/watch?v=sgV2DMstyPo
Video about Wilson engineers and how they design and make their racquets
The racquet frame is mainly carbon fiber (range of average to expensive), fiberglass, kevlar, basalt fibers
http://www.tennisexpress.com/info/wilson-blx-racquet-tennis-technology.cfm
How basalt fibers are inserted into the BLX Wilson racquet and why
superior to other materials
other information is listed under “basalt fibers”
http://www.madehow.com/Volume-3/Tennis-Racket.html
Information on the history of tennis and general facts about the game
All information from this site is listed under “Background Research”
https://www.youtube.com/watch?v=JMBqPbLrZMA
Video that looks at Head designs and how they make their racquets.
https://www.youtube.com/watch?v=DUkAxvZq__I
What grips are made of
the over grip is made of rubber (some textured, some smooth)
the replacement grip is two parts: a rubber underlayer and a cotton fiber cushion over the top.
http://www.livestrong.com/article/276131-materials-used-make-tennis-racket/
Good information on grip, string and racquet materials as well as information about the game in general.
http://www.tenniscompanion.org/parts-of-a-tennis-racquet/
Information on how different parts of a racquet affect the play of the game and how to choose the right one for yourself.
information is listed under “Background Research”
The differences between a power racquet, control racquet and power-control racquet.
http://zoltek.com/carbonfiber/how-is-it-made/
The process of making carbon fiber.
https://en.wikipedia.org/wiki/Polyacrylonitrile
Information is listed under “The Composition of Tennis Racquets”
http://www.chm.bris.ac.uk/webprojects2002/edwards/chemistry.htm
Information is listed under “The Composition of Tennis Racquets”
https://en.wikipedia.org/wiki/Carbon_fibers
Information on carbon fibers
http://www.tennis.com/gear/2013/02/question-day-revisiting-spaghetti-racquet/46306/#.Vog-2ELt7sA
Explains what “spaghetti stringing” is and how it is different from a racquet that is strung the standard way
https://en.wikipedia.org/wiki/Strings_(tennis)
Information on the different materials used to make strings
http://www.tennis-warehouse.com/LC/Naturalgut.html
Explains what natural gut is and how it is used
Information listed under “Main Chemicals, Components and Compounds”
http://www.compositesworld.com/articles/the-making-of-carbon-fiber
Information on how Carbon fibers are made
All information listed under “Chemistry’s Role”
http://www.enzymestuff.com/digestion.htm
The enzymes that work inside our guts and what they do
All Information listed under “Chemistry’s Role”
http://www.chemistryexplained.com/Ar-Bo/Bleaches.html
The chemistry behind bleach
Information under “Chemistry’s Role”
http://www.chemistryexplained.com/Di-Fa/Dyes.html
The chemistry behind dyes
Information under “Chemistry’s Role”
http://www.madehow.com/Volume-4/Carbon-Fiber.html
Basic information about making carbon fiber
http://web.mit.edu/3.082/www/team2_f01/chemistry.html
The molecular structure of carbon fiber precursor and how it changes as it becomes carbon fiber
About the Author
Stephanie Beal is a junior at Billings Senior High School who spends her free time (when the weather allows) playing tennis. Stephanie’s love for tennis started when she was nine years old. She also enjoys playing and going on walks with her great dane, Moose. Stephanie plans on going to college and pursuing some form of design.