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ÍФÃÔÅÔ¡¾ÅÒʵԡà»ç¹¾ÅÒʵԡ·Õèä´é¨Ò¡¡ÒùÓâÁâ¹àÁÍÃì¢Í§àÁ·ÔÅàÁ·Òä¤Ãàŵ (methyl methacrylate, MMA) ÁÒ·Ó»¯Ô¡ÔÃÔÂÒ¡ÒÃà¡Ô´â¾ÅÔàÁÍÃì (polymerization) â´Â 2 ¹Ñ¡à¤ÁÕªÒÇàÂÍÃÁѹ¤×Í ¿Ô··Ô¨ (Fittig) áÅоÍÅ (Paul) ÊÒÁÒöÊѧà¤ÃÒÐËìâ¾ÅÔàÁ·ÔÅàÁ·Òä¤Ãàŵä´éµÑé§áµè»Õ ¤.È. 1877 áÅéÇ áµè¡ÒþѲ¹ÒÇÔ¸Õ¼ÅÔµãËéä´éá¼è¹ÍФÃÔÅÔ¡¾ÅÒʵԡÍÍ¡ÁÒµéͧÃͶ֧»Õ ¤.È. 1933 àÁ×èÍÍÍ·â· àÃÔËìÁ (Otto RÖhm) ¹Ñ¡à¤ÁÕªÒÇàÂÍÃÁѹ¢Í¨´ÊÔ·¸ÔºÑµÃÇÔ¸Õ¼ÅÔµá¼è¹¾ÅÒʵԡãʨҡâ¾ÅÔàÁ·ÔÅàÁ·Òä¤Ãàŵ㹪×èÍ·Ò§¡ÒäéÒ Plexiglasÿ ËÅѧ¨Ò¡¹Ñé¹ã¹»Õ ¤.È. 1936 ¨Ö§ÁÕ¡ÒüÅÔµá¼è¹ Plexiglas ÍÍ¡¨Ó˹èÒÂã¹àªÔ§¾Ò³ÔªÂì ÿÿÿÿÿÿÿÿ ´éǤÇÒÁ¡éÒÇ˹éÒ·Ò§ÇÔ·ÂÒÈÒʵÃìáÅÐà·¤â¹âÅÂÕ »Ñ¨¨ØºÑ¹ÊÒÁÒö¼ÅÔµÍФÃÔÅÔ¡¾ÅÒʵԡä´é¨Ò¡»¯Ô¡ÔÃÔÂÒ¡ÒÃà¡Ô´â¾ÅÔàÁÍÃìËÅÒÂẺ àªè¹ ¡ÒÃà¡Ô´â¾ÅÔàÁÍÃìẺÍÕÁÑŪѹ (emulsion polymerization) ¡ÒÃà¡Ô´â¾ÅÔàÁÍÃìẺºÑÅ¡ì (bulk polymerization) à»ç¹µé¹ ¡ÒüÅÔµÍФÃÔÅÔ¡¾ÅÒʵԡẺ “á¼è¹” ÁÑ¡ãªéà·¤¹Ô¤¡ÒÃà¡Ô´â¾ÅÔàÁÍÃìẺºÑÅ¡ì â´ÂàµÔÁâÁâ¹àÁÍÃì¢Í§àÁ·ÔÅàÁ·Òä¤Ãàŵ¡ÑºµÑÇàÃè§»¯Ô¡ÔÃÔÂÒŧã¹áÁè¾ÔÁ¾ì (mold) ¾ÃéÍÁ¡Ñ¹ ÊÁºÑµÔ·Õè¹èÒʹ㨢ͧÍФÃÔÅÔ¡¾ÅÒʵԡ 1.ÁÕ¤ÇÒÁ˹Òá¹è¹»ÃÐÁÒ³ 1.15-1.19 ¡ÃÑÁ/ÅÙ¡ºÒÈ¡ìૹµÔàÁµÃ 2.ÁըشËÅÍÁàËÅÇ·ÕèÍØ³ËÀÙÁÔ 130-140 ͧÈÒà«Åà«ÕÂÊ áÅШشà´×Í´·ÕèÍØ³ËÀÙÁÔ 200 ͧÈÒà«Åà«ÕÂÊ 3.ÁÕ¤ÇÒÁ·¹·Ò¹µèÍ¡ÒáÃÐá·¡ (impact strength) ÊÙ§¡ÇèÒá¡éÇáÅÐâ¾ÅÔÊäµÃÕ¹ áµèµèÓ¡ÇèÒâ¾ÅÔ¤ÒÃìºÍ๵áÅоÅÒʵԡÇÔÈÇ¡ÃÃÁª¹Ô´Í×è¹ 4.ÍФÃÔÅÔ¡¾ÅÒʵԡÁÕà¹×éÍÍè͹¨Ö§à¡Ô´ÃÍ¢ٴ¢Õ´ä´é§èÒ 5.áʧÊÇèÒ§ÊÒÁÒöÊèͧ¼èÒ¹à¹×é;ÅÒʵԡä´é¶Ö§ÃéÍÂÅÐ 92 áÅÐÁÕ¡ÒÃÊзé͹¡ÅѺ·Õè¼ÔÇ»ÃÐÁÒ³ÃéÍÂÅÐ 4 6.ÁÕ¤ÇÒÁ·¹·Ò¹µèÍÊÀÒ¾áÇ´ÅéÍÁ´Õ¡ÇèÒ¾ÅÒʵԡª¹Ô´Í×è¹àªè¹ â¾ÅÔ¤ÒÃìºÍ๵ ¨Ö§¹ÔÂÁãªéÍФÃÔÅÔ¡¾ÅÒʵԡ¡Ñº§Ò¹¡ÅÒ§á¨é§´éÇ 7.ÍФÃÔÅÔ¡¾ÅÒʵԡäÁè·¹·Ò¹µè͵ÑÇ·ÓÅÐÅÒÂËÅÒª¹Ô´ ¡ÒüÅÔµá¼è¹ÍФÃÔÅÔ¡¾ÅÒʵԡ·Óä´é 2 Ẻ ¤×Í 1.¡ÒüÅÔµà»ç¹ªØ´ (Batch cell bulk polymerization) ÁÕ¢Ñ鹵͹¡ÒüÅÔµ´Ñ§¹Õé 1).