پیوندزنی سطح یک نوع الیاف نایلونی با استفاده از مخلوط دو مونومر اکریلیک و بهینه‌سازی پارامترهای مربوطه توسط یک نرم‌افزار متداول طراحی آزمایش

نوع مقاله : مقاله پژوهشی

نویسندگان

• محمد خسروی
• سعید استاد موحد

فردوسی مشهد

10.22067/fum-mech.v31i1.84217

چکیده

زیست رسوب‌گذاری دریایی به تجمعی از انواع ارگانیسم‌ها برسازه‌های فرورفته در آب دریا گفته می‌شود. این پدیده اثرات مخربی بر سازه‌های شناور در آب مانند کشتی‌ها، قفس‌های پرورش ماهی و غیره دارد. به‌منظور کاهش رسوب‌گذاری زیستی بر روی الیاف یک نوع نایلون، مخلوط دو مونومر اکریلیک، 2 - هیدروکسی اتیل متاکریلات و متیل آکریلات به روش پیش‌تابش و در شرایط مختلف بر روی الیاف فوق پیوند زده شد. سپس پارامترهای درصد پیوندزنی و درصد هومو-کو پلیمر با تغییر متغیرهای عملیاتی مانند دمای واکنش (℃۹۰-۶۰)، زمان واکنش h) ۴-۱)، زمان پیش‌تابش min) ۴۰-۱۰) و غلظت آغازگر (۹-۳%)  اندازه‌گیری شده و با مقادیر محاسبه شده توسط  یک نرم‌افزار متداول طراحی آزمایش (®Design-expert) مقایسه گردیده و نتایج مورد بحث قرار گرفتند. جهت بهینه‌سازی نتایج توسط نرم‌افزار و بررسی اثر متقابل متغیرهای فوق جهت پیش‌بینی پارامترهای مذکور، از روش پاسخ سطح و طراحی نقاط مرکزی با استفاده از ۴ متغیر و ۲ سطح پاسخ استفاده شد. افزایش زمان تابش و غلظت آغازگر باعث افزایش درصد پیوندزنی به دلیل افزایش مراکز فعّال بر سطح الیاف شدند. به کمک تحلیل جدول آنالیز واریانس و مقدار متغیر p-valuee با بازه اطمینان ۰۵/۰، پارامترهای مهم در مدل به ترتیب اهمّیّت، دمای واکنش، زمان واکنش، زمان پیش‌تابش و غلظت آغازگر تشخیص داده شدند. همچنین صحت آماری نتایج به‌دست‌آمده به کمک مقادیر متغیرهای آماری مانند ضریب مشخصه‌سازی ( ۹۶٪)، ضریب مشخص‌سازی تنظیم شده (۹۳٪) و تناسب دقّت (۳۰۲/۳۰) مورد تأیید قرار گرفتند. در شرایط بهینه معرفی شده توسط نرم‌افزار، مقادیر پیش‌بینی‌شده توسط مدل پیشنهادی نرم‌افزار عبارت بودند از درصد پیوندزنی، ۵۹/۳۸ و هومووکوپلیمر ۴۲/۴۳ در صد که با مقادیر تجربی به ترتیب ۸۹/۳۷ و ۹۸/۴۲ درصد تطابق مناسبی داشتند. همچنین دو معادله جهت پیش‌بینی مقادیر پارامترها با تغییر متغیرهای مورد مطالعه توسط نرم‌افزار ارائه گردیدند.

کلیدواژه‌ها

• الیاف نایلون
• 2- هیدروکسی اتیل متاکریلات
• متیل آکریلات
• درصد پیوندزنی
• طراحی آزمایش

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عنوان مقاله [English]

The Grafting of a Nylon Fiber Surface by a Mixture of Two Acrylic Monomers and the Evaluation of Optimum Values by using a Traditional Design of Experiment Software

نویسندگان [English]

• Mohammad Khosravi
• Saeed Ostad Movahed

چکیده [English]

Bio-fouling as a worldwide marine industries concern is the accumulation of micro and macro-organisms on the submersed surfaces in the sea water. It has destructive effects on the sunk parts of the ships, fish cages and all other marine submersed structures. To reduce bio-fouling on the nylon fibers a dual mix of 2-Hydroxy ethyl methacrylate(HEMA) and methyl acrylate(MA) was grafted on the fiber surface using a pre-irradiation technique in different conditions. Subsequently, degree of grafting and homo and or co-polymer % of the aforementioned monomers at different operative parameters including reaction temperatures (60-90℃), and times (1-4h), pre-irradiation time (10-40min) and also initiator concentration (3-9wt%) were measured and the results were compared and discussed with those calculated values by a traditional design of experiment software (Design expert®). The optimum grafting conditions and the interaction between above mentioned parameters were evaluated by the software using four variables and two surface responses with central point design method. It found that increasing pre-irradiation time and also initiator concentration improved the grafting % of the monomers on the fiber surface. The reason referred to increasing the active sites on the fiber surface after pre-irradiation. With the aid of variance analysis and considering p-values variable with 0.05 confidence interval, it revealed that the important parameters lied down in the order of reaction temperature, reaction time, pre-irradiation time and initiator concentration. Also, the results were confirmed statistically by the characteristic coefficient, adjustment coefficient and fit precision of 96%,93% and 30.302, respectively. The real values for degree of grafting and also homo and co-polymer percent were 47.9% and 41.15% respectively. They were in conformity with predicted values by mathematical model with the values of 38.59 and 43.42%. Also, two equations were proposed by the software for calculation of the aforementioned parameters with studied operative parameters.

کلیدواژه‌ها [English]

• Nylon Fibers
• 2-Hydroxy Ethyl Methacrylate
• Methyl Acrylate
• Grafting percent (%)
• Design of Experiment

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