¡ÒüÅÔµá¼è¹¾ÅÒʵԡ¨ÐãªéáÁè¾ÔÁ¾ìà»ç¹á¼è¹á¡éÇËÃ×Íá¼è¹âÅËмÔÇàÃÕº 2 á¼è¹»ÃСºà¢éÒ´éÇ¡ѹ â´Â¢Íº¹Í¡áÁè¾ÔÁ¾ìÁÕÅѡɳÐà»ç¹¡Ãͺ˹ҷÕèÂ×´Ë´ä´é ·Ñé§¹Õéà¹×èͧ¨Ò¡ÇèÒã¹ÃÐËÇèÒ§¡ÒÃà¡Ô´â¾ÅÔàÁÍÃì àÁ×èÍâÁâ¹àÁÍÃìËÃ×ÍâÁàÅ¡ØÅàÅç¡ËÅÒµÑÇÁÒàª×èÍÁ¡Ñ¹à¢éÒ¡ÅÒÂà»ç¹âÁàÅ¡ØÅãËè¨Ð·ÓãËé»ÃÔÁÒµÃÊÒÃŴŧ ´Ñ§¹Ñ鹡ÃͺáÁè¾ÔÁ¾ì¨Ö§µéͧ˴µÑǵÒÁ»ÃÔÁҵþÅÒʵԡ·Õèà»ÅÕèÂ¹ä» 2).âÁâ¹àÁÍÃìàËÅǢͧàÁ·ÔÅàÁ·Òä¤Ãàŵ¡ÑºµÑÇàÃè§»¯Ô¡ÔÃÔÂÒ¶Ù¡»ÅèÍÂà¢éÒä»ã¹áÁè¾ÔÁ¾ì ºÒ§¤ÃÑé§ÍÒ¨àµÔÁ¾ÃÕâ¾ÅÔàÁÍÃì (prepolymer) 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http://en.wikipedia.org/wiki/Acrylic_glass http://www.madehow.com/Volume-2/Acrylic-Plastic.html http://www.wisegeek.com/what-is-the-difference-between-acrylic-and-glass-aquariums.htm http://pslc.ws/macrog/kidsmac/pmma.htm http://en.wikipedia.org/wiki/Okinawa_Churaumi_Aquarium Paper Size Standard Paper Sizes U.S. Name
A (letter)
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B (ledger)
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C
D
E | U.S. Size
8.5 x 11 inches
8.5 x 14 inches
11 x 17 inches
13 x 19 inches
17 x 22 inches
22 x 34 inches
34 x 44 inches | Metric Equivalent
216 x 279 mm
216 x 356 mm
279 x 432 mm
330 x 483 mm
432 x 559 mm
559 x 864 mm
864 x 1118 mm |  | Metric Name
A5
A4
A3
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A2
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A0 | Metric Size
148 x 210 mm
210 x 297 mm
297 x 420 mm
329 x 483 mm
420 x 594 mm
594 x 841 mm
841 x 1189 mm | U.S. Equivalent
5.8 x 8.3 inches
8.3 x 11.7 inches
11.7 x 16.5 inches
13 x 19 inches
16.5 x 23.4 inches
23.4 x 33.1 inches
33.1 x 46.8 inches | |
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